K. Khlifi, H. Dhiflaoui, Chokri Ben Aissa, N. Barhoumi, A. Larbi
{"title":"Friction and Wear Behavior of a Physical Vapor Deposition Coating Studied Using a Micro-Scratch Technique","authors":"K. Khlifi, H. Dhiflaoui, Chokri Ben Aissa, N. Barhoumi, A. Larbi","doi":"10.1115/1.4052239","DOIUrl":"https://doi.org/10.1115/1.4052239","url":null,"abstract":"","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":"71 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88484012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Effect of Multipoles on the Elasto-Plastic Properties of a Crystal: Theory and Three-Dimensional Dislocation Dynamics Modeling","authors":"A. Siddique, Hojun Lim, T. Khraishi","doi":"10.1115/1.4052168","DOIUrl":"https://doi.org/10.1115/1.4052168","url":null,"abstract":"","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75669744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The diffusion of hydrogen in metals is of interest due to the deleterious influence of hydrogen on material ductility and fracture resistance. It is becoming increasingly clear that hydrogen transport couples significantly with dislocation activity. In this work, we use a coupled diffusion-crystal plasticity model to incorporate hydrogen transport associated with dislocation sweeping and pipe diffusion in addition to standard lattice diffusion. Moreover, we consider generation of vacancies via plastic deformation and stabilization of vacancies via trapping of hydrogen. The proposed hydrogen transport model is implemented in a physically based crystal viscoplasticity framework to model the interaction of dislocation substructure and hydrogen migration. In this study, focus is placed on hydrogen transport and trapping within the intense deformation field of a crack tip plastic zone. We discuss the implications of the model results in terms of constitutive relations that incorporate hydrogen effects on crack tip field behavior and enable exploration of hydrogen embrittlement mechanisms.
{"title":"Modeling Dislocation-Mediated Hydrogen Transport and Trapping in Face-Centered Cubic Metals","authors":"Theodore Zirkle, L. Costello, T. Zhu, D. McDowell","doi":"10.1115/1.4051147","DOIUrl":"https://doi.org/10.1115/1.4051147","url":null,"abstract":"The diffusion of hydrogen in metals is of interest due to the deleterious influence of hydrogen on material ductility and fracture resistance. It is becoming increasingly clear that hydrogen transport couples significantly with dislocation activity. In this work, we use a coupled diffusion-crystal plasticity model to incorporate hydrogen transport associated with dislocation sweeping and pipe diffusion in addition to standard lattice diffusion. Moreover, we consider generation of vacancies via plastic deformation and stabilization of vacancies via trapping of hydrogen. The proposed hydrogen transport model is implemented in a physically based crystal viscoplasticity framework to model the interaction of dislocation substructure and hydrogen migration. In this study, focus is placed on hydrogen transport and trapping within the intense deformation field of a crack tip plastic zone. We discuss the implications of the model results in terms of constitutive relations that incorporate hydrogen effects on crack tip field behavior and enable exploration of hydrogen embrittlement mechanisms.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63502351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The residual effect of thermally and mechanically loaded polyurea samples was investigated in this study using terahertz time-domain spectroscopy (THz-TDS), operating in the transmission mode. Samples of different thicknesses were submerged in liquid nitrogen and reached cryogenic isothermal condition before equilibrating at room temperature. Another set of samples were extracted from quasi-statically loaded strips. All samples were then interrogated using THz-TDS since terahertz waves exhibit nonionizing interactions with polymers, eliminating the need for any post-loading preparatory steps of the samples. The time-domain terahertz signals were used to extract the optical and electrical properties as a function of sample thickness and loading conditions. The residual effect was prominent in the mechanically loaded samples compared to a nearly negligible presence in thermally loaded ones. On average, the thermally loaded polyurea results were subtle compared to the results of the unloaded samples, whereas samples that were mechanically stretched showed a considerable difference. Spectral analysis reported the frequency-dependent, complex refractive index of virgin and loaded polyurea as a function of thickness and spectral peaks associated with fundamental vibrational modes of the polyurea structure. The spectral peaks were in good agreement with previous research while elucidating the residual effect via the disappearance of three peaks in the low terahertz regime for mechanically loaded samples. In general, the refractive index was dependent on the loading conditions. Terahertz spectroscopy was shown to be a promising tool for future in situ and in operando investigations of field-dependent polymer responses.
{"title":"Ex-situ Spectroscopic Characterization of Residual Effects of Thermomechanical Loading on Polyurea","authors":"N. Huynh, G. Youssef","doi":"10.1115/1.4053349","DOIUrl":"https://doi.org/10.1115/1.4053349","url":null,"abstract":"\u0000 The residual effect of thermally and mechanically loaded polyurea samples was investigated in this study using terahertz time-domain spectroscopy (THz-TDS), operating in the transmission mode. Samples of different thicknesses were submerged in liquid nitrogen and reached cryogenic isothermal condition before equilibrating at room temperature. Another set of samples were extracted from quasi-statically loaded strips. All samples were then interrogated using THz-TDS since terahertz waves exhibit nonionizing interactions with polymers, eliminating the need for any post-loading preparatory steps of the samples. The time-domain terahertz signals were used to extract the optical and electrical properties as a function of sample thickness and loading conditions. The residual effect was prominent in the mechanically loaded samples compared to a nearly negligible presence in thermally loaded ones. On average, the thermally loaded polyurea results were subtle compared to the results of the unloaded samples, whereas samples that were mechanically stretched showed a considerable difference. Spectral analysis reported the frequency-dependent, complex refractive index of virgin and loaded polyurea as a function of thickness and spectral peaks associated with fundamental vibrational modes of the polyurea structure. The spectral peaks were in good agreement with previous research while elucidating the residual effect via the disappearance of three peaks in the low terahertz regime for mechanically loaded samples. In general, the refractive index was dependent on the loading conditions. Terahertz spectroscopy was shown to be a promising tool for future in situ and in operando investigations of field-dependent polymer responses.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47684929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Muhammad Ali Ablat, A. Alafaghani, Jian-Qiao Sun, A. Qattawi
Origami-based sheet metal (OSM) bending uses the origami concept to form a three-dimensional (3D) structures from a two-dimensional (2D) sheet by a series of bending operation. The OSM bending relies on a material discontinuity (MD) to perform the bending operation where the MDs are subjected to tension and shear load. Even though the OSM bending is a process that is simple, cost-effective, and easy to integrate into mass production, the understanding of the OSM bending mechanics is limiting its wide application. Particularly, the deformation behavior of MDs under tension and shear load remains unknown. Hence, this work investigates the response of MDs to these loads using the standard tension and shear tests. From the tests, critical values for two different ductile fracture criteria (DFC) are determined, and the possibility of a failure occurring in OSM bending is predicted. Results show that the load-bearing capability of the MDs is related to change in the effective cross-section area of a MD. Simple tension and shear tests can provide a simple procedure to predict failure in OSM bending. The impact of self-contact occurred under shear load influences maximum shear force and accuracy of failure prediction.
{"title":"Experimental Evaluation of Tension and Shear Responses of Material Discontinuities in Origami-Based Sheet Metal Bending","authors":"Muhammad Ali Ablat, A. Alafaghani, Jian-Qiao Sun, A. Qattawi","doi":"10.1115/1.4053145","DOIUrl":"https://doi.org/10.1115/1.4053145","url":null,"abstract":"\u0000 Origami-based sheet metal (OSM) bending uses the origami concept to form a three-dimensional (3D) structures from a two-dimensional (2D) sheet by a series of bending operation. The OSM bending relies on a material discontinuity (MD) to perform the bending operation where the MDs are subjected to tension and shear load. Even though the OSM bending is a process that is simple, cost-effective, and easy to integrate into mass production, the understanding of the OSM bending mechanics is limiting its wide application. Particularly, the deformation behavior of MDs under tension and shear load remains unknown. Hence, this work investigates the response of MDs to these loads using the standard tension and shear tests. From the tests, critical values for two different ductile fracture criteria (DFC) are determined, and the possibility of a failure occurring in OSM bending is predicted. Results show that the load-bearing capability of the MDs is related to change in the effective cross-section area of a MD. Simple tension and shear tests can provide a simple procedure to predict failure in OSM bending. The impact of self-contact occurred under shear load influences maximum shear force and accuracy of failure prediction.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46950057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Matsuda, Aref Samadi-Dooki, Yinjie Cen, Gisela Vazquez, Luke Bu
Polymer coatings are widely used in industrial applications. The mechanical properties of these polymer coatings are known to vary with temperature and deformation rate. The characterization of the dynamic mechanical properties of these coatings at high temperatures via traditional uniaxial testing is challenging due often to their brittleness and small size. In this paper, the mechanical properties of polymer coatings are reported with emphasis on their dynamic mechanical properties at temperatures up to 280 °C characterized by a dynamic nanoindentation technique with a sharp indenter tip. Nanoindentation was used to characterize the mechanical response with emphasis on dynamic mechanical properties of polymer coatings enclosed in a high-temperature stage. To verify the method, the viscoelastic properties of a reference PET were also characterized by uniaxial cyclic tensile testing which exhibited an excellent agreement with the proposed technique. The proposed nanoindentation method can be applied to other polymer coatings and thin films that are used in applications at high temperatures.
{"title":"High Temperature Dynamic Mechanical Properties Characterization of Polymer Coatings via Nanoindentation","authors":"Y. Matsuda, Aref Samadi-Dooki, Yinjie Cen, Gisela Vazquez, Luke Bu","doi":"10.1115/1.4053029","DOIUrl":"https://doi.org/10.1115/1.4053029","url":null,"abstract":"Polymer coatings are widely used in industrial applications. The mechanical properties of these polymer coatings are known to vary with temperature and deformation rate. The characterization of the dynamic mechanical properties of these coatings at high temperatures via traditional uniaxial testing is challenging due often to their brittleness and small size. In this paper, the mechanical properties of polymer coatings are reported with emphasis on their dynamic mechanical properties at temperatures up to 280 °C characterized by a dynamic nanoindentation technique with a sharp indenter tip. Nanoindentation was used to characterize the mechanical response with emphasis on dynamic mechanical properties of polymer coatings enclosed in a high-temperature stage. To verify the method, the viscoelastic properties of a reference PET were also characterized by uniaxial cyclic tensile testing which exhibited an excellent agreement with the proposed technique. The proposed nanoindentation method can be applied to other polymer coatings and thin films that are used in applications at high temperatures.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41360907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chellappa Karunakaran, Alagappan Ponnalagu, K. Kannan, K. Rajagopal
We study the initiation of damage in a polymeric body in which there is a line defect due to the formation of a “weld line” that occurs when two polymer streams join together and then solidify. We show that damage initiates in the region of weakness, namely the “weld line” based on a criterion for damage that was developed earlier in [1]. We also show that if there are other stress concentrators also additionally present, such as a hole, then there is a competition between the stresses induced due to the weakness and the stress as a consequence of the stress concentrator (in this instance a hole). This study adds more credence to the criterion for the initiation of damage that is based completely on knowledge of information at the current configuration of the body, that is, the criterion for damage is not based on the value of quantities that also need information based on a reference configuration such as the stress or strain.
{"title":"Prediction of the Onset of Failure in Elastomeric Solids with Weld Lines being Represented as Localized Regions of Lower Density","authors":"Chellappa Karunakaran, Alagappan Ponnalagu, K. Kannan, K. Rajagopal","doi":"10.1115/1.4052923","DOIUrl":"https://doi.org/10.1115/1.4052923","url":null,"abstract":"\u0000 We study the initiation of damage in a polymeric body in which there is a line defect due to the formation of a “weld line” that occurs when two polymer streams join together and then solidify. We show that damage initiates in the region of weakness, namely the “weld line” based on a criterion for damage that was developed earlier in [1]. We also show that if there are other stress concentrators also additionally present, such as a hole, then there is a competition between the stresses induced due to the weakness and the stress as a consequence of the stress concentrator (in this instance a hole). This study adds more credence to the criterion for the initiation of damage that is based completely on knowledge of information at the current configuration of the body, that is, the criterion for damage is not based on the value of quantities that also need information based on a reference configuration such as the stress or strain.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46634279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Obielodan, Maia Delwiche, D. Clark, Cassie Downing, Delanie Huntoon, Tsunghsueh Wu
This work investigates the differences in mechanical and thermal properties of polylactic acid (PLA)/lignin biocomposites made of four different unmodified organosolv lignin materials, three of which were extracted from different woody biomass (maple, oak, and pine) in-house, and one sourced commercially. Filaments made from blends of 30wt% and 40wt% of the in-house lignin and the commercially sourced lignin as fillers in PLA were used to 3D-print experimental test samples using fused filament fabrication (FFF) process. Statistically significant differences were observed in the mechanical properties based on tension testing and Izod impact testing, while differences in thermal properties based on differential scanning calorimetry (DSC) and thermogravimetric (TGA) analysis were less significant. Test samples with 30wt% lignin had tensile strengths that were higher than those of 40wt% lignin. Among the three in-house extracted lignin from the woody biomass resources, maple-based composites consistently yielded the highest tensile strengths while oak-based materials yielded the highest stiffness in tension testing and the most stability in impact resistance. The pine-based materials showed the most decline in strengths between 30wt% and 40wt% lignin loadings. The commercially obtained lignin at 30wt% and pine-based lignin at 40wt% yielded much higher percent elongations at failure than all other materials. This study demonstrates the influence of lignin biomass resources and their concentrations on the properties and performances of 3D printed specimens.
{"title":"Comparing the Mechanical and Thermal Properties of PLA/Organosolv Lignin Biocomposites Made of Different Biomass for 3D Printing Applications","authors":"J. Obielodan, Maia Delwiche, D. Clark, Cassie Downing, Delanie Huntoon, Tsunghsueh Wu","doi":"10.1115/1.4052922","DOIUrl":"https://doi.org/10.1115/1.4052922","url":null,"abstract":"\u0000 This work investigates the differences in mechanical and thermal properties of polylactic acid (PLA)/lignin biocomposites made of four different unmodified organosolv lignin materials, three of which were extracted from different woody biomass (maple, oak, and pine) in-house, and one sourced commercially. Filaments made from blends of 30wt% and 40wt% of the in-house lignin and the commercially sourced lignin as fillers in PLA were used to 3D-print experimental test samples using fused filament fabrication (FFF) process. Statistically significant differences were observed in the mechanical properties based on tension testing and Izod impact testing, while differences in thermal properties based on differential scanning calorimetry (DSC) and thermogravimetric (TGA) analysis were less significant. Test samples with 30wt% lignin had tensile strengths that were higher than those of 40wt% lignin. Among the three in-house extracted lignin from the woody biomass resources, maple-based composites consistently yielded the highest tensile strengths while oak-based materials yielded the highest stiffness in tension testing and the most stability in impact resistance. The pine-based materials showed the most decline in strengths between 30wt% and 40wt% lignin loadings. The commercially obtained lignin at 30wt% and pine-based lignin at 40wt% yielded much higher percent elongations at failure than all other materials. This study demonstrates the influence of lignin biomass resources and their concentrations on the properties and performances of 3D printed specimens.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48193693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Very high temperature reactors (VHTRs) are planned to be operated between 550 to 950°C, and demand a thermally efficient intermediate heat exchanger (IHX) in the heat transport system (HTS). The current technological development of compact heat exchangers (CHXs) for VHTRs is at the ‘proof of concept’ level. A significant development in the CHX technologies is essential for the VHTRs to be efficient, cost-effective, and safe. CHXs have very high thermal efficiency and compactness, making them a prime candidate for IHXs in VHTRs. Photochemically etched plates with the desired channel pattern are stacked and diffusion bonded to fabricate CHXs. All plates are compressed at an elevated temperature over a specified period in the diffusion bonding process, promoting atomic diffusion and grain growth across bond surfaces resulting in a monolithic block. The diffusion bonding process changes the base metal properties, which are unknown for Alloy 800H, a candidate alloy for CHX construction. Hence, developing mechanical response data and understanding failure mechanisms of diffusion bonded Alloy 800H at elevated temperatures is a key step for advancing the technology of IHXs in VHTRs. The ultimate goal of this study is to develop ASME BPVC Section III, Division 5 design rules for CHXs in nuclear service. Towards this goal, mechanical performance and microstructures of diffusion bonded Alloy 800H is investigated through a series of tensile, fatigue, creep, and creep-fatigue tests at temperatures 550 to 760°C. The test results, failure mechanisms, and microstructures of diffusion bonded Alloy 800H is scrutinized and presented.
超高温反应堆(vhtr)计划在550至950°C之间运行，并且在传热系统(HTS)中需要一个热效率高的中间热交换器(IHX)。目前用于vhtr的紧凑型热交换器(chx)的技术发展处于“概念验证”水平。CHX技术的重大发展对于vhtr的效率、成本效益和安全性至关重要。chx具有非常高的热效率和紧凑性，使其成为vhtr中ihx的主要候选材料。光化学蚀刻板与所需的通道模式是堆叠和扩散键合，以制造chx。在扩散键合过程中，所有的板在指定的时间内在高温下被压缩，促进原子扩散和晶粒在键合表面的生长，从而形成一个整体块。扩散连接过程改变了基体金属的性能，而对于CHX结构的候选合金Alloy 800H来说，这是未知的。因此，研究扩散键合合金800H在高温下的力学响应数据，了解扩散键合合金800H在高温下的失效机理，是推进高温高温堆IHXs技术的关键一步。本研究的最终目标是为核服务中的chx制定ASME BPVC Section III, Division 5设计规则。为此，在550 ~ 760℃的温度下，通过一系列拉伸、疲劳、蠕变和蠕变疲劳试验，研究了扩散结合合金800H的力学性能和显微组织。详细介绍了扩散焊合金800H的试验结果、失效机理和微观组织。
{"title":"Mechanical And Microstructural Performance Evaluation Of Diffusion Bonded Alloy 800H For Very High Temperature Nuclear Service","authors":"Heramb P. Mahajan, L. Maciel, T. Hassan","doi":"10.1115/1.4052825","DOIUrl":"https://doi.org/10.1115/1.4052825","url":null,"abstract":"\u0000 Very high temperature reactors (VHTRs) are planned to be operated between 550 to 950°C, and demand a thermally efficient intermediate heat exchanger (IHX) in the heat transport system (HTS). The current technological development of compact heat exchangers (CHXs) for VHTRs is at the ‘proof of concept’ level. A significant development in the CHX technologies is essential for the VHTRs to be efficient, cost-effective, and safe. CHXs have very high thermal efficiency and compactness, making them a prime candidate for IHXs in VHTRs. Photochemically etched plates with the desired channel pattern are stacked and diffusion bonded to fabricate CHXs. All plates are compressed at an elevated temperature over a specified period in the diffusion bonding process, promoting atomic diffusion and grain growth across bond surfaces resulting in a monolithic block. The diffusion bonding process changes the base metal properties, which are unknown for Alloy 800H, a candidate alloy for CHX construction. Hence, developing mechanical response data and understanding failure mechanisms of diffusion bonded Alloy 800H at elevated temperatures is a key step for advancing the technology of IHXs in VHTRs. The ultimate goal of this study is to develop ASME BPVC Section III, Division 5 design rules for CHXs in nuclear service. Towards this goal, mechanical performance and microstructures of diffusion bonded Alloy 800H is investigated through a series of tensile, fatigue, creep, and creep-fatigue tests at temperatures 550 to 760°C. The test results, failure mechanisms, and microstructures of diffusion bonded Alloy 800H is scrutinized and presented.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42411691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. A. Abd-El-Nabey, M. Ashour, A. M. Aly, M. E. Mohamed
Superhydrophobic films were successfully grafted on a steel substrate using potentiostatic electrodeposition of nickel followed by treatment with myristic acid (MA). A scanning electron microscope (SEM) was used to investigate the surface topography of the prepared superhydrophobic films. The results revealed that the prepared Ni films modified by myristic acid have micro-nano structures. FTIR and XRD measurements showed that the steel substrate was coated with nickel film modified with myristic acid. Three different nickel films were prepared; the Ni-MA (I) deposited from pure sulfate bath (1.0 M NiSO4), Ni-MA (II) deposited from pure nickel chloride bath (1.0 M NiCl2. 6H2O), and the third Ni-MA (III) film deposited from Watts bath (0.2M NiCl2. 6H2O and 0.8M NiSO4). The superhydrophobic Ni-MA (I) film has the highest corrosion resistance, chemical stability, and mechanical abrasion resistance, while Ni-MA (II) film has the lowest properties.
采用恒电位电沉积镍，再用肉豆酱酸(MA)处理，成功地将超疏水薄膜接枝到钢基体上。利用扫描电子显微镜(SEM)对制备的超疏水膜的表面形貌进行了研究。结果表明，用肉豆酱酸修饰制备的Ni薄膜具有微纳结构。红外光谱(FTIR)和x射线衍射(XRD)测试表明，钢基体上包覆了一层肉豆酱酸改性的镍膜。制备了三种不同的镍膜;纯硫酸浴(1.0 M NiSO4)沉积的Ni-MA (I)，纯氯化镍浴(1.0 M NiCl2)沉积的Ni-MA (II)。6H2O)和第三层Ni-MA (III)薄膜(0.2M NiCl2)。6H2O和0.8M NiSO4)。超疏水Ni-MA (I)膜具有最高的耐腐蚀性、化学稳定性和机械耐磨性，而Ni-MA (II)膜具有最低的性能。
{"title":"Fabrication of Robust Superhydrophobic Nickel Films on Steel Surface with High Corrosion Resistance, Mechanical and Chemical Stability","authors":"B. A. Abd-El-Nabey, M. Ashour, A. M. Aly, M. E. Mohamed","doi":"10.1115/1.4052768","DOIUrl":"https://doi.org/10.1115/1.4052768","url":null,"abstract":"\u0000 Superhydrophobic films were successfully grafted on a steel substrate using potentiostatic electrodeposition of nickel followed by treatment with myristic acid (MA). A scanning electron microscope (SEM) was used to investigate the surface topography of the prepared superhydrophobic films. The results revealed that the prepared Ni films modified by myristic acid have micro-nano structures. FTIR and XRD measurements showed that the steel substrate was coated with nickel film modified with myristic acid. Three different nickel films were prepared; the Ni-MA (I) deposited from pure sulfate bath (1.0 M NiSO4), Ni-MA (II) deposited from pure nickel chloride bath (1.0 M NiCl2. 6H2O), and the third Ni-MA (III) film deposited from Watts bath (0.2M NiCl2. 6H2O and 0.8M NiSO4). The superhydrophobic Ni-MA (I) film has the highest corrosion resistance, chemical stability, and mechanical abrasion resistance, while Ni-MA (II) film has the lowest properties.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42150521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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