Pub Date : 2024-10-01DOI: 10.1016/j.corsci.2024.112491
Agustin Salcedo , Stefano Caputo , Sophie Loehlé , Stephan N. Steinmann , Carine Michel
Ammonia is emerging as a carbon-free fuel but its corrosive effect on metal engine components, particularly those made of copper and copper alloys, is a major concern to be addressed. Herein, typical corrosion inhibitors are investigated in the presence of NH3. They have been ranked experimentally based on their corrosion initiation time while the NH3 diffusion barrier through inhibitor films has been evaluated using molecular dynamics simulations using a classical force field that was tuned to improve the Cu/inhibitor interactions. The excellent agreement with experiments indicates that this simulation approach could allow for the screening of new corrosion inhibitors.
{"title":"Molecular modeling of the diffusion of ammonia through corrosion inhibitor films on copper","authors":"Agustin Salcedo , Stefano Caputo , Sophie Loehlé , Stephan N. Steinmann , Carine Michel","doi":"10.1016/j.corsci.2024.112491","DOIUrl":"10.1016/j.corsci.2024.112491","url":null,"abstract":"<div><div>Ammonia is emerging as a carbon-free fuel but its corrosive effect on metal engine components, particularly those made of copper and copper alloys, is a major concern to be addressed. Herein, typical corrosion inhibitors are investigated in the presence of NH<sub>3</sub>. They have been ranked experimentally based on their corrosion initiation time while the NH<sub>3</sub> diffusion barrier through inhibitor films has been evaluated using molecular dynamics simulations using a classical force field that was tuned to improve the Cu/inhibitor interactions. The excellent agreement with experiments indicates that this simulation approach could allow for the screening of new corrosion inhibitors.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112491"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.corsci.2024.112496
A.E. Yaedu , L. Volpe , A. Shaik , F. Long , K. Daub , F. Scenini , S.Y. Persaud
Alloy X-750 was exposed to a 480 °C CO-CO2 reducing gas mixture at an oxygen partial pressure below the NiO dissociation pressure. Post-exposure analytical transmission electron microscopy (ATEM) analysis confirmed the occurrence of preferential intergranular oxidation (PIO) and internal oxidation which resulted in the formation of Ni nodules. Thus, reducing CO-CO2 mixtures can promote PIO in Alloy X-750, similar to Alloy 600 exposed to similar oxygen partial pressure but in H2-steam environment. In Alloy X-750, intergranular oxidation of Ti and Al were observed to occur prior to Cr oxidation, while the presence of intergranular Cr carbides hinders PIO penetration depth.
合金 X-750 暴露于 480 °C CO-CO2 还原气体混合物中，氧分压低于氧化镍解离压。暴露后的分析透射电子显微镜（ATEM）分析证实发生了优先晶间氧化（PIO）和内部氧化，从而形成了镍结核。因此，还原 CO-CO2 混合物可促进合金 X-750 中的 PIO，这与合金 600 暴露于类似氧分压但在 H2 蒸汽环境中的情况类似。在合金 X-750 中，观察到 Ti 和 Al 的晶间氧化发生在 Cr 氧化之前，而 Cr 晶间碳化物的存在阻碍了 PIO 的渗透深度。
{"title":"Understanding preferential intergranular oxidation in alloy X-750 in 480 °C CO-CO2 environments at the nanoscale","authors":"A.E. Yaedu , L. Volpe , A. Shaik , F. Long , K. Daub , F. Scenini , S.Y. Persaud","doi":"10.1016/j.corsci.2024.112496","DOIUrl":"10.1016/j.corsci.2024.112496","url":null,"abstract":"<div><div>Alloy X-750 was exposed to a 480 °C CO-CO<sub>2</sub> reducing gas mixture at an oxygen partial pressure below the NiO dissociation pressure. Post-exposure analytical transmission electron microscopy (ATEM) analysis confirmed the occurrence of preferential intergranular oxidation (PIO) and internal oxidation which resulted in the formation of Ni nodules. Thus, reducing CO-CO<sub>2</sub> mixtures can promote PIO in Alloy X-750, similar to Alloy 600 exposed to similar oxygen partial pressure but in H<sub>2</sub>-steam environment. In Alloy X-750, intergranular oxidation of Ti and Al were observed to occur prior to Cr oxidation, while the presence of intergranular Cr carbides hinders PIO penetration depth.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112496"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-30DOI: 10.1016/j.corsci.2024.112493
Hongyu Ma , Yu Cui , Rui Liu , Peiling Ke , Fuhui Wang , Li Liu
Graphite-like carbon (GLC) coating is a candidate protection coating for corrosion-wear resistance of materials surface in deep-sea environments. The mechanics-electrochemistry coupling failure mechanism and the corrosion-wear interaction failure of coatings have been an urgent problem that needs to be solved. In this paper, the corrosion-wear failure behaviour of multilayer Cr/GLC coating during static corrosion-tribocorrosion alternating cycles at 0.1 MPa and 15 MPa was investigated by electrochemical impedance spectroscopy (EIS), polarization curves and scanning electron microscope (SEM). The results show that the corrosion-wear morphology of multilayer Cr/GLC coating under high pressure and tribocorrosion coupling is more severe than that at atmospheric pressure, and the coating's corrosion resistance and wear resistance significantly decreased. High hydrostatic pressure amplifies the corrosive effect in the corrosion-wear interaction, accelerating purely mechanical wear and corrosion-accelerated wear processes of coatings. The action mechanism of complex mechanics and complex electrochemistry on the corrosion-wear failure of multilayer Cr/GLC coating is discussed.
{"title":"Investigation of the corrosion-wear failure mechanism of multilayer Cr/GLC coatings under hydrostatic pressure-tribocorrosion alternation","authors":"Hongyu Ma , Yu Cui , Rui Liu , Peiling Ke , Fuhui Wang , Li Liu","doi":"10.1016/j.corsci.2024.112493","DOIUrl":"10.1016/j.corsci.2024.112493","url":null,"abstract":"<div><div>Graphite-like carbon (GLC) coating is a candidate protection coating for corrosion-wear resistance of materials surface in deep-sea environments. The mechanics-electrochemistry coupling failure mechanism and the corrosion-wear interaction failure of coatings have been an urgent problem that needs to be solved. In this paper, the corrosion-wear failure behaviour of multilayer Cr/GLC coating during static corrosion-tribocorrosion alternating cycles at 0.1 MPa and 15 MPa was investigated by electrochemical impedance spectroscopy (EIS), polarization curves and scanning electron microscope (SEM). The results show that the corrosion-wear morphology of multilayer Cr/GLC coating under high pressure and tribocorrosion coupling is more severe than that at atmospheric pressure, and the coating's corrosion resistance and wear resistance significantly decreased. High hydrostatic pressure amplifies the corrosive effect in the corrosion-wear interaction, accelerating purely mechanical wear and corrosion-accelerated wear processes of coatings. The action mechanism of complex mechanics and complex electrochemistry on the corrosion-wear failure of multilayer Cr/GLC coating is discussed.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112493"},"PeriodicalIF":7.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.corsci.2024.112482
Shihao Zhang , Shengkai Wang , Juan Hou , Wei Wang , Jiang Li , En-Hou Han , Wenjun Kuang
This study investigated the microstructure effects on the stress corrosion cracking (SCC) initiation behavior of laser powder-bed-fusion (L-PBF) printed 304 L stainless steel in high-temperature hydrogenated water. The dislocation cells facilitate Cr transportation, thereby mitigating intergranular oxidation and SCC initiation. Compared to the warm-rolled dislocation cells, as-printed dislocation cells result in reduced strain localization, which is beneficial for suppressing SCC initiation. This is because the as-printed dislocation cells are stable and composed of abundant screw dislocations. Micro-inclusions can lead to nodular corrosion, thus increasing the depth of intergranular oxidation and promoting SCC initiation.
本研究探讨了激光粉末床熔融（L-PBF）印刷 304 L 不锈钢在高温氢化水中的微观结构对应力腐蚀开裂（SCC）引发行为的影响。位错电池促进了铬的迁移，从而减轻了晶间氧化和 SCC 的引发。与热轧差排单元相比，压印差排单元减少了应变定位，有利于抑制 SCC 的发生。这是因为压印差排单元是稳定的，由大量的螺旋差排组成。微夹杂物会导致结节腐蚀，从而增加晶间氧化深度，促进 SCC 的形成。
{"title":"Determining the microstructure effects on the stress corrosion cracking initiation behavior of laser powder-bed-fusion printed 304L stainless steel in high-temperature hydrogenated water","authors":"Shihao Zhang , Shengkai Wang , Juan Hou , Wei Wang , Jiang Li , En-Hou Han , Wenjun Kuang","doi":"10.1016/j.corsci.2024.112482","DOIUrl":"10.1016/j.corsci.2024.112482","url":null,"abstract":"<div><div>This study investigated the microstructure effects on the stress corrosion cracking (SCC) initiation behavior of laser powder-bed-fusion (L-PBF) printed 304 L stainless steel in high-temperature hydrogenated water. The dislocation cells facilitate Cr transportation, thereby mitigating intergranular oxidation and SCC initiation. Compared to the warm-rolled dislocation cells, as-printed dislocation cells result in reduced strain localization, which is beneficial for suppressing SCC initiation. This is because the as-printed dislocation cells are stable and composed of abundant screw dislocations. Micro-inclusions can lead to nodular corrosion, thus increasing the depth of intergranular oxidation and promoting SCC initiation.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112482"},"PeriodicalIF":7.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.corsci.2024.112485
Ujjval Bansal , Neelamegan Esakkiraja , Thangaraj Baskaran , Tanaji Paul , Raju Ravi , Praveen Kumar , Vikram Jayaram , Aloke Paul
This study shows the beneficial effect of Pt addition to the (β+γ)-NiCrAlY coating. Adding Y in NiCrAl increases oxide growth kinetics but improves spallation resistance. Pt with Y does not change the oxidation rate compared to only adding Y but significantly reduces spallation when cooled to room temperature. Continuous layers of Al2O3 and Cr2O3, along with other oxides such as YAlO3, NiCr2O4, and NiAl2O4, are observed. Moreover, Pt addition reduces the thickness of the interdiffusion zone where Al goes through an uphill diffusion profile, minimizing Al loss and significantly decreasing the growth of deleterious TCP phases.
这项研究显示了在 (β+γ)-NiCrAlY 涂层中添加铂的有益效果。在镍铬铝中添加 Y 会增加氧化物的生长动力学，但会提高抗剥落性。与只添加 Y 相比，添加 Y 的 Pt 不会改变氧化率，但在冷却到室温时会显著减少剥落。可观察到连续的 Al2O3 和 Cr2O3 层以及其他氧化物，如 YAlO3、NiCr2O4 和 NiAl2O4。此外，铂的加入还减少了相互扩散区的厚度，在这一区域中，铝通过上坡扩散，从而最大限度地减少了铝的损失，并显著降低了有害 TCP 相的生长。
{"title":"Synergistic effects of Pt and Y addition in (Ni, Pt)CrAlY bond coat on oxide spallation resistance and growth of interdiffusion zone between bond coat and Ni-based single crystal superalloy","authors":"Ujjval Bansal , Neelamegan Esakkiraja , Thangaraj Baskaran , Tanaji Paul , Raju Ravi , Praveen Kumar , Vikram Jayaram , Aloke Paul","doi":"10.1016/j.corsci.2024.112485","DOIUrl":"10.1016/j.corsci.2024.112485","url":null,"abstract":"<div><div>This study shows the beneficial effect of Pt addition to the (β+γ)-NiCrAlY coating. Adding Y in NiCrAl increases oxide growth kinetics but improves spallation resistance. Pt with Y does not change the oxidation rate compared to only adding Y but significantly reduces spallation when cooled to room temperature. Continuous layers of Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub>, along with other oxides such as YAlO<sub>3</sub>, NiCr<sub>2</sub>O<sub>4</sub>, and NiAl<sub>2</sub>O<sub>4,</sub> are observed. Moreover, Pt addition reduces the thickness of the interdiffusion zone where Al goes through an uphill diffusion profile, minimizing Al loss and significantly decreasing the growth of deleterious TCP phases.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112485"},"PeriodicalIF":7.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.corsci.2024.112489
Chaewon Jeong , Byeong Seo Kong , Junjie Chen , Qian Xiao , Changheui Jang
The effect of austenite morphology on the corrosion resistance of a newly-developed advanced duplex stainless steel (ADCS) was evaluated by electrochemical and chloride-induced stress corrosion cracking (CISCC) tests. By properly controlling heat treatment conditions, equiaxed (EQ) and elongated (EL) austenites were formed in ferrite matrix. ADCS-EQ exhibited higher pitting potential than ADCS-EL, primarily owing to less phase boundary. Meanwhile, ADCS-EL showed better CISCC resistance than ADCS-EQ, as the elongated austenite inhibited selective dissolution. Overall, the CISCC resistance of ADCS was more affected by austenite morphology and orientation, and would not be in accordance with pitting corrosion resistance.
{"title":"The effect of microstructure of an advanced duplex stainless steel on the pitting corrosion and chloride-induced stress corrosion cracking resistance","authors":"Chaewon Jeong , Byeong Seo Kong , Junjie Chen , Qian Xiao , Changheui Jang","doi":"10.1016/j.corsci.2024.112489","DOIUrl":"10.1016/j.corsci.2024.112489","url":null,"abstract":"<div><div>The effect of austenite morphology on the corrosion resistance of a newly-developed advanced duplex stainless steel (ADCS) was evaluated by electrochemical and chloride-induced stress corrosion cracking (CISCC) tests. By properly controlling heat treatment conditions, equiaxed (EQ) and elongated (EL) austenites were formed in ferrite matrix. ADCS-EQ exhibited higher pitting potential than ADCS-EL, primarily owing to less phase boundary. Meanwhile, ADCS-EL showed better CISCC resistance than ADCS-EQ, as the elongated austenite inhibited selective dissolution. Overall, the CISCC resistance of ADCS was more affected by austenite morphology and orientation, and would not be in accordance with pitting corrosion resistance.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112489"},"PeriodicalIF":7.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.corsci.2024.112488
Ming Shu , Shuo Cong , Qin Zhou , Xianglong Guo , Qiyin Zhou , Yongduo Sun , Songling Wu
The oxide scale of 20Cr25Ni2.5Al AFA alloy formed under the coupling of stress and supercritical carbon dioxide (sCO2, 650 ℃ / 15 MPa) consisted of Fe3O4, Cr2O3, preferential intergranular oxidation zones, but lacked a thin Al2O3 protective layer. The poor oxidation resistance resulted in significant CO2 penetration into the matrix and subsequent formation of Cr2O3, thereby hindering the initiation of Cr - rich σ phase beneath the oxide scale. This competition between oxidation and precipitation effectively reduced crack initiation and delayed the connection between SCC and creep cracks, thus significantly prolonging the creep lifetime in sCO2 compared to that in air.
{"title":"Unraveling the SCC behavior and enhanced creep strength mechanism of AFA alloy in supercritical CO2","authors":"Ming Shu , Shuo Cong , Qin Zhou , Xianglong Guo , Qiyin Zhou , Yongduo Sun , Songling Wu","doi":"10.1016/j.corsci.2024.112488","DOIUrl":"10.1016/j.corsci.2024.112488","url":null,"abstract":"<div><div>The oxide scale of 20Cr25Ni2.5Al AFA alloy formed under the coupling of stress and supercritical carbon dioxide (sCO<sub>2</sub>, 650 ℃ / 15 MPa) consisted of Fe<sub>3</sub>O<sub>4</sub>, Cr<sub>2</sub>O<sub>3</sub>, preferential intergranular oxidation zones, but lacked a thin Al<sub>2</sub>O<sub>3</sub> protective layer. The poor oxidation resistance resulted in significant CO<sub>2</sub> penetration into the matrix and subsequent formation of Cr<sub>2</sub>O<sub>3</sub>, thereby hindering the initiation of Cr - rich σ phase beneath the oxide scale. This competition between oxidation and precipitation effectively reduced crack initiation and delayed the connection between SCC and creep cracks, thus significantly prolonging the creep lifetime in sCO<sub>2</sub> compared to that in air.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112488"},"PeriodicalIF":7.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.corsci.2024.112490
Chuang Qiao , Hongyang Zhang , Fengjing Wu , Shuzhen Qiao , Chunli Dai , Xian Zhang , Meng Sun , Bo-Kai Liao , Yong Shen , Long Hao , Yunxiang Chen , Jianqiu Wang , Wei Ke
Rare earth (RE) has been demonstrated to have a series of positive effects on performance of bearing steel. In this study, we propose a new mechanism that RE element can enhance the corrosion resistance of bearing steel under atmospheric condition by promoting the formation of a thicker surface oxide film with a greater thickness in the inner protective layer which consists of Fe3O4 and Cr2O3. Such an evolution is primarily associated with the dissolved RE element in steel matrix. Besides, EIS data regression can provide a way to quantify the corrosion resistance evolution in surface oxide film on steel substrates.
稀土（RE）已被证明对轴承钢的性能有一系列积极影响。在这项研究中，我们提出了一种新的机制，即稀土元素可以通过促进由 Fe3O4 和 Cr2O3 组成的内保护层形成厚度更大的表面氧化膜，从而增强轴承钢在大气条件下的耐腐蚀性。这种演变主要与钢基体中溶解的 RE 元素有关。此外，EIS 数据回归可以提供一种量化钢基体表面氧化膜耐腐蚀性演变的方法。
{"title":"Rare earth addition powered corrosion resistance of the surface oxide film on GCr15 bearing steel substrate","authors":"Chuang Qiao , Hongyang Zhang , Fengjing Wu , Shuzhen Qiao , Chunli Dai , Xian Zhang , Meng Sun , Bo-Kai Liao , Yong Shen , Long Hao , Yunxiang Chen , Jianqiu Wang , Wei Ke","doi":"10.1016/j.corsci.2024.112490","DOIUrl":"10.1016/j.corsci.2024.112490","url":null,"abstract":"<div><div>Rare earth (RE) has been demonstrated to have a series of positive effects on performance of bearing steel. In this study, we propose a new mechanism that RE element can enhance the corrosion resistance of bearing steel under atmospheric condition by promoting the formation of a thicker surface oxide film with a greater thickness in the inner protective layer which consists of Fe<sub>3</sub>O<sub>4</sub> and Cr<sub>2</sub>O<sub>3</sub>. Such an evolution is primarily associated with the dissolved RE element in steel matrix. Besides, EIS data regression can provide a way to quantify the corrosion resistance evolution in surface oxide film on steel substrates.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112490"},"PeriodicalIF":7.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.corsci.2024.112487
Hongjun Li , Ming Huang , Yuan Qin , Lin Hong , Sen Yang
This study systematically compared the oxidation and creep characteristics of T91 steel in both martensitic and ferritic states. Findings indicate the formation of mixed oxides, including Fe3O4, (Cr, Mn)2O3, and MnCr2O4, during the oxidation process. In the ferritic specimens, the oxygen diffusion channel is restricted due to the transition of M23C6 carbide. Moreover, the ferritic steel exhibits poor creep life, and a strong α fibre texture was observed. For T91 steel, appropriate thermomechanical treatment can lead to uniform distribution of M23C6 carbides within the matrix, achieving the optimal precipitation strengthening effect and resulting in improved high-temperature properties.
{"title":"New insights into oxidation and creep characteristics of T91 heat-resistant steel in martensitic and ferritic states","authors":"Hongjun Li , Ming Huang , Yuan Qin , Lin Hong , Sen Yang","doi":"10.1016/j.corsci.2024.112487","DOIUrl":"10.1016/j.corsci.2024.112487","url":null,"abstract":"<div><div>This study systematically compared the oxidation and creep characteristics of T91 steel in both martensitic and ferritic states. Findings indicate the formation of mixed oxides, including Fe<sub>3</sub>O<sub>4</sub>, (Cr, Mn)<sub>2</sub>O<sub>3</sub>, and MnCr<sub>2</sub>O<sub>4</sub>, during the oxidation process. In the ferritic specimens, the oxygen diffusion channel is restricted due to the transition of M<sub>23</sub>C<sub>6</sub> carbide. Moreover, the ferritic steel exhibits poor creep life, and a strong α fibre texture was observed. For T91 steel, appropriate thermomechanical treatment can lead to uniform distribution of M<sub>23</sub>C<sub>6</sub> carbides within the matrix, achieving the optimal precipitation strengthening effect and resulting in improved high-temperature properties.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112487"},"PeriodicalIF":7.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.corsci.2024.112481
Jinyao Ma , Shucai Zhang , Huabing Li , Huanyu Tan , Hao Feng , Puli Wang , Yi Zhang , Peide Han , Zhihua Wang
The effect of boron (B) addition coupled with 500 ℃ pre-aging on the corrosion resistance of S31254 was systematically investigated. The results suggested that the diffusion of Mo to grain boundaries (GBs) played a crucial role in enhancing intergranular corrosion resistance. Additionally, the addition of B further promoted the uniform distribution of Mo during the pre-aging process by suppressing Mo segregation at GB. Ultimate, the B microalloying coupled with the pre-aging strategy optimized the composition of passive film through promoting the formation of Mo-rich passivation film, which significantly enhanced the corrosion resistance of Mo-containing stainless steel.
{"title":"Corrosion resistance enhancement for 6Mo austenitic stainless steel through B alloying coupled with a simple pre-aging method","authors":"Jinyao Ma , Shucai Zhang , Huabing Li , Huanyu Tan , Hao Feng , Puli Wang , Yi Zhang , Peide Han , Zhihua Wang","doi":"10.1016/j.corsci.2024.112481","DOIUrl":"10.1016/j.corsci.2024.112481","url":null,"abstract":"<div><div>The effect of boron (B) addition coupled with 500 ℃ pre-aging on the corrosion resistance of S31254 was systematically investigated. The results suggested that the diffusion of Mo to grain boundaries (GBs) played a crucial role in enhancing intergranular corrosion resistance. Additionally, the addition of B further promoted the uniform distribution of Mo during the pre-aging process by suppressing Mo segregation at GB. Ultimate, the B microalloying coupled with the pre-aging strategy optimized the composition of passive film through promoting the formation of Mo-rich passivation film, which significantly enhanced the corrosion resistance of Mo-containing stainless steel.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"240 ","pages":"Article 112481"},"PeriodicalIF":7.4,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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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