Pub Date : 2022-07-12DOI: 10.1080/00325899.2022.2096194
A. Holmberg, U. Wiklund, P. Isaksson, Å. Kassman Rudolphi
ABSTRACT In the present study, crack propagation through the case hardened region of two different PM steels manufactured with different powder size distributions and sintered at different temperatures has been investigated. EBSD was used to study the microstructure before and after case hardening, revealing the relationship between powder particle grains after sintering and prior austenite grains after case hardening. A novel approach was used to achieve short cracks (10–20 µm) with high repeatability. The cracks were then analysed using EBSD and SEM, revealing detailed and novel information about the crack propagation route in the materials. Both tested materials show the same crack propagation behaviour. If a prior grain/prior austenite boundary is present within an angle from the crack initiation site, the cracks will follow the boundary and thus propagate intergranular, suggesting that the preferred route of crack propagation in case hardened sintered steel is along these boundaries.
{"title":"Crack initiation and early propagation in case hardened sintered PM steels under cyclic load","authors":"A. Holmberg, U. Wiklund, P. Isaksson, Å. Kassman Rudolphi","doi":"10.1080/00325899.2022.2096194","DOIUrl":"https://doi.org/10.1080/00325899.2022.2096194","url":null,"abstract":"ABSTRACT In the present study, crack propagation through the case hardened region of two different PM steels manufactured with different powder size distributions and sintered at different temperatures has been investigated. EBSD was used to study the microstructure before and after case hardening, revealing the relationship between powder particle grains after sintering and prior austenite grains after case hardening. A novel approach was used to achieve short cracks (10–20 µm) with high repeatability. The cracks were then analysed using EBSD and SEM, revealing detailed and novel information about the crack propagation route in the materials. Both tested materials show the same crack propagation behaviour. If a prior grain/prior austenite boundary is present within an angle from the crack initiation site, the cracks will follow the boundary and thus propagate intergranular, suggesting that the preferred route of crack propagation in case hardened sintered steel is along these boundaries.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41597611","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}
Pub Date : 2022-05-31DOI: 10.1080/00325899.2022.2069076
Masoud Moradjoy, H. Khorsand
ABSTRACT The present work deals with the metal injection moulding and ultra-high temperature sintering of 17-4 PH powder. Purposefully, 5 mass% ZrO2 particles were dispersed by applying high shear stress during feedstock preparation. Uniformly distributed particles effectively hindered the powder boundary migration and limited their growth during ultra-high sintering temperatures. The achieved thermal stability provided a proper condition for reducing the final porosity to 3% and significantly improved the ultimate strength to 1070 MPa after sintering at 1380°C. Also, the ZrO2 particles acted as facilitators of sliding between solid powders and substantially reduced the required pressure for injecting to 700 Bar. Through introducing such a new approach in the field of powder injection moulding by ZrO2 particles, the amount of anisotropic shrinkage was reduced to 2%.
{"title":"Growth inhibiting during ultra-high temperature sintering of injection moulded 17-4 PH stainless steel through the dispersion of ZrO2 particle as a thermal stabiliser","authors":"Masoud Moradjoy, H. Khorsand","doi":"10.1080/00325899.2022.2069076","DOIUrl":"https://doi.org/10.1080/00325899.2022.2069076","url":null,"abstract":"ABSTRACT The present work deals with the metal injection moulding and ultra-high temperature sintering of 17-4 PH powder. Purposefully, 5 mass% ZrO2 particles were dispersed by applying high shear stress during feedstock preparation. Uniformly distributed particles effectively hindered the powder boundary migration and limited their growth during ultra-high sintering temperatures. The achieved thermal stability provided a proper condition for reducing the final porosity to 3% and significantly improved the ultimate strength to 1070 MPa after sintering at 1380°C. Also, the ZrO2 particles acted as facilitators of sliding between solid powders and substantially reduced the required pressure for injecting to 700 Bar. Through introducing such a new approach in the field of powder injection moulding by ZrO2 particles, the amount of anisotropic shrinkage was reduced to 2%.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43429300","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}
ABSTRACT In this study, phosphorus-containing Fe-5 wt.% Si silicon steel sheet was prepared by powder loose sintering followed by hot rolling. Defect-free sheet with high P content was achieved. The study found that P effects on sintering promotion and processing deterioration were significantly suppressed by the presence of Si in steel. Appropriate P content would significantly improve the mechanical and magnetic properties of the sample. Under a comprehensive consideration, P content of 0.3-0.5 wt.% was suitable for silicon steel. Compared with P-free silicon steel, with 0.3 wt.% P addition, the tensile strength of silicon steel increased from 521 MPa to 680 MPa. As to the magnetic performance, the sample with 0.5 wt.% P had B8 of 1370.5 mT, and W10/50 0f 1.16 W·kg−1, while those for P-free sample were 1332.3 mT, and 1.46 W·kg−1, respectively. FeP phase with special morphology would be precipitated in samples with P addition.
{"title":"Performance improvement and microstructure evolution of powder metallurgy high silicon steel with phosphorus addition","authors":"Q. Qin, Fang Yang, Cun-guang Chen, Junjie Hao, Zhimeng Guo","doi":"10.1080/00325899.2022.2080156","DOIUrl":"https://doi.org/10.1080/00325899.2022.2080156","url":null,"abstract":"ABSTRACT In this study, phosphorus-containing Fe-5 wt.% Si silicon steel sheet was prepared by powder loose sintering followed by hot rolling. Defect-free sheet with high P content was achieved. The study found that P effects on sintering promotion and processing deterioration were significantly suppressed by the presence of Si in steel. Appropriate P content would significantly improve the mechanical and magnetic properties of the sample. Under a comprehensive consideration, P content of 0.3-0.5 wt.% was suitable for silicon steel. Compared with P-free silicon steel, with 0.3 wt.% P addition, the tensile strength of silicon steel increased from 521 MPa to 680 MPa. As to the magnetic performance, the sample with 0.5 wt.% P had B8 of 1370.5 mT, and W10/50 0f 1.16 W·kg−1, while those for P-free sample were 1332.3 mT, and 1.46 W·kg−1, respectively. FeP phase with special morphology would be precipitated in samples with P addition.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48504069","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}
Pub Date : 2022-05-26DOI: 10.1080/00325899.2022.2080157
Shih-Hsien Chang, C. Chang, K. Huang
ABSTRACT This research added different ratios of chromium carbides, tantalum carbide, and titanium carbide powders to Vanadis 23 high-speed steel powders. The composite powders utilised vacuum sintering at 1230, 1245, 1260, and 1275°C for 1 h, respectively, and the experimental results show that good mechanical properties were obtained by the addition of 0.6 mass% Cr3C2–0.2 mass% TaC–0.2 mass% TiC sintered at 1245°C for 1 h. Meanwhile, the apparent porosity was decreased to 0.23%, and the transverse rupture strength and hardness reached 2470.7 MPa and 78.5 HRA, respectively. When optimally sintered Vanadis 23 composites (0.2 T) underwent a series of heat treatments, the transverse rupture strength and hardness values were obviously enhanced to 2693.6 MPa and 84.0 HRA after quenching, and sub-zero and tempering treatments. The EBSD and TEM results confirm that the MC, M 6C, M 7C3, and M 23C6-type carbides appeared in the 0.2 T specimen after vacuum sintering and sub-zero heat treatments.
{"title":"In situ TEM observation of the microstructure characteristics of the vacuum sintering, sub-zero and heat treatments of Vanadis 23 high-speed steel by adding Cr3C2–TaC–TiC powders","authors":"Shih-Hsien Chang, C. Chang, K. Huang","doi":"10.1080/00325899.2022.2080157","DOIUrl":"https://doi.org/10.1080/00325899.2022.2080157","url":null,"abstract":"ABSTRACT This research added different ratios of chromium carbides, tantalum carbide, and titanium carbide powders to Vanadis 23 high-speed steel powders. The composite powders utilised vacuum sintering at 1230, 1245, 1260, and 1275°C for 1 h, respectively, and the experimental results show that good mechanical properties were obtained by the addition of 0.6 mass% Cr3C2–0.2 mass% TaC–0.2 mass% TiC sintered at 1245°C for 1 h. Meanwhile, the apparent porosity was decreased to 0.23%, and the transverse rupture strength and hardness reached 2470.7 MPa and 78.5 HRA, respectively. When optimally sintered Vanadis 23 composites (0.2 T) underwent a series of heat treatments, the transverse rupture strength and hardness values were obviously enhanced to 2693.6 MPa and 84.0 HRA after quenching, and sub-zero and tempering treatments. The EBSD and TEM results confirm that the MC, M 6C, M 7C3, and M 23C6-type carbides appeared in the 0.2 T specimen after vacuum sintering and sub-zero heat treatments.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48540164","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}
Pub Date : 2022-05-23DOI: 10.1080/00325899.2022.2079183
Mahammad Ali Shaik, Brahma Raju Golla
ABSTRACT In the present work, the effect of Al content (0, 3, 5, 10, 15 wt-%) on the microstructure, mechanical and wear properties of Cu was systematically studied. Interestingly, the core–shell microstructure was observed in the Cu–Al alloys or Al bronzes with different layers of α-Cu, and intermetallic phases. The Cu–Al alloys displayed good compressive yield strength of 174–653 MPa, in particular, the Cu samples with Al (upto 10 wt-%) did not show fracture upto strain of 40%. Abrasion wear was the predominant wear mechanism in pure Cu and Cu–Al alloys after sliding against SiC. The Al addition to Cu drastically decreased the wear rate (198 ×10−3 to 3.8 ×10−3 mm3 N–1m–1) of Cu–Al alloys. The present work demonstrates the advantage of the addition of (5–10 wt-%) Al to Cu in achieving good combination of mechanical and wear properties of Cu–Al alloys.
{"title":"Microstructure, mechanical and wear property correlation of Al bronze alloys","authors":"Mahammad Ali Shaik, Brahma Raju Golla","doi":"10.1080/00325899.2022.2079183","DOIUrl":"https://doi.org/10.1080/00325899.2022.2079183","url":null,"abstract":"ABSTRACT In the present work, the effect of Al content (0, 3, 5, 10, 15 wt-%) on the microstructure, mechanical and wear properties of Cu was systematically studied. Interestingly, the core–shell microstructure was observed in the Cu–Al alloys or Al bronzes with different layers of α-Cu, and intermetallic phases. The Cu–Al alloys displayed good compressive yield strength of 174–653 MPa, in particular, the Cu samples with Al (upto 10 wt-%) did not show fracture upto strain of 40%. Abrasion wear was the predominant wear mechanism in pure Cu and Cu–Al alloys after sliding against SiC. The Al addition to Cu drastically decreased the wear rate (198 ×10−3 to 3.8 ×10−3 mm3 N–1m–1) of Cu–Al alloys. The present work demonstrates the advantage of the addition of (5–10 wt-%) Al to Cu in achieving good combination of mechanical and wear properties of Cu–Al alloys.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47765333","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}
Pub Date : 2022-05-21DOI: 10.1080/00325899.2022.2076311
J. Pötschke, A. Vornberger, T. Gestrich, L. Berger, A. Michaelis
ABSTRACT High-entropy carbides (HEC) are a class of promising new hard phases for a sustainable improvement of hardmetal properties. In this work, hardmetals of the HEC (Ta,Nb,Ti,V,W)C were studied with two typical binder volume fractions of 16 and 24 vol-% consisting of Co, Ni and FeNi. The sintering behaviour, microstructure, phase composition, magnetic and mechanical properties are discussed and are compared to a conventional WC-Co hardmetal. It was shown that the HEC has a high-phase stability and that dense hardmetals with promising mechanical properties were obtained.
{"title":"Influence of different binder metals in high entropy carbide based hardmetals","authors":"J. Pötschke, A. Vornberger, T. Gestrich, L. Berger, A. Michaelis","doi":"10.1080/00325899.2022.2076311","DOIUrl":"https://doi.org/10.1080/00325899.2022.2076311","url":null,"abstract":"ABSTRACT\u0000 High-entropy carbides (HEC) are a class of promising new hard phases for a sustainable improvement of hardmetal properties. In this work, hardmetals of the HEC (Ta,Nb,Ti,V,W)C were studied with two typical binder volume fractions of 16 and 24 vol-% consisting of Co, Ni and FeNi. The sintering behaviour, microstructure, phase composition, magnetic and mechanical properties are discussed and are compared to a conventional WC-Co hardmetal. It was shown that the HEC has a high-phase stability and that dense hardmetals with promising mechanical properties were obtained.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44134055","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}
Pub Date : 2022-05-12DOI: 10.1080/00325899.2022.2073013
E. Hosseini, M. Amirjan, N. Parvin
ABSTRACT In the present work, three novel brazing powders were produced, in addition to a commercial composition, by the mechanical alloying (MA) method. Cobalt and chromium’s effects on the properties of brazing powder and related joints were investigated. The results showed that; with the addition of cobalt, the powder morphology went to a rounded and near-spherical shape after 15 milling hours, and the solidus significantly raised. Also, chromium shifted the melting range to higher temperatures. The powder with 6% cobalt and 14% chromium had more than 100°C higher solidus and a melting range of 20°C than the commercial BNi-2, ideal for working temperature of more than 1000°C. The shear strength results revealed that the addition of chromium and cobalt significantly promotes joint strength owing to the activation of the solid solution strengthening mechanism. Therefore, the novel synthesized brazing powders can be an excellent candidate for high temperature and corrosive operating environments.
{"title":"Preparation and characterisation of nickel-based brazing powder: cobalt and chromium addition effects","authors":"E. Hosseini, M. Amirjan, N. Parvin","doi":"10.1080/00325899.2022.2073013","DOIUrl":"https://doi.org/10.1080/00325899.2022.2073013","url":null,"abstract":"ABSTRACT In the present work, three novel brazing powders were produced, in addition to a commercial composition, by the mechanical alloying (MA) method. Cobalt and chromium’s effects on the properties of brazing powder and related joints were investigated. The results showed that; with the addition of cobalt, the powder morphology went to a rounded and near-spherical shape after 15 milling hours, and the solidus significantly raised. Also, chromium shifted the melting range to higher temperatures. The powder with 6% cobalt and 14% chromium had more than 100°C higher solidus and a melting range of 20°C than the commercial BNi-2, ideal for working temperature of more than 1000°C. The shear strength results revealed that the addition of chromium and cobalt significantly promotes joint strength owing to the activation of the solid solution strengthening mechanism. Therefore, the novel synthesized brazing powders can be an excellent candidate for high temperature and corrosive operating environments.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45871262","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}
Pub Date : 2022-05-11DOI: 10.1080/00325899.2022.2069540
L. Lacoste, A. Sakly, S. Dépinoy, S. Lebel, B. Vayre, C. Colin
ABSTRACT Additively manufactured (AM) parts generally exhibit large columnar grains and a preferential crystallographic texture. While this microstructure may have beneficial effects, for instance on creep properties, the resulting mechanical anisotropy remains a key issue for most critical in-service applications. The relationship between the solidification conditions and the melt pool morphology of the Inconel 718 fabricated by laser powder bed fusion (L-PBF) was investigated to adapt the microstructural characteristics of the parts to their intended applications. By optimising the length of the scanned vectors, it is possible to reduce both the texture index and the grain size by a factor 2 based on EBSD analyses. In addition, the aspect ratio and the grain density can be increased by a factor 1.1 and 2.2, respectively, compared to a conventional L-PBF scanning strategy. These achievements pave the way for the production of fully isotropic parts and/or anisotropic parts controlled by the L-PBF process.
{"title":"Microstructure control of Additively manufactured IN718 By L-PBF process","authors":"L. Lacoste, A. Sakly, S. Dépinoy, S. Lebel, B. Vayre, C. Colin","doi":"10.1080/00325899.2022.2069540","DOIUrl":"https://doi.org/10.1080/00325899.2022.2069540","url":null,"abstract":"ABSTRACT Additively manufactured (AM) parts generally exhibit large columnar grains and a preferential crystallographic texture. While this microstructure may have beneficial effects, for instance on creep properties, the resulting mechanical anisotropy remains a key issue for most critical in-service applications. The relationship between the solidification conditions and the melt pool morphology of the Inconel 718 fabricated by laser powder bed fusion (L-PBF) was investigated to adapt the microstructural characteristics of the parts to their intended applications. By optimising the length of the scanned vectors, it is possible to reduce both the texture index and the grain size by a factor 2 based on EBSD analyses. In addition, the aspect ratio and the grain density can be increased by a factor 1.1 and 2.2, respectively, compared to a conventional L-PBF scanning strategy. These achievements pave the way for the production of fully isotropic parts and/or anisotropic parts controlled by the L-PBF process.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43284148","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}
Pub Date : 2022-05-06DOI: 10.1080/00325899.2022.2069077
P. Xu, T. Ebel, F. Pyczak, R. Willumeit-Römer, Sen Yu
ABSTRACT The β titanium alloys are key materials in lightweight and biomedical applications, due to the combination of excellent biocompatibility and mechanical properties. However, the Binder-based Powder Technologies such as Metal-Injection-Molding (MIM), Binder-Jetting and Fused-Filament-Fabrication, normally introduce three major processing-related defects in the as-sintered Ti-parts: (i) residual porosity, (ii) high impurity level and (iii) coarse-grained structure. The previous studies revealed that these processing defects invariably tend to be even more severe in β titanium alloys than in α/β Ti-6Al-4V alloy, all fabricated by powder metallurgical route. In this work, these processing defects and their likely origins in MIM β titanium alloys are analysed. Furthermore, the influence of these defects on damage tolerance and fracture mechanisms of MIM β titanium alloys under either static or dynamic loading is investigated. Based on the studies, strategic technical improvements in the processing to improve the reliability of MIM β titanium alloys products are proposed.
{"title":"Influence of defects on damage tolerance of Metal-Injection-Molded β titanium alloys under static and dynamic loading","authors":"P. Xu, T. Ebel, F. Pyczak, R. Willumeit-Römer, Sen Yu","doi":"10.1080/00325899.2022.2069077","DOIUrl":"https://doi.org/10.1080/00325899.2022.2069077","url":null,"abstract":"ABSTRACT The β titanium alloys are key materials in lightweight and biomedical applications, due to the combination of excellent biocompatibility and mechanical properties. However, the Binder-based Powder Technologies such as Metal-Injection-Molding (MIM), Binder-Jetting and Fused-Filament-Fabrication, normally introduce three major processing-related defects in the as-sintered Ti-parts: (i) residual porosity, (ii) high impurity level and (iii) coarse-grained structure. The previous studies revealed that these processing defects invariably tend to be even more severe in β titanium alloys than in α/β Ti-6Al-4V alloy, all fabricated by powder metallurgical route. In this work, these processing defects and their likely origins in MIM β titanium alloys are analysed. Furthermore, the influence of these defects on damage tolerance and fracture mechanisms of MIM β titanium alloys under either static or dynamic loading is investigated. Based on the studies, strategic technical improvements in the processing to improve the reliability of MIM β titanium alloys products are proposed.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47683440","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}
Pub Date : 2022-05-04DOI: 10.1080/00325899.2022.2071194
Binghua Wu, Jie Wei, Jin-rong Wu, Mao-li Wang
ABSTRACT This paper describes a study of the influence of elemental nickel (Ni) and copper (Cu) elements on the tribological behaviour of a CoCr-based alloy. The tribology of CoCr-based alloys was examined by using a Bruker UMT-TriboLab machine with normal loads of 200 N, a frequency of 3 Hz, and a duration of 10 min. The Co70Cr20Ni5Cu5 alloy with 5wt-% Ni and 5wt-% Cu content showed the best wear property compared with other alloys, with a minimum friction coefficient of 0.147. The large improvement in wear resistance is related to the strongly inhibiting effect of crack initiation and growth in the worn surface, which reduces delamination wear. Because of the Co0.52Cu0.48 plastic deformation layer, hard phases like NiCoCr and CrCo can slip easily on the sliding interface and embed into the matrix, which may decrease delamination wear and reduce the crack growth rate.
{"title":"Friction and wear of cobalt–chromium–nickel–copper alloy in contact with tungsten-carbide-sintered balls","authors":"Binghua Wu, Jie Wei, Jin-rong Wu, Mao-li Wang","doi":"10.1080/00325899.2022.2071194","DOIUrl":"https://doi.org/10.1080/00325899.2022.2071194","url":null,"abstract":"ABSTRACT This paper describes a study of the influence of elemental nickel (Ni) and copper (Cu) elements on the tribological behaviour of a CoCr-based alloy. The tribology of CoCr-based alloys was examined by using a Bruker UMT-TriboLab machine with normal loads of 200 N, a frequency of 3 Hz, and a duration of 10 min. The Co70Cr20Ni5Cu5 alloy with 5wt-% Ni and 5wt-% Cu content showed the best wear property compared with other alloys, with a minimum friction coefficient of 0.147. The large improvement in wear resistance is related to the strongly inhibiting effect of crack initiation and growth in the worn surface, which reduces delamination wear. Because of the Co0.52Cu0.48 plastic deformation layer, hard phases like NiCoCr and CrCo can slip easily on the sliding interface and embed into the matrix, which may decrease delamination wear and reduce the crack growth rate.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43053449","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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