A Mn18Cr2 steel containing TiN precipitates was fabricated by vacuum induction melting.The morphology of TiN precipitates and the interface orientation relationship between TiN and γ-Fe were characterized by means of...A Mn18Cr2 steel containing TiN precipitates was fabricated by vacuum induction melting.The morphology of TiN precipitates and the interface orientation relationship between TiN and γ-Fe were characterized by means of SEM,TEM and SAED,and the formation mechanism of TiN precipitates in Mn18Cr2 steel was clarified.Results show that the TiN precipitates are more likely to exhibit a cubic-shaped morphology and form both within the grain and at the grain boundary of γ-Fe.The interface orientation relationship between TiN and γ-Fe is determined as follows:(100)_(TiN)//■_(γ-Fe),■_(TiN)//■_(γ-Fe).Because of the smallest interfacialmisfit,the secondary close-packed lane {100} of TiN preferentially combines with the close-packed plane {111} of γ-Fe during the precipitation in order to minimize the interface energy.After nucleation,the TiN precipitates exhibit cubic appearance due to the fact that the TiN has a FCC structure with rock salt type structure.This study provides reference for the material design of the austenitic high-manganese steels with excellent yield strength.展开更多
为了探索超高分子量聚乙烯 (UHMWPE)与钛基 - Ti N- Ti C系梯度薄膜材料组合作为人工关节置换材料的可能性 ,利用离子注入和等离子体化学气相沉积 (PCVD)方法制备了 Ti6 Al4V- Ti N- Ti C系梯度薄膜材料。通过摩擦系数和 UHMWPE磨损失...为了探索超高分子量聚乙烯 (UHMWPE)与钛基 - Ti N- Ti C系梯度薄膜材料组合作为人工关节置换材料的可能性 ,利用离子注入和等离子体化学气相沉积 (PCVD)方法制备了 Ti6 Al4V- Ti N- Ti C系梯度薄膜材料。通过摩擦系数和 UHMWPE磨损失重的测定和用 SEM对磨损后的 U HMWPE表面形貌分析 ,研究了 U HMWPE与Ti6 Al4V- Ti N- Ti C系梯度薄膜材料摩擦副的生物摩擦磨损特性。研究表明 :在人血清润滑下 ,随配对的梯度薄膜材料表面硬度的增加 ,UHMWPE磨损量减小。与硬度大的 Ti6 Al4V- Ti N- Ti C梯度薄膜材料对磨时 ,UHMWPE的磨损量最小 ,为该摩擦副作为人工关节置换材料提供了依据。还对各摩擦副的 U展开更多
基金the financial support from the National Natural Science Foundation of China(Grant No.U1604251)the Major Scientific and Technological Project of Luoyang,China(Grant No.2001017A)。
文摘A Mn18Cr2 steel containing TiN precipitates was fabricated by vacuum induction melting.The morphology of TiN precipitates and the interface orientation relationship between TiN and γ-Fe were characterized by means of SEM,TEM and SAED,and the formation mechanism of TiN precipitates in Mn18Cr2 steel was clarified.Results show that the TiN precipitates are more likely to exhibit a cubic-shaped morphology and form both within the grain and at the grain boundary of γ-Fe.The interface orientation relationship between TiN and γ-Fe is determined as follows:(100)_(TiN)//■_(γ-Fe),■_(TiN)//■_(γ-Fe).Because of the smallest interfacialmisfit,the secondary close-packed lane {100} of TiN preferentially combines with the close-packed plane {111} of γ-Fe during the precipitation in order to minimize the interface energy.After nucleation,the TiN precipitates exhibit cubic appearance due to the fact that the TiN has a FCC structure with rock salt type structure.This study provides reference for the material design of the austenitic high-manganese steels with excellent yield strength.
文摘为了探索超高分子量聚乙烯 (UHMWPE)与钛基 - Ti N- Ti C系梯度薄膜材料组合作为人工关节置换材料的可能性 ,利用离子注入和等离子体化学气相沉积 (PCVD)方法制备了 Ti6 Al4V- Ti N- Ti C系梯度薄膜材料。通过摩擦系数和 UHMWPE磨损失重的测定和用 SEM对磨损后的 U HMWPE表面形貌分析 ,研究了 U HMWPE与Ti6 Al4V- Ti N- Ti C系梯度薄膜材料摩擦副的生物摩擦磨损特性。研究表明 :在人血清润滑下 ,随配对的梯度薄膜材料表面硬度的增加 ,UHMWPE磨损量减小。与硬度大的 Ti6 Al4V- Ti N- Ti C梯度薄膜材料对磨时 ,UHMWPE的磨损量最小 ,为该摩擦副作为人工关节置换材料提供了依据。还对各摩擦副的 U
