Microstructure and Mechanical Properties of a Spray-Formed Superalloy
Microstructure and Mechanical Properties of a Spray-Formed Superalloy作者机构:School of Materials Science and Engineering Harbin University of Science and Technology School of Materials Science and Engineering Harbin Institute of Technology
出 版 物:《Acta Metallurgica Sinica(English Letters)》 (金属学报(英文版))
年 卷 期:2014年第27卷第6期
页 面:1063-1069页
核心收录:
学科分类:08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程(可授工学、理学学位)] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程]
主 题:Spray formed superalloy Microstructure Ageing harden Mechanical properties
摘 要:The microstructural evolution and mechanical properties of a spray-formed superalloy were studied in this paper. Based on a better understanding of the microstructural evolution of the spray-formed superalloy during solution treatment, an optimum solution treatment process was obtained, namely, at 1,140 °C for 6 h, and air cooling(AC). The effects of the ageing treatments on the mechanical properties of the post-solution-treated spray-formed superalloy were evaluated using ageing harden curves and tensile testing. The results indicated that the maximum hardness value was achieved at 850 °C for 8 h, AC. Due to co-precipitation of primary and secondary c0 precipitates during the heat treatment,the spray-formed superalloy obtained an excellent combination of yield strength(YS = 1,110 MPa), ultimate tensile strength(UTS = 1,503 MPa), ductility(elongation, EL = 21%) and excellent stress rupture properties at 650 °C(UTS = 1,209 MPa, EL = 15.8%). The heat treatment also improved the rupture life at 650 °C/950 MPa and 750 °C/539 MPa up to 140 h without rupturing. The tensile-fractured surfaces exhibit ductile transgranular failure feature. The optimum heat treatment process was determined to be 1,140 °C/6 h+850 °C/8 h+AC.