材料工程2024，Vol.52Issue(4)：120-126,7.DOI:10.11868/j.issn.1001-4381.2022.001021
固溶参数对镍基高温合金K439B显微组织及力学性能的影响
Effect of solution parameters on microstructures and mechanical properties of K439 B nickel-based superalloy
摘要
Abstract
The effect of different solution temperatures(1140,1160℃and 1180℃)and cooling conditions(AC,FC-900℃+AC,FC)on the microstructures and mechanical properties of K439B alloy were investigated using metallographic microscopy and field emission scanning electron microscopy(FE-SEM).The results show that the optical microstructures and morphology of γ′ precipitates are similar and the width of grain boundary slightly increases after increasing the solution temperature.When cooled with AC,γ′precipitates are uniformly distributed and the average size is 50.7 nm;when cooled with FC-900℃+AC,the larger γ′ precipitates of 250-510 nm are precipitated at the interdendritic area region and near the grain boundary,exhibiting a bimodal γ′ microstructure;when cooled with FC,the volume fraction of larger γ′precipitates increases and the content of granular M23C6 carbides at grain boundary improves.The stress rupture life of K439B alloy at 815℃/379 MPa is enhanced after reducing the cooling rate,while different solution parameters have little effect on the room-temperature tensile property.关键词
镍基高温合金/K439B/固溶参数/显微组织/力学性能Key words
nickel-based superalloy/K439B/solution parameter/microstructure/mechanical property分类
矿业与冶金引用本文复制引用
张雷雷,陈晶阳,任晓冬,张明军,汤鑫,肖程波,杨卿..固溶参数对镍基高温合金K439B显微组织及力学性能的影响[J].材料工程,2024,52(4):120-126,7.基金项目
国家科技重大专项(J2019-VI-0004-0117) （J2019-VI-0004-0117）
先进高温结构材料重点实验室基金(6142903220101,6142903210104) （6142903220101,6142903210104）
中国航空发动机集团科技创新平台项目(CXPT-2018-006) （CXPT-2018-006）
