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
张雷雷 1陈晶阳 2任晓冬 2张明军 2汤鑫 2肖程波 2杨卿3
作者信息
- 1. 西安理工大学 材料科学与工程学院,西安 710048;中国航发北京航空材料研究院 先进高温结构材料重点实验室,北京 100095
- 2. 中国航发北京航空材料研究院 先进高温结构材料重点实验室,北京 100095
- 3. 西安理工大学 材料科学与工程学院,西安 710048
- 折叠
摘要
采用金相显微镜和场发射扫描电子显微镜(FE-SEM)研究不同固溶温度(1140,1160℃及1180℃)及固溶冷却方式(AC,FC-900℃+AC,FC)等热处理参数对K439B合金显微组织及力学性能的影响.结果表明:提高固溶温度后合金的光学组织及γ′相形貌接近,晶界宽度略有增加.当以AC方式冷却时,γ′相均匀分布,尺寸为50.7 nm;以FC-900℃+AC方式冷却时,枝晶间及晶界附近析出250～510 nm的粗大γ′相,γ′相呈双态形貌;以FC方式冷却时,粗大γ′相的含量增多,且晶界颗粒状M23C6碳化物含量有所提高.降低冷却速率后K439B合金的815℃/379 MPa持久寿命得到较大改善,不同固溶参数对热处理K439B合金的室温拉伸性能影响较小.
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引用本文复制引用
基金项目
国家科技重大专项(J2019-VI-0004-0117)
先进高温结构材料重点实验室基金(6142903220101)
先进高温结构材料重点实验室基金(6142903210104)
中国航空发动机集团科技创新平台项目(CXPT-2018-006)
出版年
2024
国家科技期刊平台
NSTL
万方数据