| 多步热处理对GH4742合金组织性能的影响 |
| |
| 引用本文： | 贾志明,秦鹤勇,李振团,刘慧敏,于萍.多步热处理对GH4742合金组织性能的影响[J].金属热处理,2022,47(12):109-114. |
| |
| 作者姓名： | 贾志明 秦鹤勇 李振团 刘慧敏 于萍 |
| |
| 作者单位： | 1.中船重工龙江广瀚燃气轮机有限公司, 黑龙江 哈尔滨 150078;2.北京钢研高纳科技股份有限公司, 北京 100081 |
| |
| 基金项目： | 航空发动机及燃气轮机重大专项(2017-VI-0018-0090) |
| |
| 摘 要： | 采用多步热处理,研究了不同固溶温度和高温时效温度对GH4742高温合金组织性能的影响。结果表明,固溶温度显著改变晶粒尺寸和一次γ′相形态。固溶温度为1090 ℃时,基体中存在大量未溶的一次γ′相,可以有效阻止晶粒长大,同时这种粗大γ′相以及后续时效过程中形成的细小γ′相共存的组织使得合金具有良好的综合力学性能。高温时效处理对组织形貌影响较小,但可以改变γ′相的尺寸,显著影响晶界碳化物的形态,通过Mo置换一次碳化物MC中的Nb、Ti,使晶界连续分布的碳化物发生溶解形成颗粒状的碳化物,显著降低了GH4742高温合金的高温持久性能。
|
| 关 键 词： | GH4742合金 固溶温度 晶粒尺寸 高温性能 |
| 收稿时间： | 2022-06-16 |
Effect of multi-stage heat treatment on microstructure and properties of GH4742 alloy |
| |
| Jia Zhiming,Qin Heyong,Li Zhentuan,Liu Huimin,Yu Ping.Effect of multi-stage heat treatment on microstructure and properties of GH4742 alloy[J].Heat Treatment of Metals,2022,47(12):109-114. |
| |
| Authors: | Jia Zhiming Qin Heyong Li Zhentuan Liu Huimin Yu Ping |
| |
| Affiliation: | 1. CSIC Longjiang Guanghan Gas Turbine Co., Ltd., Harbin Heilongjiang 150078, China;2. Gaona Aero Material Co., Ltd., Beijing 100081, China |
| |
| Abstract: | Effects of different solution temperature and high aging temperature on microstructure and mechanical properties of GH4742 superalloy were studied by multi-stage heat treatment. The results show that the grain size and primary γ′ phase morphology can be significantly influenced by adjusting solution temperature. When the solution temperature is 1090 ℃, there are a large amount of undissolved primary γ′ phases in the matrix, which can effectively prevent the growth of grains, and the coexistence of those coarse primary γ′ phase and fine γ′ phase formed in the subsequent aging process makes the alloy achieves an excellent comprehensive mechanical properties. High temperature aging treatment has little effect on microstructure, but it can change the size of the γ′ phase and obviously affects the morphology of carbides on the grain boundary. By replacing Nb and Ti in the primary carbide MC with Mo, the carbides continuously distributed on the grain boundaries are dissolved to form granular carbides, which significantly reduces the high temperature durability of the GH4742 superalloy. |
| |
| Keywords: | GH4742 alloy solution temperature grain size high temperature property |
|
| 点击此处可从《金属热处理》浏览原始摘要信息 |
|
点击此处可从《金属热处理》下载全文 |
|
