固溶温度对改型In617合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2021.08.021

金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 109-114.DOI: 10.13251/j.issn.0254-6051.2021.08.021

固溶温度对改型In617合金组织和性能的影响

李其^1,2,3, 陈正宗², 蒋新亮³, 刘正东², 左良¹

1.东北大学材料各向异性与织构教育部重点实验室, 辽宁沈阳 110819;
2.钢铁研究总院特殊钢研究所, 北京 100081;
3.二重(德阳)重型装备有限公司大型铸锻件数值模拟国家工程实验室, 四川德阳 618000

收稿日期:2021-03-30 出版日期:2021-08-25 发布日期:2021-12-09
作者简介:李其(1983—),男,高级工程师,主要研究方向为大型铸锻件材料开发、失效分析、热处理工艺等,E-mail:neuliqi@163.com

Effect of solution treatment temperature on microstructure and properties of modified In617 alloy

Li Qi^1,2,3, Chen Zhengzong², Jiang Xinliang³, Liu Zhengdong², Zuo Liang¹

1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang Liaoning 110819, China;
2. Institute for Special Steels, Central Iron & Steel Research Institute, Beijing 100081, China;
3. National Engineering Laboratory of Numerical Simulation on Heavy Castings and Forgings, China Erzhong Group (Deyang) Heavy Industries Co., Ltd., Deyang Sichuan 618000, China

Received:2021-03-30 Online:2021-08-25 Published:2021-12-09

摘要/Abstract

摘要： 通过光学显微镜(OM)、扫描电镜(SEM)表征、EDS分析以及力学性能测试等方法研究了固溶温度对改型Inconel617(In617)合金组织和性能的影响。结果表明,改型In617合金在950~1200 ℃固溶2.5 h,平均晶粒尺寸从18 μm增长至183 μm;并建立了改型In617合金在950~1200 ℃固溶处理过程中的晶粒长大动力学模型。当固溶温度为1000 ℃时,晶界处M₂₃C₆碳化物回溶;超过1100 ℃固溶时,M₆C碳化物也基本回溶完毕,合金中仅存大尺寸MC型碳化物。随着固溶温度升高,混晶现象发生,合金高温强度逐渐降低,主要归因于碳化物的逐步回溶。其中在1050 ℃固溶时,由于晶界碳化物没有回溶完毕,所以此时改型In617合金的强度下降幅度不高,而当固溶温度达到1200 ℃时,晶界处碳化物消失,晶粒已经长大,导致合金强度大幅降低。

关键词: 改型In617合金, 固溶温度, 碳化物, 显微组织, 混晶, 力学性能

Abstract: Effects of solution treatment temperature on microstructure and properties of modified In617 alloy were studied by means of OM and SEM characterization, EDS analysis and mechanical properties test. The results show that the average grain size of the alloy increases from 18 μm to 183 μm after solution treatment at 950-1200 ℃ for 2.5 h. The kinetic model of grain growth of the alloy during solution treatment at 950-1200 ℃ is established. When the solution treatment temperature is 1000 ℃, the M₂₃C₆ carbide at grain boundary is re-dissolved. When the solution treatment temperature exceeds 1100 ℃, the dissolution of M₆C carbides is basically completed, and only large-size MC carbides exist in the alloy. When the solid solution treatment temperature rises, the mixed grain phenomenon occurs, and the high temperature strength of the alloy gradually decreases, which is mainly due to the gradual redissolution of the carbides. When the solid solution treatment temperature is 1050 ℃, the strength of the alloy decreases a little due to insufficient dissolution of the carbides at grain boundary. When the solution treatment temperature increases to 1200 ℃, the strength of the alloy is greatly reduced due to that the carbides at grain boundary disappear and the grain growth.

Key words: modified In617 alloy, solution treatment temperature, carbide, microstructure, mixed grain, mechanical properties

中图分类号:

TG156.94

李其, 陈正宗, 蒋新亮, 刘正东, 左良. 固溶温度对改型In617合金组织和性能的影响[J]. 金属热处理, 2021, 46(8): 109-114.

Li Qi, Chen Zhengzong, Jiang Xinliang, Liu Zhengdong, Zuo Liang. Effect of solution treatment temperature on microstructure and properties of modified In617 alloy[J]. Heat Treatment of Metals, 2021, 46(8): 109-114.

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固溶温度对改型In617合金组织和性能的影响

Effect of solution treatment temperature on microstructure and properties of modified In617 alloy

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