热处理对316L钢/Inconel625镍基合金双金属增材结构件微观组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2026.01.030

金属热处理 ›› 2026, Vol. 51 ›› Issue (1): 207-213.DOI: 10.13251/j.issn.0254-6051.2026.01.030

热处理对316L钢/Inconel625镍基合金双金属增材结构件微观组织与力学性能的影响

王天琪¹, 李浩然¹, 刘海华¹, 李晨东²

1.天津工业大学天津市现代机电装备技术重点实验室, 天津 300387;
2.中国长峰机电技术研究设计院, 北京 100089

收稿日期:2025-08-04 修回日期:2025-11-07 出版日期:2026-01-25 发布日期:2026-01-27
作者简介:王天琪(1981—),男,副教授,主要研究方向为金属电弧增材制造,E-mail:wtq0622@163.com
基金资助:
国家自然科学基金(51975410);天津市“项目+团队”重点培养专项(XC202053)

Effect of heat treatment on microstructure and mechanical properties of 316L steel/nickel based Inconel625 alloy bimetallic additive structure

Wang Tianqi¹, Li Haoran¹, Liu Haihua¹, Li Chendong²

1. Tianjin Key Laboratory of Modern Mechatronics Equipment Technology, Tiangong University, Tianjin 300387, China;
2. China Changfeng Electromechanical Technology Research and Design Institute, Beijing 100089, China

Received:2025-08-04 Revised:2025-11-07 Online:2026-01-25 Published:2026-01-27

摘要/Abstract

摘要： 采用基于冷金属过渡焊的电弧快速成形技术制备得到316L-Inconel625双金属增材结构件,研究了固溶处理、时效处理以及固溶+时效处理对双金属结构件微观组织与力学性能的影响。结果表明:沉积态试样316L钢侧的组织主要为等轴奥氏体晶粒;Inconel625合金侧组织为柱状树枝晶,基体组织为γ-(Fe,Ni)固溶体,并且在晶界上存在大量Laves相。固溶处理后,Inconel625合金侧的Laves相溶解,基体中Nb,Mo元素含量提升。同时通过EBSD观察到316L钢侧奥氏体晶粒发生再结晶,晶粒长大并且伴有退火孪晶。固溶+时效处理后的双金属结构件在室温下的抗拉强度与屈服强度较沉积态有所降低,但是塑性大幅提升,且在600 ℃高温下强度与塑性协同提升,抗拉强度达到353 MPa,伸长率达到45.5%。

关键词: 双金属增材制造, 固溶处理, 时效处理, 显微组织, 力学性能

Abstract: 316L-Inconel625 bimetallic additive structure was prepared by cold metal transfer wire arc additive manufacturing, and the effect of solution treatment, aging treatment and solution+aging treatment on the microstructure and mechanical properties of the bimetallic additive structure was investigated. The results show that the microstructure of the 316L steel side of the as-deposited specimen is mainly equiaxed austenite grains, meanwhile, the microstructure of the Inconel625 alloy side is columnar dendrites, the matrix is γ-(Fe, Ni) solid solution and a large number of Laves phases existed on the grain boundaries. After solution treatment, for the Inconel625 alloy side, the Laves phase is dissolved and the content of Nb and Mo elements in the matrix increases. At the same time, for the 316L steel side, the recrystallization of austenitic grains is observed through EBSD, and the grains grow accompanied by annealing twins. After solution+aging treatment, the room temperature tensile strength and yield strength of the bimetallic additive structure decrease comparing to the as-deposited specimen, but the plasticity is significantly improved, and the high temperature strength and plasticity at 600 ℃ are synergistically improved, with tensile strength of 353 MPa and the elongation of 45.5%.

Key words: bimetallic additive manufacturing, solution treatment, aging treatment, microstructure, mechanical properties

中图分类号:

TG444

王天琪, 李浩然, 刘海华, 李晨东. 热处理对316L钢/Inconel625镍基合金双金属增材结构件微观组织与力学性能的影响[J]. 金属热处理, 2026, 51(1): 207-213.

Wang Tianqi, Li Haoran, Liu Haihua, Li Chendong. Effect of heat treatment on microstructure and mechanical properties of 316L steel/nickel based Inconel625 alloy bimetallic additive structure[J]. Heat Treatment of Metals, 2026, 51(1): 207-213.

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热处理对316L钢/Inconel625镍基合金双金属增材结构件微观组织与力学性能的影响

Effect of heat treatment on microstructure and mechanical properties of 316L steel/nickel based Inconel625 alloy bimetallic additive structure

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