Effect of solution heat treatment on the microstructure and mechanical properties of Inconel 625 superalloy fabricated by laser solid forming

被引：147

作者：

Hu, Y. L. ^{[1
,2
]}

Lin, X. ^{[1
,2
]}

Zhang, S. Y. ^{[1
,2
]}

Jiang, Y. M. ^{[1
,2
]}

Lu, X. F. ^{[1
,2
]}

Yang, H. O. ^{[1
,2
]}

Huang, W. D. ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, 127 Youyixilu, Xian 710072, Shaanxi, Peoples R China

[2] Northwestern Polytech Univ, MIIT China, Key Lab Met High Performance Addit Mfg & Innovat, 127 Youyixilu, Xian 710072, Shaanxi, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 767卷

基金：

中国国家自然科学基金;

关键词：

Laser solid forming; Solution heat treatment; Microstructure; Laves phase; Mechanical properties; NB-BEARING SUPERALLOYS; LAVES PHASE; STAINLESS-STEEL; ALLOY; DEPOSITION; EVOLUTION; BEHAVIOR; SOLIDIFICATION; DISSOLUTION; RECRYSTALLIZATION;

D O I：

10.1016/j.jallcom.2018.07.087

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, the effect of solution heat treatments on the microstructure and mechanical properties of Inconel 625 superalloy fabricated by laser solid forming was investigated. The microstructure of deposit was mainly composed of columnar grains, which didn't change until the solution temperature reached 1200 degrees C after solution heat treatment. Due to the large size Laves phase which can pin grain boundary and obstruct grain boundary migration, the recrystallization fully occurred when the solution temperature exceeded 1200 degrees C. With the increment of the solution temperature, the average diffusion coefficient of solute elements and the dissolution velocity increased obviously. Besides, the volume fraction and size of Laves phase decreased, and the dislocation density decreased apparently. As a result, the microhardness and yield strength decreased with the increment of the solution temperature, but the tensile strength didn't change much after solution heat treatment, and the elongation increased significantly with the solution temperature improving. The room-temperature tensile properties in different states of Inconel 625 fabricated by laser solid forming were higher than those of Inconel 625 fabricated by casting. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：330 / 344

页数：15

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