Plastic deformation behavior and dynamic recrystallization of Inconel 625 superalloy fabricated by directed energy deposition

被引：80

作者：

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

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

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

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

Gao, X. H. ^{[1
,2
]}

Liu, F. G. ^{[1
,2
]}

Li, X. ^{[1
]}

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：

MATERIALS & DESIGN | 2020年 / 186卷

基金：

中国国家自然科学基金;

关键词：

Directed energy deposition; Inconel; 625; superalloy; Constitutive equations; Deformation activation energy; Dynamic recrystallization; AUSTENITIC STAINLESS-STEEL; HOT DEFORMATION; MICROSTRUCTURE EVOLUTION; MECHANICAL-PROPERTIES; STRAIN-RATE; ALLOYS; MODEL; 304L; COLD;

D O I：

10.1016/j.matdes.2019.108359

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the hot plastic deformation behavior and dynamic recrystallization (DRX) phenomenon of Inconel 625 superalloy prepared by directed energy deposition (DED) are investigated by carrying out hot compression tests. The true stress-strain curves indicate that with the increment in deformation temperature and decrease in strain rate, the peak stress and flow stress reduce. Compared with wrought Inconel 625 superalloy, Inconel 625 superalloy fabricated by DED shows a higher flow stress, lower peak stress, and lower deformation activation energy under the same hot compression conditions. The fraction of recrystallized grain and recrystallized grain size increases with increasing temperature and decreasing strain rate. At lower deformation temperatures, continuous dynamic recrystallization is the main mechanism of DRX. However, discontinuous dynamic recrystallization becomes the predominant operating mechanism of DRX at high deformation temperature. In addition, the kinetics of DRX in DED Inconel 625 superalloy is much slower than that in forged Inconel 625. The results also show that DED Inconel 625 superalloy has higher thermal stability than that of forged Inconel 625 superalloy, which makes it possible for DED Inconel 625 superalloy to be employed at high temperatures. (c) 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页数：16