Microstructure and high temperature fracture toughness of NG-TIG welded Inconel 617B superalloy

被引：18

作者：

Li, Xiaogang ^{[1
]}

Li, Kejian ^{[1
]}

Li, Shanlin ^{[1
]}

Wu, Yao ^{[4
]}

Cai, Zhipeng ^{[1
,2
,3
]}

Pan, Jiluan ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China

[2] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

[3] Tsinghua Univ, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing 100084, Peoples R China

[4] Tsinghua Univ, Res Inst Adv Equipment, Tianjin 300304, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2020年 / 39卷 / 39期

基金：

中国国家自然科学基金;

关键词：

Nickel alloys; Welding; Fracture behavior; Microstructure; Misorientation; STRETCH ZONE WIDTH; STEEL; PROPERTY;

D O I：

10.1016/j.jmst.2019.07.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study, the microstructure, fracture toughness, and fracture behavior of Inconel 617B narrow gap tungsten inert gas (NG-TIG) welded joint were investigated systematically at the designed service temperature of 700 degrees C. Fracture toughness (J(0.2)) of base metal (BM) and heat affected zone (HAZ) was higher than that of weld metal (WM). In HAZ and BM, strain mainly localised at grain boundaries with large misorientation and there were lots of coincidence site lattice (CSL) Sigma 3 boundaries related to twins inside grains, which led to the much higher fracture toughness of BM and HAZ than WM. The high numbers of twins as well as the less serious strain localization at grain boundaries resulted in the most outstanding fracture toughness of BM. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：173 / 182

页数：10

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