Microstructure and Fracture Toughness of Fe-Nb Dissimilar Welded Joints

被引：6

作者：

Chu, Qiaoling ^{[1
,2
,3
]}

Zhang, Lin ^{[1
]}

Xia, Tuo ^{[1
]}

Cheng, Peng ^{[4
]}

Zheng, Jianming ^{[5
]}

Zhang, Min ^{[1
]}

Li, Jihong ^{[1
]}

Yan, Fuxue ^{[1
]}

Yan, Cheng ^{[3
]}

机构：

[1] Xian Univ Technol, Sch Mat & Engn, Xian 710048, Peoples R China

[2] CGN DELTA Jiangsu Plast & Chem Co Ltd, Taicang 215421, Peoples R China

[3] Queensland Univ Technol QUT, Sci & Engn Fac, Sch Mech Med & Proc Engn, Brisbane, Qld 4001, Australia

[4] CGN Adv Mat Technol Suzhou Co Ltd, Taicang 215400, Peoples R China

[5] Xian Univ Technol, Sch Mech & Precis Instrument Engn, Xian 710048, Peoples R China

来源：

METALS | 2021年 / 11卷 / 01期

基金：

中国国家自然科学基金; 澳大利亚研究理事会; 中国博士后科学基金;

关键词：

fracture toughness; welding; intermetallics; nanoindentation;

D O I：

10.3390/met11010086

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The relation between the microstructure and mechanical properties of the Fe-Nb dissimilar joint were investigated using nanoindentation. The weld metal consists mainly of Fe2Nb, alpha-Fe + Fe2Nb, Nb (s,s) and Fe7Nb6 phases. Radial cracks initiate from the corners of the impressions on the Fe2Nb phase (similar to 20.5 GPa) when subjected to a peak load of 300 mN, whereas the fine lamellar structures (alpha-Fe + Fe2Nb) with an average hardness of 6.5 GPa are free from cracks. The calculated fracture toughness of the Fe2Nb intermetallics is 1.41 +/- 0.53 MPam(1/2). A simplified scenario of weld formation together with the thermal cycle is proposed to elaborate the way local phase determined the mechanical properties.

引用

页码：1 / 9

页数：9

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