Microstructure and mechanical properties of TIG welding-brazed joint between tungsten and steel

被引：0
|
作者：
Yang Z.-H. [1 ,2 ]
Shen Y.-F. [3 ]
Li X.-Q. [1 ,2 ]
Chu Y.-J. [1 ,2 ]
机构：
[1] School of Materials Engineering, Nanjing Institute of Technology, Nanjing
[2] Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing
[3] College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Cleavage fracture; Tungsten; Welding-brazing;
D O I：
10.19476/j.ysxb.1004.0609.2019.03.17
中图分类号：
学科分类号：
摘要：
The dissimilar material joint between tungsten and 0Cr13Al steel was fabricated by TIG arc welding-brazing process with NiCrMo-3 wire as filling metal. The microstructures, composition distribution, fracture characteristics and properties of the joints were studied by OM, SEM, EDS, microhardness tester and electronic universal testing machine. The results show that NiCrMo-3 filler metal has a good wettability with tungsten. The W atoms from surface dissolution of tungsten diffuse into welding seam and the rich W, Ni intermetallic compound form on the interface of tungsten/welding seam which is discontinuous and the thickness is not more than 1 µm. The martensite layer whose thickness is 5-10 µm forms in steel along fusion line due to the diffusion of Ni element into steel. The welding seam can be roughly divided into W atom solid solution strengthening zone, complete mixing zone and incomplete mixing zone with great difference in microhardness. The tensile strength of joint is 167 MPa. Most of fracture surface is located in tungsten base metal and is 50-300 µm from the tungsten matrix/weld seam interface. The fracture is typical cleavage fracture. © 2019, Science Press. All right reserved.
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页码：579 / 585
页数：6
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