The eta phases and mechanical properties of TIG welded joints of WC-Co cemented carbide and steel

The eta phases and mechanical properties of TIG welded joints of WC-Co cemented carbide and

steel

作者：赵秀娟;杨德新;王浩;高泽幸治;田头孝介;山森英明

作者机构：Department of Materials Science and Engineering,Dalian Railway University,Dalian,116028;Department of Materials Science and Engineering,Dalian Railway University,Dalian,116028;Department of Materials Science and Engineering,Dalian Railway University,Dalian,116028;Tomakomai National College of Technology,Tomakomai,059-1275,Japan;Muroran Institute of Technology,Muroran,050-8585,Japan;Muroran Institute of Technology,Muroran,050-8585,Japan 来源：中国焊接 ISSN：1004-5341 年：2004 卷：013 期：001 页码：56-60 页数：5 中图分类：TG4 正文语种：chi

关键词：eta phase;TIG welding;cemented carbide;bending strength 摘要：The tungsten-inert-gas (TIG) arc welding experiments of

cemented carbide YG30 and steel 45 were carried out using the Ni-Fe-C filling alloys. The eta phases and mechanical properties of welded joints

were analyzed by means of scanning electronic microscope (SEM), transmission electronic microscope (TEM) coupled with selected diffraction, electronic probe microanalysis and bending strength methods. The experimental results show that the chemical composition of the filling alloys affects eta phase formation. When the carbon and nickel contents in filling alloys are 0.61 wt% and 55.29 wt%, respectively, no eta phases form. And the joint bending strength is the highest to 1.352

GPa. But if they are 0.01wt% and 55.38wt%, the eta phases are

formed at the boundaries of the cemented carbide and the weld, and the thickness of eta phase layer is about 110 micrometers. And the joint bending strength is low. Usually, these eta phases are anomalously granular, and easy to accumulate at the boundaries between cemented carbides and the weld. They are multiple M6C rich in tungsten and iron.