YG30硬质合金与45^#钢TIG焊接头组织及抗弯强度的研究  

Investigation on the microstructure and bending strength of welded joints of hard alloy YG30 and steel 45

作　　者：王浩[1] 杨德新[1] 赵秀娟[1] 陈春焕[1] 王庆章 

机构地区：[1]大连铁道学院材料科学与工程系,辽宁大连116028 [2]大连重工集团有限公司焊接技术研究所,辽宁大连116022

出　　处：《焊接技术》2005年第1期9-11,共3页Welding Technology

摘　　要：选用Ni-Fe合金和Ni-Fe-C合金作为填充金属对YG30硬质合金与45#钢进行了TIG焊试验。运用扫描电镜、X射线衍射、弯曲力学性能试验等方法对焊接接头的组织形态、物相及抗弯强度进行了研究。结果表明,分布于YG30/焊缝界面区域的η相为M6C型的Fe3W3C,η相的存在是焊接接头抗弯强度低下的原因。选择适当碳含量的Ni-Fe-C合金作为填充金属,能够提高焊接接头的抗弯强度。TIG welding test of YG30 and steel 45 was carried out with the filling metals made of Ni-Fe and Ni-Fe-C alloys. The scanning electronic microscope (SEM), X-ray and bending strength test were used to analyze the microstructure, phase and bending strength of the welded joints. The results showed that the η phase distributing at the interface of YG30 and weld bead was Fe3W3C, which belonged to the type of M6C. The η phase caused lower the bending strength of the welded joint. By using Ni-Fe-C alloy with proper carbon content as filler metal, the bending strength of the welded joint could be improved.

关 键 词：Η相 TIG焊 硬质合金 抗弯强度 

分 类 号：TG457.1[金属学及工艺—焊接] TG407