摘要
本文选用不同厚度的Ni-Fe、Ni-Fe-C-Mn-Nb因瓦合金,与YG30在不加填充材料、对接条件下直接进行TIG焊接试验,运用光学显微镜、扫描电镜、显微硬度仪等对焊接接头的显微组织和硬度进行研究分析。结果表明,Ni-Fe因瓦合金与YG30连接,在YG30/因瓦合金焊接接头界面区硬质合金侧形成η-碳化物;Ni-Fe-C-Mn-Nb因瓦合金与YG30连接,在界面区没有η-碳化物形成。不同厚度、不同工艺参数的焊接接头中,厚度为2mm、电流为135A和厚度为4mm、电流为145A的两种焊接接头组织均匀,界面冶金结合良好,硬度分布过渡平缓。
In this paper, according to using different thicknesses Ni-Fe, Ni-Fe-C-Mn-Nb Invar alloys and YG30 under the docking condition and no filling material, the welding experiments are carried out. Furthermore, the microstructure ＆ hardness of welded joints are analyzed by using optical microscopy, scanning electron microscopy and microhardness, and so on. The experements＇ results show that η-carbide which located in the interface zone of YG30/Invar alloy welded joints about hard alloy side is formed, when Ni-Fe Invar alloy be connected to YG30; meanwhile, there is no η-carbide formed in the interface zone, when Ni- Fe-C-Mn-Nb Invar alloy be connected to YG30. Among welded joints of different thicknesses and technical parameters, the welded joints have uniform structure, good metallurgical combination of interface, and smooth hardness distribution of the transition, when the thickness is 2 mm, and current is 135 A, and they are 4 mm, and 154 A respectively.
出处
《硬质合金》
CAS
北大核心
2008年第4期208-213,222,共7页
Cemented Carbides
基金
上海市教委优青专项基金(06xpyq17)资助
上海市晨光计划(2008cg62)
