Effect of a Ni interlayer on microstructure and mechanical properties of WC-12Co cermet / SC45 steel friction stir welds
Effect of a Ni interlayer on microstructure and mechanical properties of WC-12Co cermet / SC45 steel friction stir welds
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DOI：
10.1016/j.jmapro.2019.02.032
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发表时间：
2019-04-01
影响因子：
6.2
通讯作者：
Taillard, R.
中科院分区：
文献类型：
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作者：
Avettand-Fenoel, M. N.;Nagaoka, T.;Taillard, R.
WC-12Co 金属陶瓷与 SC45 钢进行搅拌摩擦搭接焊接，有或没有不同厚度的 Ni 夹层。通过插入镍层，材料流的可视化变得容易。焊接导致在接头熔核中形成魏氏组织铁素体、低温珠光体、贝氏体、马氏体和残余奥氏体。在钢-金属陶瓷、钢-镍和镍-金属陶瓷界面处注意到一些相互扩散，这特别导致在Fe或Ni中形成过饱和的Co固溶体。研究表明，Ni 夹层厚度的增加会导致 Si3N4 刀具的磨损更加明显，并导致熔核中残留奥氏体的量更大。机械测试最终表明，镍轴承接头的界面质量比无镍接头的界面质量更好。
WC-12Co cermet was friction stir lap welded with SC45 steel with or without different thicknesses of a Ni interlayer. The visualization of the material flow was rendered easy by the insertion of the Ni layer. Welding gives rise to the formation of Widmanstatten ferrite, low temperature pearlite, bainite, martensite and retained austenite in the nuggets of the joints. Some interdiffusion is noticed at the steel-cermet, steel-Ni and Ni-cermet interfaces, which leads, in particular, to the formation of oversaturated Co solid solutions in Fe or in Ni. The increase in the Ni interlayer thickness is shown to lead to a more pronounced wear of the Si3N4 tool and to a greater amount of retained austenite in the nugget. The mechanical tests finally suggest that the interface of the Ni bearing joints is of better quality than that of the Ni-free joint.