1Cr17不锈钢表面TIG冷焊重熔和丝材熔敷工艺及改性层的组织和性能

Remelting and Wire Cladding Process by TIG Cold Welding on Surface of 1Cr17 Stainless Steel and Microstructures and Properties of Modified Layers

在1Cr17不锈钢表面进行钨极惰性气体保护(TIG)冷焊重熔及ER347L不锈钢焊丝熔敷工艺试验,并研究了重熔层和熔敷层的显微组织、显微硬度以及在质量分数为3.5%NaCl溶液中的电化学腐蚀性能。结果表明:TIG冷焊重熔时,当冷焊时间分别在200~150 ms、150~100 ms、100~50 ms范围内时,获得成形良好重熔层所需最小冷焊电流分别为40,70,100 A;TIG冷焊熔敷时,当冷焊时间分别为50,100,160,200 ms时,获得成形良好熔敷层所需最小冷焊电流分别为230,190,150,120 A。TIG冷焊重熔或熔敷形成的热影响区(HAZ)晶粒较1Cr17不锈钢母材未发生明显粗化,HAZ宽度不超过250μm,重熔层和熔敷层的组织较母材细小;重熔层和熔敷层比母材具有更高的硬度和更好的耐腐蚀性能。

Process tests for remelting and cladding of ER347 L stainless steel wires by tungsten inert gas arc(TIG)cold welding were carried out on surface of 1 Cr17 stainless steel.The microstructure,microhardness and electrochemical corrosion property in 3.5 wt%NaCl solution of the remelting layer and cladding layer were studied.The results show that for the TIG cold welding remelting,when the cold welding time was in the range of 200-150 ms,150-100 ms,100-50 ms,the required minimum cold welding current for obtaining well-formed remelting layer was 40,70,100 A,respectively.For the TIG cold welding cladding,when the cold welding time was 50,100,160,200 ms,the required minimum cold welding current for obtaining well-formed cladding layer was 230,190,150,120 A,respectively.The grains of heat affected zone(HAZ)formed in TIG cold welding remelting or cladding were not coarsened comparing with those of 1 Cr17 stainless steel base metal,and the HAZ width did not exceed 250μm.The microstructures of the remelting layer and cladding layer were finer than that of the base metal.The microhardness and corrosion resistance of the remelting layer and cladding layer were higher than those of the base metal.