激光功率对Inconel718和316L异种激光焊接头组织及性能的影响  

Effect of laser power on microstructure and properties of Inconel718 and 316L dissimilar laser welded joint

作　　者：冀宣名 赵丹 邓平 JI Xuan-ming;ZHAO Dan;DENG Ping(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《材料热处理学报》2023年第12期168-175,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51974097,52161010);贵州省科技支撑计划(2022-050);贵州大学培育项目(2020-21)。

摘　　要：针对Inconel718镍基合金与316L不锈钢异材焊接易出现气孔、裂纹、脆化等现象,采用不同的激光功率对它们进行激光焊接试验,研究了激光功率对接头组织和性能的影响。结果表明:采用激光功率在2.4~3.0 kW范围且氩气氛围辅助的激光焊接可得到宏观成型、微观组织致密性良好,无可视宏观缺陷的Inconel718/316L接头,熔池面积随激光功率增大而增大;Laves相在焊缝区析出,消耗基体内的强化元素,引起焊缝显微硬度的降低,接头显微硬度呈阶梯状分布,Inconel718母材最高,焊缝次之,316L母材最低;激光功率为2.4 kW时,接头具有最高的抗拉强度,为689 MPa,随激光功率的继续增大,强度降低;接头的耐蚀性受焊缝晶粒尺寸与Laves相的影响,表现为2.4 kW>2.2 kW>(2.6~3.0) kW。In order to solve the problems of gas pores,cracks and embrittlement in the welding of Inconel718 nickel based alloy and 316L stainless steel,laser welding tests was carried out for them at different laser powers,and the effect of laser power on microstructure and properties of the joints was studied.The results show that the Inconel718/316L joints with good macroscopic formation,dense microstructure and no visible macroscopic defects can be obtained by laser welding assisted by argon atmosphere with laser power ranging from^(2).4 to 3.0 kW,and the weld pool area increases with the increase of laser power.Laves phase precipitates in the weld zone,consuming the strengthening elements in the matrix and causing a decrease in the microhardness of the weld.The microhardness of the joint is distributed in a stepped pattern,with Inconel718 base metal being the highest,followed by the weld,and 316L base metal being the lowest.When the laser power is 2.4 kW,the joint has the highest tensile strength of 689 MPa.As the laser power continues to increase,the strength decreases.The corrosion resistance of the joint is influenced by the grain size of the weld and the Laves phase,manifested as 2.4 kW>2.2 kW>(2.6-3.0)kW.

关 键 词：IN718/316L接头 激光焊接 激光功率 LAVES相 接头性能 

分 类 号：TG456.7[金属学及工艺—焊接]