Microstructure study of laser welding cast nickel-based superalloy K418
Experiments of laser welding cast Nickel-based superalloy K418 were conducted.Microstrueture of the welded seam was char acterized by optical microscopy (OM),scanning electron microscopy (SEM) ,X-ray diffraction (XRD) ,and energy dispersive spec trometer (EDS).Mechanical properties of the welded seam were evaluated by microhardness. The corresponding mechanisms were dis cussed in detail.Results show that the laser welded seam have non-equilibrium solidified microstructures consisting of Cr-Ni-Fe-C austen ite solid solution dendrites as the dominant and some fine and dispersed Ni3 (Al,Ti) ? phase as well as little amount of MC needle car bides and particles enriched in Nb,Ti and Mo distributed in the interdendritic regions,cracks originated from the liquation of the low melting points eutectics in the HAZ grain boundary are observed,the average microhardness of the welded seam and HAZ is higher than that of the base metal due to alloy elements redistribution of the strengthening phaseγ.
nickel-based superalloy needle carbides cracks microhardness
PANG Ming TAN Jiansong WANG Jianping WU Bo JIE Zhimin
Substation China North Engine Research Institute,Langfang 065000,China Substation China North Engine Rearch Institute,Langfang 065000,China
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
297-301
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）