扫描路径对激光立体成形GH3536合金显微组织与拉伸性能的影响

Effect of Scanning Path on Microstructure and Tensile Property of GH3536 Alloy Fabricated by Laser Solid Forming

采用金相、XRD、SEM、拉伸等检测手段探究45°交叉光栅式与往复交叉光栅式2种扫描路径对激光立体成形GH3536合金的影响。结果表明,2种扫描路径对成形后的GH3536合金显微组织影响不大。基体都是γ相,并存在M_(23)C6与M_(6)C 2种类型的碳化物。往复交叉光栅式的热量累积稍高于45°交叉光栅式,导致其孔隙率较大,成形高度较高。2种扫描路径的拉伸性能相近,断裂方式均为韧性断裂。裂纹发生在碳化物处,以沿晶断裂为主。

Metallographic microscope,XRD,SEM and tensile testing methods were used to explore the influence of 45°cross grating and zig-zag cross grating scanning paths on GH3536 alloy fabricated by laser solid forming(LSF).The results show that the two scanning paths have little effect on the microstructure of GH3536 alloy.The substrate of GH3536 alloy with two scanning paths areγphase.There are two types of carbides,M_(23)C6 and M6C.The heat accumulation of zig-zag cross grating is slightly higher than that of 45°cross grating,resulting in larger porosity and a higher forming height.The tensile properties of GH3536 alloy with two scanning paths are similar.The fracture mode is ductile fracture.The cracks occurs at the carbide,and are mainly transgranular fracture.