Hastelloy X激光熔覆工艺及组织性能

Microstructure and Mechanical Properties of Laser Cladding Process on Hastelloy X

基于激光熔覆的增材制造方法,研究了镍基超级合金Hastelloy X的组织和力学性能。采用光纤激光器对Hastelloy X粉末进行熔覆试验,通过对激光熔覆工艺参数进行优化,制造了宏观表面无缺陷的Hastelloy X试样。结果表明,与传统锻造Hastelloy X方法相比,激光熔覆方法使材料在制造过程中发生再结晶,出现晶粒尺寸较小的细等轴晶粒,提高了材料的显微硬度和抗拉强度,韧性降低。利用扫描电子显微镜(SEM)对Hastelloy X的拉伸断口进行了分析,研究了Hastelloy X在750℃下的高温拉伸断裂机理,为混合型断裂。

Based on the additive manufacturing method of laser cladding,microstructures and mechanical properties of the nickel-based superalloy Hastelloy X are studied.The direct energy depositing process uses laser beam to melt powders and to deposit layers of materials for buil-ding components.By optimizing the laser cladding process parameters,a parameter table is finally selected to deposit Hastelloy X without defects at the maximum deposition efficiency.The results show that,compared with as-forged Hastelloy X,the laser cladding process gives rise to recrystallization during continuous deposition,which results in the occurrence of finely equiaxed grains with a smaller grain size and improving of the microhardness and the tensile performance of the the as-deposited specimen,but slightly reduces the plastic deformation of the part.The tensile fracture mechanism of de-posited part at 750℃is ductile-brittle fracture.