选区激光熔化对GCr15高碳钢成形性能的研

Study on Effect of Selective Laser Melting on Formability of GCr15 High Carbon Steel

以等离子旋转电极制备的GCr15高碳钢粉末为实验原料,采用选区激光熔化(SLM)制备GCr15高碳轴承钢。研究了SLM成形过程中激光功率、扫描速度、体能量密度对GCr15成形性能的影响和成形后的组织转变。实验结果表明,在参数可调节的范围内,激光功率、扫描速度、体能量密度与相对密度呈线性关系。从能量密度曲线可以看出,功率对相对密度的影响大于扫描速度;在低功率情况下,会出现功率与相对密度关系失真;同时,选区激光熔化制备GCr15轴承钢的组织细小、均匀,主要为粗针状的马氏体和残余奥氏体,随着能量密度的增加,残余奥氏体的含量有所增加。

The GCr15 high carbon steel powder prepared by plasma rotating electrode was used as the experimental raw material and prepared by selective laser melting(SLM).The effects of laser power,scanning speed,and volume energy density on the formability of GCr15 and the structure transformation after forming during SLM forming process were studied.Experimental results show that the laser power,scanning speed,volume energy density,and relative density are in a linear relationship within the adjustable range of parameters.It can be seen from the energy density curve that the power has a greater effect on the relative density than the scanning speed.In the case of low power,the relationship between the power and the relative density will be distorted.At the same time,the microstructure of GCr15 bearing steel prepared by selective laser melting is small and uniform mainly consisting of coarse needle-like martensite and retained austenite.With the increase of energy density,the content of retained austenite increases.