激光选区熔化成形2Cr13不锈钢组织与力学性能研究

Microstructure and Mechanical Properties of 2Cr13 Stainless Steel Using Selective Laser Melting

对2Cr13不锈钢粉末进行激光选区熔化成形研究,开发成形工艺参数,研究不同工艺参数下熔池凝固行为,制备显微组织观察试块及力学性能测试试块,观察成形件显微组织特征并测试成形件布氏硬度、弯曲强度、室温拉伸性能。结果显示,当成形工艺参数为激光功率200 W、层厚30μm、光点间距75μm、曝光时间110μs、线间距115μm时,成形件致密度达99.75%;显微组织无孔洞,成形件纵截面熔池搭接形成鱼鳞状形貌;成形件强度高、塑性差且力学性能表现出各项异性,横向性能与锻件相近,纵向性能较弱。

This work studies selective laser melting of 2Cr13 stainless steel. The main contents include the development of forming process parameters and the solidification behavior of molten pool under different process parameters. Besides, the microstructure observation test blocks are prepared and observed, mechanical property test blocks are prepared and tested, including Brinell Hardness, bending strength and room temperature tensile properties. The results show that when the forming process parameters are set as laser power 200 W, layer thickness 30 μm, spot spacing 75 μm, exposure time 110 μs, line spacing 115 μm, the density of the molded part reaches 99.75%. There is no hole in the formed part and the longitudinal section is lapped in the form of fish scales. The deposited parts have high strength, but the plasticity is poor and the performance shows an anisotropy. The lateral performance is similar to that of the forging but the longitudinal performance is weaker.