Three-Dimensional Microstructure and Properties of Cx Stainless Steel Formed by Selective Laser Melting

In this paper, the three-dimensional microstructure and anisotropy of CX stainless steel formed by selective laser melting were studied by means of optical microscope, X-ray diffractom-eter, scanning electron microscope and electron back-scattered diffractometer technique. The results show that the temperature gradient and high cooling rate have an important influence on the microstructure and anisotropy of SLM formed CX stainless steel. CX stainless steel is mainly composed of a large amount of martensite structure and a small amount of austenite phase struct-ure, and the three-dimensional microstructure is obviously different. In the three-dimensional section, the texture of <110> crystal orientation in XOZ plane is the strongest, followed by YOZ, and the specific orientation of grains in XOY plane is the weakest. In comparison, the XOZ plane has the best mechanical properties, and its tensile strength, yield strength, elongation and microh-ardness reach 1045.29 MPa, 829.51 MPa, 16.70% and 364.89 HV, respectively.