Effect of deformation-induced martensite on the microstructure, mechanical properties and corrosion resistance of X5CrNi18-8 stainless steel

摘要

Purpose: The aim of this work was to improve the properties of the surface layer of the MCMgAl12Zn1 cast magnesium alloy. This improvement can be achieved by modification of surface layer microstructure by melting and simultaneous feeding the silicon carbide particles into the weld pool. Design/methodology/approach: Laser alloying of the MCMgAl12Zn1 magnesium alloy with the silicon carbide was carried out using high power diode laser HPDL (High Power Diode Laser) with changing process parameters like laser power and scan rate. The structure examination was carried out using the light microscopy and SEM (scanning electron microscopy). The qualitative and quantitative chemical and phase composition were determined by the X-ray diffraction method using the XPert device, TEM (transmission electron microscopy) and EDS (electron dispersive spectroscopy) analysis. Findings: Microstructure and phase composition of the MCMgAl12Zn1 cast magnesium alloy after laser surface treatment are presented in this paper. Research limitations/implications: The investigations were conducted for cast magnesium alloy MCMgAl12Zn1, which was remelting and simultaneous feeding the silicon carbide particles into the weld pool. Size of SiC particles was below 75 μm. One has used laser power in the range from 1.2 to 2.0 kW. Practical implications: The results obtained in this investigation were promising comparing with the other conventional processes. High Power Diode Laser can be used as an economical substitute of Nd: YAG and CO2 to improve the surface magnesium alloy by feeding the carbide particles. Originality/value: The value of this paper is to define the influence of laser treatment parameters on quality, microstructure and microhardness of magnesium cast alloys surface layer.