Effects of heat treatment on microstructure and friction wear performance of SLM H13 steel
The impact of heat treatment on the microstructure and tribological performance of H13 tool steel fabri-cated via selective laser melting(SLM)technology is systematically investigated.Research was conducted focusing on two heat treatment temperatures,780℃and 830℃,to study their effects on the microstructure and tribological properties of SLM-H13 steel.Material characterization was conducted using Electron Backscatter Diffraction(EBSD),microhardness testing,and friction wear tests.The findings indicate that heat treatment significantly alters the material's microstructure,with samples treated at 780℃and 830℃displaying different structural evolu-tions,leading to varied wear performances.At room temperature,untreated SLM-H13 steel exhibits fine cellular grids and columnar crystal structures,typical of the rapid solidification process in SLM,and shows superior tribologi-cal performance with a lower coefficient of friction and wear rate,primarily through abrasive wear mechanisms.Sys-tematic analysis of samples treated at 780℃and 830℃revealed that heat treatment markedly changes the microstruc-ture of SLM-H13 steel,primarily evident as the gradual disappearance of melt pool boundaries,grain coarsening,and uniform reorganization of grain boundaries.Additionally,there was a transformation in the crystal orientations of residual austenite and martensite.These microstructural changes directly impact the tribological performance,mani-fested by increased wear rates at 780℃and 830℃compared to the untreated samples,with wear mechanisms includ-ing abrasive and fatigue wear,and characteristics of oxidative wear becoming apparent with increased treatment tem-perature.While appropriate heat treatment can modify the microstructure of SLM-H13 steel,its effect on enhancing wear performance is limited,providing critical insights into the micro-mechanisms for the application of SLM H13 steel under harsh operating conditions.
selective laser meltingH13 Steelheat treatmentresidual austenite and martensitefriction wear
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