Study on Microstructure and Properties of H13 Die Steel by Dual Laser Impact Forging
In order to improve the defects of laser cladding coating such as pores and cracks,H13 steel powder coating was prepared by double laser shock forging on the surface of H13 die steel.The effects of different laser shock forging frequencies on the microstructure,phase analysis,residual stress and microhardness of the coating surface were studied.The results show that,compared with laser cladding,the microstructure is more uniform and the grains are finer after double laser shock forging,and the phase structure of the sample coating is not changed.The residual compressive stress is introduced to the surface of the sample by double laser shock forging.With the increase of laser shock forging frequency,the residual tensile stress on the surface of the coating decreases gradually,and gradually transforms into the residual compressive stress,and the surface microhardness also increases gradually.
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