Influence of heating temperature on microstructure and properties of hot stamped steel with Al-Si coating

doi:10.13251/j.issn.0254-6051.2022.10.039

Abstract

Abstract: Influence of heating temperature during hot stamping process on microstructure and properties of 22MnB5 hot stamped steel with Al-Si coating was researched by means of roughness meter, scanning electron microscope, hardness tester and glow discharge atomic emission spectrometer, respectively. The results indicate that with the increase of heating temperature, the migration amount of Fe from hot stamped steel substrate to coating surface along the direction perpendicular to surface becomes larger gradually. Meanwhile, the migration amount of O from coating surface to hot stamped steel substrate along the direction perpendicular to surface becomes larger gradually, and the maximum migration depth is about 2.80 μm. The migration amount of Fe from hot stamped steel substrate to Al-Si coating surface along the direction perpendicular to surface directly determines the morphology, formation position of Fe-Al-Si phase and interface bonding layer thickness. As the heating temperature rises, the surface roughness R_a and peak count value R_pc of Al-Si coating increase at first, and then decrease; when the heating temperature is 930 ℃, the surface roughness R_a and peak count value R_pc reach maximum values of 1.89 μm and 218, respectively. With the increase of heating temperature, the total thickness of Al-Si coating increases from 27.78 μm to 40.46 μm, the thickness of interface bonding layer increases from 1.08 μm to 15.11 μm. When heating temperature is 930 ℃, the hardness of the hot stamped steel substrate reaches maximum value of 505 HV0.2.

Key words: 22MnB5 hot stamped steel, Al-Si coating, heating temperature, element migration, microstructure and properties

CLC Number:

TG156

Chen Zhong. Influence of heating temperature on microstructure and properties of hot stamped steel with Al-Si coating[J]. Heat Treatment of Metals, 2022, 47(10): 228-233.

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