[논문]Al-Si 도금강의 통전 가열에 따른 미세조직과 도금층 변화

정우창

doi:10.12656/jksht.2021.34.3.107

Al-Si 도금강의 통전 가열에 따른 미세조직과 도금층 변화
Change in Microstructure and Coating Layer of Al-Si Coated Steel after Conductive Heating 원문보기

열처리공학회지 = Journal of the Korean society for heat treatment, v.34 no.3, 2021년, pp.107 - 115

Abstract ▼ AI-Helper

Al-Si coated boron steel has been widely used as commercial hot stamping steel. When the steel is heated at 900~930℃ for 5 min in an electric furnace, thickness of the coating layer increases as a consequence of formation of intermetallic compounds and diffusion layer. The diffusion layer plays an important roll in blunting the propagation of crack from coating layer to base steel. Change in microstructure and coating layer of Al-Si coated boron steel after conductive heating with higher heating rate than electric furnace has been investigated in this study. Conductive-heated steel showed the martensitic structure with vickers hardness of 505~567. Both intermetallic compounds in coating layer and diffusion layer were not observed in conductive-heated steel due to rapid heating. It has been found that the conductive-heating consisting of rapid heating to 550℃ which is lower than melting point of Al-Si coating layer, slower heating to 900℃, and then 1 min holding at 900℃ is effective in forming intermetallic compound in coating layer and diffusion layer.

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표/그림 (10)

표 Table 1. Chemical compositions of steel SABC1470 (wt.%)
그림 Fig. 1. Schematic diagram showing concept of conductive heating and apparatus for conductive heating used in this study.
그림 Fig. 2. Optical and SEM micrographs showing coating layer and microstructure of Al-Si coated boron steel before and after hot stamping.
그림 Fig. 3. Optical micrographs showing coating layer and microstructure after conductive heating followed by water quenching in Al-Si coated boron steel cut into rectangular blank.
그림 Fig. 4. Optical micrographs showing coating layer and microstructure after conductive heating followed by water quenching in Al-Si coated boron steel cut into rectangular blank.
그림 Fig. 5. Optical micrographs showing difference in substructure and coating thickness of coating layer between conductive-heated steel(a : location 3 of Fig. 3 and b : location 7 of Fig. 4) and commercially hot-stamped steel(c), and SEM micrograph and EDS result for locations 1 and 2 of Fig. 5(b).
그림 Fig. 6. Effects of heating rate and heating temperature on appearance of coating layer of Al-Si coated boron steel.
그림 Fig. 7. Effect of heating rate between 550℃ and 900℃ on appearance of coating layer of Al-Si coated boron steel.
그림 Fig. 8. Secondary electron and back scattered electron images showing effect of holding time at 900℃ on coating and diffusion layers in Al-Si coated boron steel.
그림 Fig. 9. Secondary electron and back scattered electron images showing effects of holding time at 900℃ and heating rate on coating and diffusion layers in Al-Si coated boron steel.

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