Coating structure transformation law of Al-Si coating with different coating weight during heating

doi:10.13251/j.issn.0254-6051.2022.10.041

Abstract

Abstract: Microstructure transformation low of Al-Si coating with different coating weight on hot forming steel after heating at different temperatures for different time was studied by means of SEM and energy spectrum analysis. The results show that the structure of the fully alloyed Al-Si coating with different weight is the same, which is composed of diffusion layer, Fe-Al layer, Fe-Al-Si layer and Fe-Al surface layer from substrate to surface. With the heating going on, the thickness of the Fe-Al-Si layer and the diffusion layer gradually increases, and the Si content in the Fe-Al-Si layer gradually decreases, meanwhile, the thick coating AS150 does not appear the reduction in the number of coating layers, while the thin coatings AS40 and AS80 appear the reduction in the number of coating layers. Considering the coating structure, properties change and the using requirements of Al-Si coating on hot-forming steel, when using 22MnB5 steel with thickness of 1.4 mm as the base material, the optimal heating process for the thin coating AS40 and AS80 is heating at 900-930 ℃ for 3-6 min, and for the thick coating AS150 is heating at 900-930 ℃ for 4-6 min.

Key words: hot forming steel, aluminum-silicon coating, coating weight, coating structure, heating

CLC Number:

TG156.34

Zhou Shilong, Ye Shengwei, Deng Lulu, Deng Zongji, Lu Qianqian, Zheng Xiaofang. Coating structure transformation law of Al-Si coating with different coating weight during heating[J]. Heat Treatment of Metals, 2022, 47(10): 238-245.

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