Influence of heating parameters on properties of the Al-Si coating applied to hot stamping

查看全文 作　　者：LIANG [1,2]WeiKang;TAO [1,2]WenJie;ZHU [1,2]Bin;ZHANG [1,2]YiSheng

机构地区：[1]College of Materia&Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;[2]State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Science China(Technological Sciences)》索引2017年第60卷第7期,共15页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51275185,51405171,U1564203) 摘　　要：The Al-Si coating of ultra-high strength steel has been applied to hot stamping more and more widely, owing to solving the problem of oxidation and decarburization. However, the evolution of Al-Si coating during the heating process was rarely studied in the previous study. The tests about the influence of heating parameters, such as heating temperature, heating rates and dwell time, on properties of the Al-Si coating were carried out on the Gleeble-3500 thermal simulator. The properties of the Al-Si coating, for instance, volume fraction of FeAl intermetallics, α-Fe layer as well as porosity and 3D surface topography, were explored in the study. Results showed that more and more Kirkendall voids and cracks appeared in the Al-Si coating when the heating temperature exceeded 600°C. The heating rates almost had no influence on properties of the Al-Si coating when the temperature was equal to or lower than 500°C. The volume fraction of FeAl intermetallics in the coating with dwell time from 3 s to 8 min at 930°C was0, 6.19%, 17.03% and 20.65%, separately. The volume fraction of the α-Fe layer in the coating changed from zero to 31.52%with the prolonged dwell time. The porosity of the coating ranged from 0.51% to 4.98% with the extension of dwell time. The unsmooth degree of the surface of the coating rose gradually with the increasing of heating rates and the extension of dwell time.The 3D surface topography of the coating was determined by the comprehensive effect of atoms diffusion, new formed phases,surface tension and the degree of oxidation of the coating surface. Experiments indicated that rapid heating was not suitable for the coating when the temperature exceeded 500°C. Experiments also demonstrated that enough dwell time was essential to obtain the superior properties of the coating. 关键词：涂层性能热冲压加热参数铝硅 AL-SI涂层三维表面形貌热模拟试验机金属间化合物

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Influence of heating parameters on properties of the Al-Si coating applied to hot stamping

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