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| Effect of heating rate on coating microstructure of galvanized hot-formed steel |
| LI Xue-tao1,2,3，ZHANG Jie1，JIANG She-ming1，ZHANG Qi-fu1， XU De-chao2,3，TENG Hua-xiang2,3 |
（1. National Engineering Laboratory of Advanced Coating Technology for Metals， Central Iron and Steel Research Institute，Beijing 100081， China
2. Research Institute of Technology， Shougang Group Co.， Ltd.， Beijing 100043， China
3. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology，Beijing 100043， China） |
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Abstract The morphology and microstructure of zinc coating of the galvanized hot-formed steel，before and after hot treatment at different heating rate，were studied by scanning electron microscopy （SEM） with energy dispersive spectrometer system （EDS） and glow discharge optical emission spectroscopy （GDOES）. The results showed that the coating mainly consisted of Γ phase and α-Fe（Zn），with the heating rate reduced，the content of α-Fe（Zn） phase in the coating gradually increased，the content of Γ phase in the coating gradually reduced. When the heat rate was at 5-15 ℃/s，the coating was almost entirely α-Fe（Zn）. With heating rate reduced mass percent of Fe and thickness of alloyed coating increased and the distribution of Fe and Zn was more uniformity. When samples heated to 900 ℃ with 5-15 ℃/s heating rate，the generation of Liquid-Metal-Induced-Embrittlement（LMIE） cracks during hot stamping could be effectively reduced.
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Received: 19 March 2018
Published: 20 November 2018
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2018, Vol. 53 
