22MnB5热成形钢铝硅镀层的制备工艺及抗氧化性能研究
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摘要
随着汽车工业对轻量化和安全性要求的提高,热成形高强钢在汽车领域的应用越来越广泛。针对22MnB5钢在热成形过程中表面易氧化和脱碳的问题,通过热浸镀Al-Si镀层提高热成形钢的抗高温性能。结果表明:当浸镀温度为700℃、浸镀时间为5 s时,22MnB5钢表面Al-Si镀层厚度约为40μm,其中Al-Si镀层截面组织由铝基固溶体、Fe-Al-Si三元合金和Fe-Al二元合金相三层组成。相比于原始钢板,热浸镀Al-Si镀层的22MnB5钢的抗高温氧化能力大幅改善,在900℃保温时其氧化增重速率约为0.11g/(m2·min)。
With the improvement of automobile industry for lightweight and security, the application of hot forming high strength steel in automobile field is becoming more and more widespread. As 22 MnB5 steel is easily oxidated and decarbarized during hot forming process, the Al-Si coating was prepared for hot forming steel to improve its oxidation resistance. The results show that when the dip temperature is 700 ℃ and dip time is 5 s, the thickness of Al-Si coating on the surface of 22 MnB5 steel is about 40 μm. The section microstructure of Al-Si coating consists of three layers of aluminum matrix solid solution, Fe-Al-Si ternary alloy and Fe-Al binary alloy phase. Compared with that of original steel, the high temperature oxidation resistance of 22 MnB5 steel with hot dip Al-Si coating greatly improve, and its oxidation mass increasing rate is about 0.11 g/(m~2·min) at 900 ℃.
With the improvement of automobile industry for lightweight and security, the application of hot forming high strength steel in automobile field is becoming more and more widespread. As 22 MnB5 steel is easily oxidated and decarbarized during hot forming process, the Al-Si coating was prepared for hot forming steel to improve its oxidation resistance. The results show that when the dip temperature is 700 ℃ and dip time is 5 s, the thickness of Al-Si coating on the surface of 22 MnB5 steel is about 40 μm. The section microstructure of Al-Si coating consists of three layers of aluminum matrix solid solution, Fe-Al-Si ternary alloy and Fe-Al binary alloy phase. Compared with that of original steel, the high temperature oxidation resistance of 22 MnB5 steel with hot dip Al-Si coating greatly improve, and its oxidation mass increasing rate is about 0.11 g/(m~2·min) at 900 ℃.
引文
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