Research On High Temperature Oxidation Corrosion Resistance Of Heat Resistant Martensitic Steel 1Cr11Ni2W2MoV Hot-dipped Al-Si-Re Alloy

In order to improve application temperature of aerial engine blade materials heat resistant martensitic steel 1Cr11Ni2W2MoV, it was hot-dipped Al-6%Si-4%Re. According to GB/T13303-91 criterion, 1Cr11Ni2W2MoV steel with coating and without coating was oxygenated at 700℃ for 600h.This article researched systemically on the composition, the microstructure and the surface of 1Cr11Ni2W2MoV steel with coating and the reason of coating invalidation after observing with SEM, EMPA, OM.According to Wanger oxidation experience formula, using the scatter date simulation computing method had gained tow oxidation kinetics equations: one is W=0.117t⁰.333(with coating), the other is W=0.0902t⁰.408(raw materials). Oxidation kinetics curve is drawn by Origin software. Conclusion disclosed these oxidation kinetics curves regularity is similar to parabola regularity. Prosperity of resistance oxidation of hot-dipped steel is better than that of lCrllNi2W2MoV steel without hot-dipped.The research showed the surface of hot-dipped Al-Si-Re lCrllNi2W2MoV heat resistant martensitic steel could obtain compact and uninterrupted α-A1₂O₃ film after it was oxygenated at 700℃ for 600h. It is the barrier that can resist high temperature, oxidation. Phases in its coating changed from Fe₂Al₅ and FeAl₃ into FeAl, which could afforded a lot of Al³+ for forming compact and uninterrupted α -Al₂O₃ film.Si element and alloy element can form the second phase. It is important during high temperature oxidation corrosion. Press wereformed when oxidation film was developing, inanition in the diffussion layer and the surface Ra of raw materials were the cause that A12O3 film had crazed and desquamated .