(1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) (2. Department of Mechanical Engineering, Tongling University, Tongling 244000, China)
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Abstract:
This paper introduces a new class of high temperature oxidation resistant austenitic heat resistant steels which offer a continuous, stable, spontaneous dense layer of alumina with superior high temperature oxidation resistance and creep resistance to conventional chromia(Cr2O3) forming stainless steels. Detailed analyses of the oxidation mechanisms and alloying effects on the oxidation behavior of these newly developed alumina forming steels at high temperatures in air with 10% water vapor were presented. It was also found that the creep resistance and high temperature mechanical properties for these heat resistant austenitic steels were improved due to precipitations of stable nanosized NbC , Fe 2Nb and NiAl precipitates at elevated temperatures.