新一代新型抗高温氧化奥氏体耐热钢的研究进展-中国材料进展

文章信息/Info

Title:: Research Progress on a New Class of High Temperature Oxidation Resistant Austenitic Heat Resistant Steels

Author(s):: XU Xiangqi; LU Zhaoping; (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)

摘要:: 新一代奥氏体耐热钢在氧化过程中自发形成连续、稳定、致密的氧化铝层，与传统的在金属表面形成Cr2O3保护层的不锈钢相比，具有更优异的高温抗氧化性能和良好的抗蠕变能力。详细地分析了新型抗高温氧化奥氏体耐热钢的抗氧化机理，并且探讨了一些合金元素对新型奥氏体耐热钢在高温含10%水蒸气的气氛中抗氧化性能的影响。指出新一代奥氏体耐热钢在氧化过程中形成稳定的纳米级沉淀相NbC，以及在高温时形成的稳定Fe2Nb和NiAl沉淀相，有力地改善了其抗蠕变性能和高温力学性能。最后展望了这类以Al2O3为抗氧化层的新型奥氏体耐热钢的应用前景。

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.