文章信息/Info

Title:

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

作者:

徐向棋; 呂昭平

北京科技大學 新金屬材料國家重點實驗室��
銅陵學院機械工程系

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)

關鍵詞:

奧氏體; 耐熱鋼; 氧化鋁;  抗氧化; 抗蠕變

文獻標志碼:

A

摘要:

    新一代奧氏體耐熱鋼在氧化過程中自發形成連續、穩定、致密的氧化鋁層，與傳統的在金屬表面形成Cr2O3保護層的不銹鋼相比，具有更優異的高溫抗氧化性能和良好的抗蠕變能力。詳細地分析了新型抗高溫氧化奧氏體耐熱鋼的抗氧化機理，并且探討了一些合金元素對新型奧氏體耐熱鋼在高溫含10%水蒸氣的氣氛中抗氧化性能的影響。指出新一代奧氏體耐熱鋼在氧化過程中形成穩定的納米級沉淀相NbC，以及在高溫時形成的穩定Fe2Nb和NiAl沉淀相，有力地改善了其抗蠕變性能和高溫力學性能。最后展望了這類以Al2O3為抗氧化層的新型奧氏體耐熱鋼的應用前景。

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.