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| Research status of elements alloying mechanism in alumina-forming austenitic heat-resistant steel |
| XIE Qi-mai1,2, MA Qing-shuang1,2, ZHANG Hai-lian3, LI Hui-jun4, GAO Qiu-zhi1,2 |
1. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China;
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China;
3. Daotian High Technology Co., Ltd., Qinhuangdao 066004, Hebei, China;
4. School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China |
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Abstract In order to improve the power generation efficiency of thermal power plants and effectively reduce environmental pollutions, it is necessary to increase the operating temperature and operating pressure of the thermal power unit. This puts forward higher requirements for structural steel, not only to possess good corrosion resistance in an environment with water vapor, but also to meet the requirement for mechanical properties at high temperatures. Alumina-forming austenitic (AFA) stainless steel possesses the ability to form a continuous and dense protective Al2O3 scale at high temperature, which has better protective effect than Cr2O3 scale. Multiple Precipitation phases such as MC, Laves, L12-Ni3Al, etc. precipitate in the matrix of AFA steel, which can effectively improve the creep resistance. Therefore, AFA steel is expected to be used in thermal power station unit. Effects of alloying elements addition on microstructure evolution and precipitation phases in AFA steel are analyzed, and effects of alloying elements on creep and oxidation resistance are expounded. The future adjustment direction of alloying elements in AFA steel is prospected.
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Received: 13 December 2021
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2022, Vol. 32 
