新型含铝奥氏体耐热钢中合金元素作用机制研究现状  

Research status of elements alloying mechanism in alumina-forming austenitic heat-resistant steel

作　　者：谢奇迈 马庆爽 张海莲 李会军[4] 高秋志 XIE Qi-mai;MA Qing-shuang;ZHANG Hai-lian;LI Hui-jun;GAO Qiu-zhi(School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China;Daotian High Technology Co.,Ltd.,Qinhuangdao 066004,Hebei,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300354,China)

机构地区：[1]东北大学秦皇岛分校资源与材料学院,河北秦皇岛066004 [2]轧制技术及连轧自动化国家重点实验室,东北大学,辽宁沈阳110819 [3]秦皇岛市道天高科技有限公司,河北秦皇岛066004 [4]天津大学材料科学与工程学院,天津300354

出　　处：《中国冶金》2022年第7期1-11,19,共12页China Metallurgy

基　　金：国家自然科学基金钢铁联合研究基金重点项目(U1960204);国家自然科学基金面上项目(51871042,52171107)。

摘　　要：为了提高火力发电站的发电效率,有效降低环境污染,需要提高发电机组的工作温度和工作压力。这就对结构用钢提出了更高的要求,令其不仅要在含水蒸气的环境下具有良好的抗腐蚀能力,还要满足高温环境对力学性能的要求。新型含铝奥氏体耐热钢(AFA钢)能在高温下形成连续、致密的Al_(2)O_(3)层,具有比Cr_(2)O_(3)层更好的保护作用;同时,AFA钢基体中会析出MC、Laves和L1_(2)-Ni_(3)Al等多种沉淀相,可有效提高抗蠕变性能,因此AFA钢有望用于火力发电站机组。分析了合金元素添加对AFA钢组织演变、析出相的影响规律,阐述了合金元素在抗蠕变和抗氧化方面的作用机制,并对未来AFA钢合金元素的调整方向作出展望。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 Al_(2)O_(3) scale at high temperature,which has better protective effect than Cr_(2)O_(3) scale.Multiple Precipitation phases such as MC,Laves,L1_(2)-Ni_(3)Al,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.

关 键 词：含铝奥氏体耐热钢 合金元素 析出相 抗氧化性能 力学性能 

分 类 号：TG142.73[一般工业技术—材料科学与工程]