高温时效对P91钢组织及硬度的影响  

Effect of high temperature aging on microstructure and hardness of P91 steel

作　　者：张开 王学[1] 倪满生 刘俊建 杜成超 Zhang Kai;Wang Xue;Ni Mansheng;Liu Junjian;Du Chengchao(School of Power and Machinery,Wuhan University,Wuhan Hubei 430072,China;Da Tang East China Electric Power Test&Research Institute,Hefei Anhui 230088,China;School of Materials Science&Engineering,Jiangsu University,Zhenjiang Jiangsu 212013,China)

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]大唐华东电力试验研究院,安徽合肥230088 [3]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《金属热处理》2022年第12期7-12,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(52174370)。

摘　　要：对P91钢进行了650℃×2935 h的时效试验,测试了时效过程中的硬度变化,并分析了显微组织变化对硬度的影响。结果表明,在时效前期,由于M_(23)C_(6)的析出,导致硬度略有上升。在后续的时效中,M_(23)C_(6)发生熟化,数量密度降低;同时,亚晶缓慢长大,位错密度略微降低,使P91钢的硬度缓慢下降。根据时效过程中的组织和硬度变化,可以预测P91钢在不超过600℃的条件下服役时,有较好的组织和性能稳定性。P91 steel was aged at 650℃for 2935 h.The hardness change during aging was measured,and the influence of microstructure change on hardness was analyzed.The results show that in the early aging period,the hardness increases slightly due to the precipitation of M_(23)C_(6).During the subsequent aging,M_(23)C_(6) is matured and its quantity density decreases,at the same time,the hardness of the P91 steel decreases slowly due to the slow growth of sub crystal and slight decrease of dislocation density.According to the changes of microstructure and hardness during the aging process,it can be predicted that the P91 steel has better stability of microstructure and properties when it is in service at the temperature not exceeding 600℃.

关 键 词：P91钢 高温时效 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]