T91钢高温运行下碳化物粗化行为的研究  

Research on Coarsening Behavior of Carbides in T91 Steel During High-temperature Services

作　　者：万强[1] 陈林 万金 罗畅[1] 

机构地区：[1]武汉大学动力与机械学院,武汉437000 [2]中电投江西核电有限公司,江西九江332000 [3]广东拓奇电力技术发展有限公司,广东东莞523000

出　　处：《动力工程学报》2015年第4期331-335,共5页Journal of Chinese Society of Power Engineering

基　　金：中央高校基本科研业务费专项基金资助项目(2014208020202)

摘　　要：通过对实际电厂运行的T91钢进行金相观察、扫描电子显微镜(SEM)分析,从微观组织变化查看T91钢长期高温环境下的老化状况,同时对供货态的T91钢进行研究作为对比.在定量金相法的数据基础上,得到了T91钢扩散速度控制的长大动力学方程.结果表明:T91钢经过长时间服役后,碳化物颗粒在晶界处发生聚集,同时颗粒逐渐粗大,使得晶内碳化物数量减少,强化效果降低.To investigate the aging behavior of T91 steel after long-term high-temperature services,the microstructure of T91 samples taken from an actual power plant was analyzed by optical microscopy(OM)and scanning electron microscopy(SEM),of which the results were compared with that of as-received T91 steel.Moreover,the growth equation of carbides in T91 steel was proposed based on the general growth equation and the data of quantitative metallography.Results show that after a long-term service of T91,the carbide particles gather and get coasening in the grain boundary,resulting in reduced quantity of carbides in grains,and accordingly weakened strengthening effect.

关 键 词：T91钢 老化 碳化物粗化 粗化曲线 

分 类 号：TG142.11[一般工业技术—材料科学与工程]