T92钢管长时高温组织稳定性及性能研究  

Mechanical Properties and Microstructure Stability of T92 Steel Tubes After Long-term Exposure to High Temperatures

作　　者：王延峰[1] 郑开云[1] 吾之英[1] 王起江[2] 

机构地区：[1]上海发电设备成套设计研究院,上海200240 [2]宝山钢铁股份有限公司,上海201900

出　　处：《动力工程学报》2010年第4期245-252,共8页Journal of Chinese Society of Power Engineering

基　　金：中国质检公益性行业科研专项资助项目(200810298)

摘　　要：对国产T92钢管进行了650℃高温时效试验、蠕变断裂试验和组织研究.结果表明：经650℃高温时效和蠕变断裂试验后,3种现象同步发生,即位错密度下降、亚晶粒数量增加以及析出相的演变;M23C6型碳化物的迅速粗化长大以及Laves相的析出与粗化主要出现在3 000 h附近;在3 000~10 000 h时效过程中,M23C6型碳化物的长大速率并不明显,形态较稳定,这与Laves相从基体中析出并迅速粗化有关;经10 000 h时效后,T92钢管仍然保持稳定的马氏体板条形态,但蠕变断裂试验后,部分板条马氏体开始向等轴亚晶转变.Aging and creep-rupture tests were carried out to domestic T92 steel tubes at 650℃ while study on corresponding microstructures performed. Results show that after having experienced aging at 650 ℃ and creep-rupture tests, following three phenomena may occur to the material： reduction of dislocation density, increase in sub-grain quantity and evolution of precipitates. After an aging time of 3 000 h, M23C6 precipitates will rapidly get coarsening while Laves phase form and get coarsening. M23 C6 will stop grow- ing and remain its morphology in the duration from 3 000 h to 10 000 h, due to precipitation and rapid coarsening of Laves phase from the matrix. Its martensite structure will still remain in lath morphology af- ter aging up to 10 000 h, but partially transform to equiaxial sub-grains after creep-rupture test.

关 键 词：金属材料 蠕变断裂 组织稳定性 T92钢管 LAVES相 

分 类 号：TG115[金属学及工艺—物理冶金]