T92钢700℃高温时效组织与性能  

Microstructure and mechanical properties of P92 steel aged at 700 ℃

作　　者：顾宝兰[1,2] 董建新[1] 徐彤[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国特种设备检测研究院,北京100029

出　　处：《材料热处理学报》2015年第8期126-132,共7页Transactions of Materials and Heat Treatment

基　　金：国家"十二五"04课题(2011BAK06B04)

摘　　要：对T92钢在700℃,时间为200、500、800、1000 h的高温时效处理后材料的显微组织和力学性能(包括拉伸性能、冲击性能和硬度)进行研究,同时与供货态T92钢的性能和组织进行比较。试验结果表明,T92钢在700℃时效过程中,强度和硬度值均有所下降,但下降幅度不大;而冲击吸收能量显著下降,和原始试样相比,时效1000 h后,冲击能量下降约26%。显微组织观察结果表明,时效过程中T92钢仍保持马氏体板条形貌,但随着时效时间的延长,马氏体板条宽化,且有亚晶出现。交货态显微组织中的析出相类型主要为M23C6型碳化物,时效过程中,M23C6型碳化物晶界析出并长大,是冲击吸收能量下降的主要因素,MX相在时效过程中数量增加但粗化不明显,时效500 h后Laves相析出,但数量很少,在时效后期有所粗化,数量没有增加。The evolution of microstructure and mechanical properties of P92 steel aged at 650 ℃ with different time of 200,500, 800, 1000 h was studied respectively. Microstructure and mechanical properties were compared between original sample and aged samples. The results show that the strength and hardness of T92 steel are reduced slightly with the increasing aging time, and the impact energy decreases about 26% after aging for 1000 h compared with the original sample. The microstructural of T92 steel during aging is mainly precipitation of M23C6 phases at the prior austenite grain boundaries and martensite lath boundaries, and the number and size of M23C6 phase growing with the increasing aging time, that is the mainly reason of the decreasing of impact energy. MX phase is stable during the aging process, except the increase of the number. There is less number of Laves phase discovered after aging for 500 h, with the increasing of aging time, the Laves phase growing but the number has not been changed.

关 键 词：T92钢 高温时效 M23C6型碳化物 LAVES相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]