摘要
在不同温度下,对P92钢管进行高温持久试验,并根据试验数据外推出其在625℃/10^(5)h的持久强度为103.8 MPa,说明P92钢管具有优异的高温持久性能.分析了P92钢管的金相组织及在高温下的组织演变情况.分析认为,由于P92高温持久试样长时间处于高温环境,马氏体板条发生粗化,板条内位错密度降低,析出相M_(23)C_(6)、MX发生了粗化;同时在高温应力状态下,随时间产生的金属间化合物Laves相降低了材料的持久强度.
The high temperature stress rupture test is conducted at different temperatures to the P92 steel pipe,and based on the data form the test,the 625℃/10^(5)h stress rupture strength is extrapolated to 103.8 MPa,which means that the pipe has excellent high-temperature stress rupture property.Furthermore the metallographic microstructure of the P92 steel pipe at high temperature and the evolution thereof at high temperature are analyzed.And it is revealed via the analysis that due to being long time held under a high temperature condition,the high-temperature stress ruptures test specimen of the P92 pipe has such microstructure changes as coarsening of martensite lath and coarsening of precipitation phases of M_(23)C_(6) and MX;and meanwhile,the time-caused intermetallic compound(IMC),the Laves phase is developed in the high temperature stress state,and thus the creep rupture strength of the material is reduced.
作者
李进
陈桂
张剑楠
LI Jin;CHEN Gui;ZHANG Jiannan(Yangzhou Chengde Steel Pipe Co.,Ltd.,Yangzhou 225215,China;School of Materials Science and Engineering,Nanjing University of Science&Technology,Nanjing 210009,China)
出处
《钢管》
CAS
2022年第1期30-33,共4页
Steel Pipe
关键词
钢管
P92
持久强度
组织
析出相
steel pipe
P92
creep rupture strength
microstructure
precipitation phase
