摘要
奥氏体耐热钢在高温和高应力条件下长期服役后,会发生材质老化和蠕变损伤,在这一过程中由于奥氏体钢中相结构的变化而使其磁性能发生了显著变化。此外,高温服役后随着合金碳化物和σ相的析出,在析出相周围产生贫Cr区,使这些区域合金成分发生显著变化致使马氏体起始形成温度(Ms)上升,在冷却至室温后转变为马氏体,会引起耐热钢磁性能的显著变化。对此,通过测量合金中马氏体相的成分,利用磁性测量方法可评估奥氏体耐热钢长期高温服役后的老化程度。
The austenitic heat - resisting steel will be aged and damaged by creep after long - term service under high temperature and high stress. This process is accompanied with remarkable change of magnetic property due to phase transformation in said steel. In addition, the precipitation of metallic carbides and σ phase after service under high temperature makes Cr depletion areas appeared around the precipitated phase,resulting in remarkable change of the composition in alloy,and makes Ms （initial temperature for formation of Martensite steel） to rise,and the Martensite transformation occurred after cooling to room temperature, leading to remarkable change of magnetic property in heat - resisting steel. For this. through measuring the Martensite phase composition in alloy, the evaluation of aged degree for austenitic heat - resisting steel after long - term service under high temperature can be carried out by adopting the magnetic property measuring method.
出处
《热力发电》
CAS
北大核心
2009年第12期33-35,共3页
Thermal Power Generation
关键词
奥氏体耐热钢
高温
高应力
马氏体
磁性
劣化
austenitic
heat - resisting steel
high temperature and high stress
long - term service
Martensite
magnet ic property
degradation
