摘要
研究了700℃超超临界锅炉管用617B合金在720℃/10 000 h、800℃/2000 h和850℃/100 h时效和不同温度50 h时效过程中组织稳定性及力学性能变化。结果表明:617B合金在10 000 h长期时效末期组织稳定性较差,γ′相粗化且晶界上有有害相析出;温度对617B合金的组织稳定性影响较大,随着温度升高γ′相急剧粗化,晶内析出相发生转变;合金的硬度主要受γ′相析出规律的影响;720℃时效过程中晶内有拉链状析出相,其种类、结构有待进一步研究。
The microstructure stability and mechanical properties of alloy 617 B after 720 ℃/10 000 h, 800 ℃/2000 h and 850 ℃/100 h aging and short term aging at different temperatures were studied. The results show that the microstructure stability of alloy 617 B after aging at 720 ℃ for 10,000 h is relatively poor, γ′ phase coarsens and harmful phase precipitates on grain boundary. Aging temperature has an impact on the microstructure stability of alloy 617 B. γ′ phase coarsens rapidly with the increasing of aging temperature and the intragranular precipitates are transferred. The hardness of alloy 617 B is mainly influenced by the precipitation rule of γ′ phase. There are zipper-like precipitates in grains during 720 ℃ aging while the structure of phase needs further study.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第4期982-989,共8页
Rare Metal Materials and Engineering
基金
国家高技术研究发展计划("863"计划)(2012AA03A501)
关键词
超超临界
时效
组织稳定性
ultra-supercritical
aging
microstructure stability
