材料工程2019，Vol.47Issue(3)：139-146,8.DOI:10.11868/j.issn.1001-4381.2016.001344
9Cr3W3Co钢高温时效脆化现象与改进方法
Aging embrittlement at high temperature of 9Cr3W3Co steel and its improvement method
摘要
Abstract
The main factor that results in aging embrittlement of 9Cr3W3Co steel was investigated through microstructure observation using scanning electron microscopy (SEM) . The amount of each precipitates under equilibrium state in 9Cr3W3Co steel with different W content (W content is 2.36％, 2.63％, 2.96％ and 3.11％, mass fraction) was calculated using Thermo-Calc software. The microstructure evolution during aging was studied by transmission electron microscopy (TEM) , small angle X-ray scattering (SAXS) and phase analysis method. The results show that the rapid drop of impact toughness after aging for 100 h is caused by the formation of Laves phase. The mass fraction of Laves phase at equilibrium state is mainly determined by the concentration of tungsten. The steel with lower tungsten content exhibits higher impact toughness after aging for 8000 h, meanwhile with the smallest size and the lowest coarsening rate of Laves phase. Thus, the aging embrittlement of 9Cr3W3Co steel can be successfully suppressed by the reduction of tungsten content.关键词
时效脆化/9Cr3W3Co钢/W含量/冲击韧度Key words
aging embrittlement/9Cr3W3Co steel/W content/impact toughness分类
矿业与冶金引用本文复制引用
马龙腾,刘正东,白银..9Cr3W3Co钢高温时效脆化现象与改进方法[J].材料工程,2019,47(3):139-146,8.基金项目
国家能源应用技术研究及工程示范项目(NY201501) （NY201501）
国家高技术研究发展计划(863计划)项目(2012AA03A501) （863计划）
