航空材料学报2011，Vol.31Issue(5)：71-76,6.DOI:10.3969/j.issn.1005-5053.2011.5.014
一种热连轧GH4169合金的蠕变行为与断裂机制
Creep Behavior and Fracture Mechanism of HCR GH4169 Superalloy
摘要
Abstract
By means of the creep curves measurement and microstructure observation, the creep behavior and fracture mechanism of HCR + DA GH4169 nickel-base superalloy are investigated. Results show that microstructure of HCR GH4169 alloy consists of the γ',γ" phase and γ matrix, and possessing in the fine grains in which exists significant amount of dislocations and twinning. After direct aged treated, the quantities of the dispersed fine y" phase increases and the alloy retains the effect of the deformed strenghtening during hot continuous rolling, which is thought to be the main cause of the alloy possessing a longer creep lifetime under the applied stress of 725 Mpa at 650℃ . During creep, the deformation features of the alloy are twining and double orientation slipping of the dislocations. As the creep goes on, significant amount of dislocations is plied up the regions near the boundaries to bring out the stress concentration , which results in the initiation and propagation of the micro-cracks along the boundaries up to rupture.关键词
热连轧GH4169合金/直接时效/蠕变/断裂机制Key words
CH4169 alloy, hot continuous rolling, direct aging, creep, fracture mechanism分类
金属材料引用本文复制引用
李振荣,田素贵,赵忠刚,陈礼清,刘相华..一种热连轧GH4169合金的蠕变行为与断裂机制[J].航空材料学报,2011,31(5):71-76,6.基金项目
国家自然科学基金资助的重点项目:50634030 （）
