材料工程2018，Vol.46Issue(2)：128-133,6.DOI:10.11868/j.issn.1001-4381.2016.000891
DD6单晶高温合金振动疲劳性能及断裂机理
Vibration Fatigue Properties and Fracture Mechanism of DD6 Single Crystal Superalloy
摘要
Abstract
Room Temperature vibration fatigue S-N curves of single crystal superalloy DD6 with [001] orientation was investigated and room temperature vibration fatigue limit was obtained .The fracture mechanism was studied by OM ,SEM and EBSD .The results show that based on S-N method ,vibra-tion fatigue limit of DD6 single crystal superalloy with [001] orientation is estimated to be around 337 .5M Pa .Vibration fatigue fracture presents single or several {111} octahedral slip planes .SEM observations show that fracture has two regions :fatigue source region and the fatigue crack propaga-tion regions ,the fatigue cracks initiate at the surface or internal defect of the cross-section with the maximum stress ,and exhibits a single source feature ,fatigue crack propagation region exhibits quasi-cleavage fracture ,no typical fatigue striation feature .Crystal plane slip along {111} is the main de-formation mechanism of RT vibration fatigue fracture of single crystal superalloy DD 6 ,quasi-cleavage propagation plane in fracture and quasi-cleavage patterns in microstructure are the main features of RT vibration fatigue fracture of single crystal superalloy DD 6.关键词
DD6单晶高温合金/振动疲劳/断裂机理/类解理平面Key words
DD6 single crystal superalloy/vibration fatigue/fracture mechanism/quasi-cleavage plane分类
航空航天引用本文复制引用
刘丽玉,高翔宇,杨宪锋,何玉怀..DD6单晶高温合金振动疲劳性能及断裂机理[J].材料工程,2018,46(2):128-133,6.基金项目
航空基金资助项目(2014ZF21014) （2014ZF21014）
