摘要
采用扫描电镜、背散射电子衍射、透射电镜等手段对Hastelloy X(HX)合金的晶界特征分布、拉伸断口形貌及位错分布等进行研究。结果表明,HX合金室温拉伸断口由局部裂纹、微孔和大量的韧窝构成,微孔的形成与材料内部第二相颗粒分布有关。组织为晶内共格孪晶型的材料开裂是裂纹源扩展引起的,而组织为非共格孪晶型的样品是微孔聚集导致的开裂。分析表明,不同晶界特征分布的样品室温力学性能的差异,主要是晶粒尺寸和一次碳化物分布作用的结果。
Effect of grain boundary character distribution(GBCD)on mechanical properties of the Hastelloy X(HX)alloy was investigated.Scanning electron microscopy(SEM),electron backscattered diffraction(EBSD)and transmission electron microscope(TEM)were employed to examine the GBCD,fracture morphology and dislocation distributes.The results show that the tensile fracture at room temperature is composed of local cracks,dimples,and voids related to second phase precipitates.The cracking of the material with intragranular coherent twin structure is caused by the propagation of crack source,while that with incoherent twins is induced by microvoid coalescence.It indicates that the difference of mechanical properties at room temperature of the specimen with different grain boundary character distributions is mainly due to the effect of grain size and primary carbide distribution.
作者
王小艳
韩俊杰
孙道锋
任琪琪
杨淏鑫
张永建
Wang Xiaoyan;Han Junjie;Sun Daofeng;Ren Qiqi;Yang Haoxin;Zhang Yongjian(School of Mechanical and Material Engineering,Xi’an University,Xi’an Shaanxi 710065,China;Shaanxi Key Laboratory of Surface Engineering and Remanufacturing,Xi’an Shaanxi 710065,China;Xi'an Key Laboratory of Intelligent Additive Manufacturing,Xi'an Shaanxi 710065,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第6期205-209,共5页
Heat Treatment of Metals
基金
陕西省科技厅自然科学基础研究计划项目一般项目(青年)(2020JQ-889)
陕西省教育厅专项科研计划(19JK0739)
西安市科技计划创新基金“文理专项”项目(2020KJWL06)
国家自然科学基金青年科学基金(11902250)
关键词
哈氏合金
晶界特征分布
力学性能
Hastelloy alloy
grain boundary character distribution(GBCD)
mechanical properties
