沈阳工业大学学报2017，Vol.39Issue(4)：371-377,7.DOI:10.7688/j.issn.1000-1646.2017.04.03
Incoloy 825镍基合金的低周疲劳行为
Low-cycle fatigue behavior of Incoloy 825 nickel-based alloy
摘要
Abstract
In order to investigate the cyclic stress response behavior and low-cycle fatigue behavior of Incoloy 825 nickel-based alloy, the applied total strain amplitude controlled fatigue tests at both room temperature and 760℃ were carried out, and the strain fatigue parameters of the alloy at different temperatures were determined.The dislocation substructures and morphologies of fracture surfaces for the alloy after low-cycle fatigue deformation were analyzed with the transmission electron microscope (TEM) and scanning electron microscope (SEM).The results show that at room temperature, the alloy exhibits the characteristics of cyclic hardening followed by the cyclic softening, while the alloy exhibits the characteristics of cyclic hardening followed by either cyclic softening or cyclic stability at 760℃.The relationship between both plastic and elastic strain amplitudes as well as reversals to failure at different temperatures for the alloy shows a single slope linear behavior, which can be described by the Coffin-Manson and Basquin equations, respectively.At both room temperature and 760℃, the low-cycle fatigue deformation mechanism for the alloy is mainly the planar slip.In addition, the fatigue cracks initiate and propagate in the transgranular mode.关键词
Incoloy 825镍基合金/低周疲劳/循环应力响应/疲劳寿命/位错亚结构/平面滑移/疲劳裂纹/穿晶断裂Key words
Incoloy 825 nickel-based alloy/low-cycle fatigue/cyclic stress response/fatigue life/dislocation substructure/planar slip/fatigue crack/transgranular fracture分类
矿业与冶金引用本文复制引用
陈立佳,王靓亮,王宝森..Incoloy 825镍基合金的低周疲劳行为[J].沈阳工业大学学报,2017,39(4):371-377,7.基金项目
国家自然科学基金资助项目(51134010). （51134010）
