摘要
采用CPFEM方法对单晶镍基高温合金DD6在760℃下的横向拉伸力学性能进行了研究,分别在不同晶体取向和加载应变速率条件下对合金的力学性能和晶体变形特征进行了分析。结果表明,计算得到的本构参数可很好的表达其力学性能,在横向拉伸下,弹性模量随晶体偏转角度增加而增加。由于不同取向下滑移系激活情况不同,合金在[100]和[110]取向具有较高的屈服应力,而在[120]取向合金则表现出较低的屈服应力。同一晶体取向不同应变速率条件下,屈服应力与应变速率的自然对数呈线性关系。
Crystal plasticity finite element method(CPFEM) was adopted to investigate the transverse tensile mechanical properties of single crystal nickel-based superalloy DD6 at 760 ℃. The influence of crystal orientation and loading strain rate on the mechanical properties and deformation characteristics of DD6 alloy were analyzed as well. The results indicate that the calculated constitutive parameters can express the mechanical performance of DD6 well and elastic modulus is increased with the increase of crystal deflection angle under transverse tensile condition. A higher yield stress in the [100] and [110] orientation and a lower yield stress and better ductility in [120] orientation can be obtained due to the various activation of crystal slip system for different orientations. For the same crystal orientation, yield stress and the natural logarithm of strain rate shows a linear relationship under different strain rates.
作者
孔令宇
武建国
武雷刚
刘二强
申强
林金保
Kong Lingyu;Wu Jianguo;Wu Leigang;Liu Erqiang;Shen Qiang;Lin Jinbao(College of Applied Science,Taiyuan University of Science and Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2021年第9期1097-1102,共6页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(11702182)。
关键词
CPFEM
镍基单晶合金
横向拉伸
滑移系
应变速率
CPFEM
Nickel-based Single Crystal Alloy
Transverse Tensile
Slip System
Strain Rate
