摘要
测算了CMSX-2合金持久拉伸断裂时枝晶典型区域的两相密度及γ’相含量。结果表明,枝晶区域两相密度按枝晶干-枝晶臂-枝晶间的顺序依次递减,γ’相含量依次递增;随持久试验温度的升高(伴外应力下降),枝晶区域中γ和γ’相密度连续下降;与中温-高应力持久试验相比,高温-低应力持久试验所得γ’相含量分布的梯度较大。γ’相总量在枝晶区域的分配量表明,枝晶于中γ’相实际含量最低者的持久寿命最短,反之持久寿命最长。
The density of γ and γ' phases and the distribution of γ' amount in the typical dendritic regions of creep- ruptured CM-SX-2 were calculated. The result shows that the density of the two phases decreased and the Y phase amount increased in the dendritic core, arm and interdendrite regions in sequence. The density of J and Y phases decreased successively in the three typical dendritic regions with the increase of the test temperature (accompanied by the decrease of the externally applied stress) . At higher levels of temperature and relatively lower levels of external stress, the gradient of the distribution of Y amount in the three dendritic regions became steeper as compared to case of medium high levels of temperature and relatively higher levels of external stress. The γ' phase amount partitioned in separate dendritic regions was correlated with the creep rupture life of the alloy samples in the two extreme situations. It shows that the lowest amount of the Y phase partitioned into the dendritic core region corresponded to the shortest rupture life of the alloy sample, and the opposite was true when the sample possessed the highest amount of Y phase partitioned to the dendritic core region.
出处
《航空材料学报》
EI
CAS
CSCD
2003年第z1期8-13,共6页
Journal of Aeronautical Materials
基金
国家自然科学基金(50071042)
教育部高等院校骨干教师资助计划项目(2118)
关键词
镍基单晶高温合金
持久拉伸
相密度
相含量
Ni-base single crystal superalloy
creep-rupture tension
phase density
phase content
