镍基单晶合金筏化规律及蠕变持久寿命模型在复杂应力状态下的考核  

On the Validation of Rafting Law and Creep Life of Nickel -base Single Crystal Superalloys under Multiaxial Stress States

作　　者：岳珠峰[1] 胡卫兵[2] 吕震宙[1] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西安建筑科技大学,陕西西安710055

出　　处：《稀有金属材料与工程》2002年第6期419-422,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50005016);航空科学基金(00B53010);航天科学基金;长江学者基金资助项目

摘　　要：利用双剪切蠕变试样在受剪切区的筏化试验结果和不同晶体取向试样的蠕变持久寿命试验结果,对镍基单晶合金的蠕变筏化预测模型和蠕变持久寿命模型进行考核,证实此2个模型的合理性。The double shear creep specimens have been applied to validate the raftin g prediction criterion and creep life models.The double shear creep specimens have experime nted at 950℃for different assumed activate slip systems (crystallographic shear planes).The SEM photos of the rafting structures in d ifferent positions in the shear zone have been obtained and were applied t o validate the rafting criterion.The creep lives for the double shear creep specimens have been obtained by using the crystallographic damage fini te element method(FEM).Together with the experimental resu lts and the FEM results,the life model results agree with the experimenta l results and the FEM results.The confirmation results are satisfactory.

关 键 词：镍基单晶合金 蠕变筏化 蠕变持久寿命模型 双剪切试样 复杂应力状态 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG1[金属学及工艺—金属材料]