摘要
利用有限元方法分析了IN718合金CT试样裂纹区域的应力应变分布、裂纹尖端应力强度因子及第二相状态对它的影响,计算结果与实测数据基本一致,表明采用有限元方法研究含裂纹体构件的蠕变行为是一种较好的研究手段。通过计算认为,IN718合金在时效初期虽然有α-Cr相的析出而不至于促进蠕变裂纹扩展,是由于α-Cr于δ相周围γ″贫化区(微塑性区)内析出而处于微塑性区内使得裂纹尖端钝化,不利于裂纹扩展。
The stress distribution and precipitation phase around creep crack during the initial stage of creep crack propagation of IN718 alloy were investigated, and the stress intensity factor was calculated at different stress levels by using FEM calculation method The agreement of the calculated data with the tested data shows that the FEM model and the calculation method are suitable for studying the effect of creep crack propagation in superalloys Furthermore, the influence of precipitation phase and the plastic zone around the precipitation phase on stress distribution was studiedCalculation results show that the precipitation of αCr phase within plastic zone does not promote the creep crack propagation
出处
《材料工程》
EI
CAS
CSCD
北大核心
2003年第10期26-28,共3页
Journal of Materials Engineering
基金
国家自然科学基金资助项目 ( 5 0 1710 0 5 )
