摘要
通过对不同形状夹杂物缺陷的单晶镍基合金蠕变性能测试、组织形貌观察及采用有限元对近夹杂物区域的应力场进行分析,研究了不同形状夹杂物缺陷对单晶合金蠕变行为及组织演化的影响。结果表明:夹杂物缺陷可明显降低单晶镍基合金的塑性和蠕变寿命。在高温蠕变期间,近夹杂物区域的应力等值线具有圆弧形分布特征。蠕变期间,在夹杂物的两侧极点处具有最小应力值,而在夹杂物缺陷的上、下区域具有较大的应力值,随蠕变时间延长,应力值增大,促使裂纹在该处长大,并且裂纹将沿平行于应力轴方向扩展是降低合金蠕变寿命的主要原因。
By testing creep performance of single crystal nickel-based superalloy with inclusions of different shape, observing microstructure and analyzing the stress field near the inclusion area using the finite element, the influences of different shape inclusion defects on creep behavior and microstructural evolution of single crystal superalloys were studied. The results show that the inclusions can significantly reduce the plasticity and creep life of the single crystal nickel-based superalloys. During high temperature creep in recent mixed stress contours of the things the region has an arc-shaped distribution characteristic. Creep period, with minimum stress value in the inclusion of both sides of the pole, while inclusions in the alloy, the area under the stress value, with the creep time extension, the stress increases, prompting the crack in the director, and cracks along the parallel to the stress axis expansion is the main reason for reducing the creep life of the superalloy.
出处
《铸造》
CAS
CSCD
北大核心
2012年第10期1181-1185,共5页
Foundry
关键词
单晶镍基合金
夹杂物
蠕变寿命
有限元分析
single crystal nickel-based superalloys
inclusion
creep life
FEM analysis
