摘要
通过1.25Cr0.5Mo钢高温环境应力控制的疲劳-蠕变交互作用试验,揭示和分析了1.25Cr0.5Mo钢高温疲劳-蠕变交互作用下应力循环特性以及平均应变、非弹性应变范围等参数随温度、加载历史、加载水平的变化规律,在此基础上,利用扫描电镜对试样断口进行了分析。研究表明:高温环境下,材料的应力循环特性依赖于加载水平和加载历史,平均应变、非弹性应变范围等参数依赖于温度、加载水平和加载历史,材料的断裂从以解理断裂为代表的脆性断裂过渡到以韧窝型剪切断裂为代表的延性断裂,为混合型断裂。
By fatigue-creep interaction tests of 1.25Cr0.5Mo steel at high temperature under stress control,the effects of temperature,load histories and load levels on the stress cycle characteristic,mean strain and inelastic strain range were revealed and discussed.On this basis,the specimen fracture was analyzed by scanning electron microscopy.The results show that the stress cycle characteristic of the material is determined by load levels and load histories at high temperature,and the mean strain and inelastic strain range depend on temperature,load levels and load histories.And the material fracture is the mixing fracture which changes from the brittle fracture with the cleavage fracture characteristic to the ductile fracture with the dimple-type shear fracture characteristic.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2014年第5期643-648,共6页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(51375516)
重庆市科技攻关资助项目(CSTC2013AB3234)
