Incoloy 825合金在拉/压应变保时下循环变形行为  

Cyclic deformation behavior of Incoloy 825 alloy under tensile/compression strains and load-holding

作　　者：李锋[1] 霍萧冉 陈立佳[1] LI Feng;HUO Xiao-ran;CHEN Li-jia(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2022年第4期383-388,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51805335).

摘　　要：为了研究Incoloy 825合金的循环变形行为,在650℃拉伸或压缩应变保时条件下进行了循环变形实验,并得出相应的应变疲劳参数.利用透射电子显微镜和扫描电子显微镜观察了合金循环变形后的位错亚结构和断口形貌.结果表明:在循环变形条件下合金拉伸应变保时发生循环硬化、先循环硬化后循环软化或循环稳定行为;合金在压缩应变保时发生循环硬化或先循环硬化后循环稳定行为.合金的变形机制均为平面滑移,合金中的裂纹萌生与扩展模式均为穿晶型.In order to clarify the cyclic deformation behavior of Incoloy 825 alloy,cycling deformation tests under tensile or compression strains and load-holding at 650℃were carried out,and corresponding strain fatigue parameters were determined.Dislocation substructures and fracture surface morphologies of the alloy after cyclic deformation were observed with transmission electron microscope and scanning electron microscope.The results show that the alloy subjected to cyclic deformation exhibits the cyclic hardening or the cyclic hardening followed by either cyclic softening or cyclic stability under tensile strain and load-holding,whereas it exhibits the cyclic hardening or the cyclic hardening followed by cyclic stability under compression strain and load-holding.The deformation mechanism of alloy is planar slip.In addition,the cracks in the alloy initiate and propagate in trans-granular mode.

关 键 词：Incoloy 825合金 循环变形行为 拉伸应变 压缩应变 疲劳寿命 循环应力响应 位错亚结构 穿晶断裂 

分 类 号：TG146[一般工业技术—材料科学与工程]