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首页> 外文期刊>Materials Science and Engineering >Creep damage mechanism and γ'-phase morphology of a V-notched round bar in Ni-based single crystal superalloys
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Creep damage mechanism and γ'-phase morphology of a V-notched round bar in Ni-based single crystal superalloys

机译：镍基单晶高温合金中V形缺口圆棒的蠕变损伤机理和γ'相形貌

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摘要

The circumferential V-type notched specimen has been designed to investigate the effect of multiaxial stress state on creep rupture behavior of Ni-based single crystal superalloys at 980 ℃. The stress on the minimum net-section is chosen to be 400 MPa. Tests on smooth specimens were also carried out under 400 MPa for comparison. Time to creep fracture was found to be higher in the notched specimens. Scanning Electrical Microscope (SEM) analysis indicated that rupture initiates at the notch root in the notched specimen and at the inner in the smooth specimen. Finite element analysis was carried out to understand the stress distribution and the creep damage evolution under multiaxial stress state. The morphology the evolution of γ'-phase proved that directional coarsening was strongly dependent on the local principal stress field. These findings can be helpful to understand the effect of notch on the creep rupture behavior and mechanism, especially on the γ'-phase morphology evolution.
机译：设计了圆周V型缺口试样，以研究多轴应力状态对980℃下Ni基单晶高温合金的蠕变断裂行为的影响。最小净截面上的应力选择为400 MPa。为了比较，还在400 MPa的压力下对光滑样品进行了测试。缺口试样的蠕变断裂时间较长。扫描电镜（SEM）分析表明，断裂始于缺口试样的缺口根部和光滑试样的内部。进行了有限元分析，以了解多轴应力状态下的应力分布和蠕变损伤演化。 γ′相的形貌演变表明，定向粗化强烈依赖于局部主应力场。这些发现有助于理解缺口对蠕变断裂行为和机理，特别是对γ'相形态演变的影响。

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