Experimental and numerical study on multiaxial creep behavior of 16MND5 steel at 700℃
Experimental and numerical study on multiaxial creep behavior of 16MND5 steel at 700℃
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DOI：
10.1016/j.jnucmat.2021.153387
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发表时间：
2021-11
影响因子：
3.1
通讯作者：
Jianwei Zhu;Dasheng Wang;Shiyi Bao;Qiang Zhou;Z. Qin;Fengping Zhong;Jianfeng Mao
中科院分区：
文献类型：
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作者：
Jianwei Zhu;Dasheng Wang;Shiyi Bao;Qiang Zhou;Z. Qin;Fengping Zhong;Jianfeng Mao
血管内保留(IVR)是一种在严重事故下确保RPV结构完整性的有效策略。在IVR条件下，由于压力容器的几何不连续性，多轴蠕变是RPV失效的主要形式。此外，16MND5钢还经历了从贝氏体到奥氏体相的转变。为了研究多轴蠕变破坏机理，对不同缺口棒进行了700℃的蠕变试验。通过显微组织观察，研究了晶界析出对蠕变行为的影响。在Kachanov-Robotnov连续损伤模型(CDM)的基础上，采用激活能Q项作为修正参数，研究了16NND5钢的损伤演化和多轴蠕变行为。最后，理论预测与实验结果吻合较好。
In-vessel retention (IVR) is an effective strategy of ensuring the structural integrity of RPV under severe accidents. In the IVR condition, due to the geometric discontinuity of pressure vessel, multiaxial creep is the main form of failure of RPV. Moreover, 16MND5 steel undergoes a phase transition from bainite to austenite. In order to study the multiaxial creep failure mechanism, creep tests on different notched bar are carried out at 700℃. The influence of grain boundary precipitation on creep behaviors was studied by micro-structural observation. Furthermore, based on the Kachanov-Robotnov continuous damage model (CDM), the term of activation energy Q is adopted in the newly-developed model as the correction parameter that is used to study the damage evolution and multiaxial creep behaviors of 16NND5 steel. Finally, the good agreement is achieved between theoretical prediction and experimental results.