金丹,李宏全,王龙祥

• 1:沈阳化工大学机械与动力工程学院

摘要(Abstract)：

本文针对Haynes230镍基合金进行了700℃温度时，160, 180, 200, 220和240 MPa应力水平下的蠕变实验和扫描电镜（SEM）表征。结果表明，蠕变断裂时间随着应力水平增加逐渐减少。依据蠕变应变速率，各应力水平下蠕变过程均表现出了明显的3个阶段，即初始蠕变阶段、稳态蠕变阶段和加速蠕变阶段。稳态阶段变形产生的加工硬化和回复、再结晶同时进行，Haynes230镍基合金未进一步硬化，变形速率基本保持恒定，5个应力水平下的稳态蠕变应变速率分别为1.42×10~(-3), 3.23×10~(-3), 7.27×10~(-3), 1.41×10~(-2)和3.02×10~(-2) h~(-1)。SEM结果表明，各应力水平下断裂机制为沿晶和穿晶断裂混合机制。采用Abaqus软件自带的时间硬化模型进行不同应力水平下的蠕变过程模拟，该模型无法描述蠕变过程中的加速蠕变阶段。基于连续损伤力学的Wilshire-Cao-Sinh(WCS)模型定义本构关系，采用Fortran语言进行二次开发后重新进行模拟计算，5个应力水平下稳态阶段蠕变应变最大平均误差为3.3%，蠕变断裂时间最大误差仅为2.7%。

关键词(KeyWords)： Haynes230镍基合金;蠕变应变速率;有限元模拟;Wilshire-Cao-Sinh(WCS)模型;二次开发

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金项目（11102119）;; 辽宁省教育厅项目（LJKZ0437）资助

作者(Author): 金丹,李宏全,王龙祥

DOI: 10.13373/j.cnki.cjrm.XY25070011

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