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动态机械性能和修改的约翰逊-库克模型,考虑到对基粉末金超级合金的再结晶软化
Chen Ling1,2, Xiaoping Ren1,2, Xuepeng Wang1,2
1School of Mechanical Engineering, Shandong University, Jinan 250061, China.
Materials (Basel, Switzerland)
|April 9, 2024
概括
一个经过修改的约翰逊-库克 (J-C) 模型准确地预测了在高温,高应变率加工过程中基超合金的动态机械性能,考虑到动态再结晶. 这增强了对切割机制和模拟的理解.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 金工业是金工业的一个方面.
背景情况:
- 在加工过程中,高温,高延展率的变形可以诱导超级合金中的动态再结晶.
- 这种再结晶改变了材料的动态机械性能,使加工过程分析复杂化.
- 现有的模型可能无法完全捕捉基粉末金超级合金中的这些复杂行为.
研究的目的:
- 为基粉末金超合金提出一个修改后的约翰逊-库克 (J-C) 模型.
- 将动态再结晶在高张率和高温条件下的效应纳入其中.
- 在加工过程中准确预测材料的动态机械性能.
主要方法:
- 通过准静态压缩和分裂的霍普金森压力杆 (SHPB) 测试来实验性地确定动态机械性能.
- 开发一个修改后的J-C模型,考虑动态再结晶.
- 使用线性回归分析对模型系数进行校准.
主要成果:
- 修改后的J-C模型准确地描述了基粉末金超级合金在高拉伸率和高温度下的机械行为.
- 模型预测与实验数据有很好的一致性.
- 该模型有效地捕捉了动态再结晶对材料性能的影响.
结论:
- 建议修改的J-C模型为分析基于的超级合金加工提供了可靠的工具.
- 这项研究有助于理解切割机制和执行有限元模拟.
- 准确的材料性能预测对于优化先进超级合金的加工过程至关重要.
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