在造过程中,40CrNi2MoV钢的动态再结晶和微观结构演变
Wei Zhu1,2, Xiaohe Wang3, Luoxing Li1
1College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, Hunan, China.
iScience
|June 23, 2025
概括
这项研究模拟了用于反应器压力容器 (RPV) 的40CrNi2MoV钢 studs中的微结构演变. 优化的参数实现了统一的谷物精炼,提高了RPV杆的可靠性.
科学领域:
- 材料科学 材料科学 材料科学
- 金工程 金工程 金工程
- 机械工程 机械工程
背景情况:
- 反应堆压力容器 (RPV) 的需要统一的微观结构来实现操作可靠性.
- 特定的钢合金40CrNi2MoV对于RPV螺杆完整性至关重要.
研究的目的:
- 建立40CrNi2MoV钢在加工过程中的微结构演变的预测模型.
- 确定最佳的处理参数,以在RPV研究中实现统一和精细的微观结构.
主要方法:
- 开发一个应变补偿的阿雷尼乌斯构成模型和一个动态再结晶 (DRX) 模型.
- 同热压缩实验在各种温度 (900°C-1180°C) 和应变率 (0.001-0.5s-1) 的范围内进行.
- 用于微观结构演变预测的有限元分析 (FEA),通过处理地图和电子反射散射衍射 (EBSD) 验证.
主要成果:
- 不连续的DRX在900°C/0.5s-1时占主导地位,形成项链结构.
- 连续DRX在更高的温度或较低的应变率下得到了青.
- 在最佳条件下 (1060°C/0.05s−1) 实现了99.28%的DRX体积分数与25.2μm颗粒.
- 在优化的参数下 (1180°C,15 mm/s压缩速度) 模拟预测了均的谷物精炼 (144 μm至17 μm).
结论:
- 开发的模型准确地预测了40CrNi2MoV钢的微结构演变.
- 建立了一个用于预测控制RPV杆微结构的框架.
- 优化处理显著提炼和同质化RPV杆微结构,提高可靠性.
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