在现场EBSD观测和数值模拟DP780双相钢的微结构演变和应变定位
Yupeng Ren1, Shengci Li1,2, Shaohua Feng1
1School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Materials (Basel, Switzerland)
|January 25, 2025
概括
这项研究揭示了780MPa级铁/马石双相钢在压力下如何变形. 在几何上必要的位移积累,影响谷物边界,导致性骨折.
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:
- 双相钢,如780MPa级铁/马丁类型,在汽车和结构应用中至关重要.
- 了解它们在压力下的微观结构演变对于预测性能和失败至关重要.
- 之前的研究已经探索了它们的机械特性,但对变形机制的详细现场分析仍在进行中.
研究的目的:
- 在单轴拉伸变形过程中研究780MPa级铁/马石双相钢的微观结构演变和应力-张力分布.
- 阐明几何必要失位 (GNDs) 在塑料变形和断裂中的作用.
- 为了将微观结构变化与宏观机械行为相关联.
主要方法:
- 在现场电子反射散射衍射 (EBSD) 观察变形过程中的微观结构变化.
- 晶体塑料有限元素方法 (CPFEM) 模拟应力-变压分布和塑料变形.
- 分析骨折形态,以确定故障机制.
主要成果:
- 费里特中不断积累的几何必要失位 (GNDs),促进了粒度边界的形成.
- 平均误导角度的减少和低角度谷粒边界的增加随着变压的增加.
- 塑料变形集中在柔软的费里特区域,特别是在高张力的加载方向的45°分布范围内.
- 与GND积累相关的界面解锁.
- 骨折表面表现出典型的柔性骨折特征.
结论:
- 该研究阐明了在单轴张力下双相钢的微结构演变和应力分布.
- 在变形机制和界面解中,几何上必要的位移起着至关重要的作用.
- 这些发现有助于更好地了解这些先进的高强度钢的柔性断裂行为.
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