基于微结构的模拟外挤和增材制造的316L不钢的变形和损伤行为
Huai Wang1, Ho-Won Lee2, Minh Tien Tran2
1School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China.
Materials (Basel, Switzerland)
|May 25, 2024
概括
增材制造的316L不钢 (AMed SS316L) 由于其微观结构,与挤压的SS316L相比,具有更高的度强度,但延伸度较小. 晶体可塑性建模解释了这些微机械变形差异.
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:
- 增材制造 (AM) 为316L不钢等合金提供了新的材料加工途径.
- 了解AMed材料的微机械变形和损伤行为对于其工程应用至关重要.
- 挤出316L不钢作为比较的基准.
研究的目的:
- 研究和比较增材制造 (AMed) 和商业挤压316L不钢的微机械变形和损伤行为.
- 阐明影响这两种材料条件的机械性能的微观结构因素.
- 开发和验证一个晶体可塑性模型来预测这些合金的行为.
主要方法:
- 使用光学显微镜和电子反射散射衍射的实验性表征.
- 单轴拉伸试验用于评估机械性能.
- 基于微观结构的晶体可塑性模型的开发,采用柔性断裂标准.
主要成果:
- 与挤出SS316L相比,AMed SS316L表现出更高的收益强度和较低的延伸.
- 晶体可塑性模型准确地预测了压力-应变行为和纹理演变.
- 在AMed SS316L中,更高的脱位密度和亚粒结构有助于增强强度和降低性.
- 挤出SS316L中的制双胞胎和纹理增强了延长和硬化速度.
结论:
- 微观结构,包括谷物形态和缺陷状态 (移位,双胞胎),显著影响应变局部化和损伤积累.
- 该研究提供了关于AMed与挤出316L不钢的独特变形机制的见解.
- 晶体可塑性建模是理解和预测复杂微观结构的机械反应的强大工具.
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