在EBM的缺陷演变上,通过现场调查进行了增材制造的Ti-6Al-4V
Wei Sun1, Ming Li2, Hezong Li3
1School of Intelligent Manufacturing and Electronic Engineering, Wenzhou University of Technology, Wenzhou 325035, China.
Materials (Basel, Switzerland)
|June 27, 2024
概括
增材制造的 (Ti-6Al-4V) 的缺陷显著影响断裂. 球形缺陷在拉力负荷下演变,聚焦应力并启动裂,最终导致材料故障.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 由于固有的缺陷,Ti-6Al-4V的增材制造 (AM) 存在挑战.
- 了解缺陷进化对于预测物质在压力下的行为至关重要.
研究的目的:
- 在单轴拉伸负荷下调查增材制造的Ti-6Al-4V中缺陷的现场演变.
- 为了阐明受这些缺陷影响的断裂机制.
主要方法:
- 微观结构的表征,以识别初始缺陷.
- 在现场拉伸试验以实时观察缺陷行为.
- 缺陷几何演变和应力度效应的分析.
主要成果:
- 球形缺陷变形成圆形状,由拉力负荷驱动.
- 由于应力度,在缺陷附近增加了滑带密度.
- 在断裂过程中,缺陷几何变得不规则,这归因于微空隙的多轴应力状态.
- 缺陷被确定为裂启动的关键位置.
结论:
- 缺陷演变显著影响AM Ti-6Al-4V的断裂机制.
- 围绕缺陷的压力集中是裂启动的主要驱动因素.
- 控制缺陷对于提高AM合金的机械完整性至关重要.
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