划痕对增材制造的Inconel 718拉力性能的影响
Joseph Johnson1, Daniel Kujawski1
1Mechanical and Aerospace Engineering, Western Michigan University, Kalamazoo, MI 49008, USA.
Materials (Basel, Switzerland)
|October 28, 2023
概括
使用激光粉床融合增材制造的Inconel 718表现出隙强化,隙样本显示出比光滑样本更高的抗拉强度. 这表明,由于三轴应力效应在尖附近,材料的口加强.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 增材制造 增材制造 增材制造
背景情况:
- 英康尼尔718是一种高性能合金,广泛用于苛刻的应用.
- 增材制造 (AM),特别是激光粉床融合 (L-PBF),在创建复杂几何形状方面具有优势.
- 了解AM材料的机械行为,包括隙灵敏度,对于可靠的设计至关重要.
研究的目的:
- 为了描述由L-PBF制造的增材制造的Inconel 718的切口灵敏度.
- 为了评估不同口几何形状的影响,并建立对拉伸性能的定向.
- 将实验应变测量与有限元素分析 (FEA) 预测进行比较.
主要方法:
- 在L-PBF Inconel 718的V-notched和光滑拉伸试验样本中,垂直和水平的方向被制造出来.
- 进行了拉伸测试,测量了总轴应变和局部口直径应变.
- 进行有限元分析 (FEA) 来验证应变测量.
- 在骨折表面上进行了断层分析.
主要成果:
- 与光滑标本相比,有的标本具有更高的抗拉强度,导致敏感度比 (NSR) 大于1.
- 该材料显示了口的加强,这是由于三轴应力增加和口尖上的材料约束.
- 在所有标本中观察到柔性失效模式,在较小的口根半径中观察到柔性降低.
结论:
- L-PBF Inconel 718是一种在拉伸负荷条件下口增强材料.
- 该研究提供了AM Inconel 718中隙效应的初步数据,突出了隙几何学和构造方向的影响.
- 建议进行进一步的研究,以调查疲劳和压力破裂负载下的隙效应.
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