使用X射线衍射在摩擦动接不同合金中的残余应力测量
1Mechanical Engineering, School of Engineering, Wentworth Institute of Technology, Boston, MA 02115, USA.
Materials (Basel, Switzerland)
|April 13, 2024
概括
不同类型的合金的摩擦接接会产生拉力余应力,特别是在块. 应力水平受到工具旋转和横向速度的影响,显示出不对称的模式.
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:
- 表面残余应力对接关节的性能产生重大影响,例如耐疲劳性和断裂性.
- 连接不相似的合金为先进的应用提供了协同性能组合.
- 摩擦接 (FSW) 是对合金的有效固态连接技术.
研究的目的:
- 为了评估不同合金 (Ti-6242 SG和Ti-54M) 的宏观表面残余应力,通过摩擦接连接.
- 研究工具旋转和横向速度对残余应力分布的影响.
- 了解谷物精炼和区扭曲对残余应力的影响.
主要方法:
- 摩擦接Ti-6242 SG和Ti-54M不同合金的摩擦接.
- 用X射线衍射 (XRD) 来测量残余应力,假设线性格子扭曲.
- 使用LEPTOS® (v7.8) 软件应用sin2φ方法.
- 在1x1mm2的截面内量化表面和1.5mm深度的应力.
主要成果:
- 在接边界和区内观察到拉伸余应力.
- 在特定的低速条件下,在接颗粒中心测量了大约50 MPa的拉伸应力.
- 其余应力值呈现不对称性,并受到不同工具旋转和横向速度的影响.
结论:
- 不同合金的FSW会导致对工艺参数敏感的拉力余应力.
- 残余应力的分布是复杂的,受材料接口和接条件的影响.
- 了解这些应力对于预测不同合金接头的性能至关重要.
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