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预先微结构对诱导硬化JIS SCM440钢的性能的影响
Shao-Quan Lu1, Liu-Ho Chiu1, Hsueh-Hung Cheng1
1Department of Mechanical and Materials Engineering, Tatung University, Taipei 104-327, Taiwan.
Materials (Basel, Switzerland)
|March 13, 2025
概括
之前的微观结构显著影响了JIS SCM440钢在感应硬化后的性能. 一个和化的先前微结构产生了最深的硬化和最广泛的压缩余应力,这对于疲劳性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 表面工程是什么?表面工程是什么?
背景情况:
- JIS SCM440钢对于需要感应硬化的精密零件至关重要.
- 疲劳行为受到硬化深度,硬度和残留压力的影响.
- 了解先前的微结构的影响是优化诱导硬化的关键.
研究的目的:
- 为了研究不同的先前微结构 (球状化,化,正常化,化和化) 在诱导硬化后如何影响JIS SCM440钢.
- 分析对微硬度,硬化宽度和残余应力分布的影响.
- 为了将微观结构变化与机械性质结果相关联.
主要方法:
- 诱导硬化JIS SCM440钢样品的各种先前微观结构.
- 微硬度测试用于确定硬度配置文件.
- 用X射线衍射或类似的技术来测量残余应力.
- 微观结构分析,观察相变化和水泥石溶解.
主要成果:
- 余应力分布由感应硬化温度梯度来支配,其中核心的压力应力 (马氏体变化) 和受热影响区域的拉力应力 (不完全变化).
- 先前的微观结构影响了水泥石溶解和奥氏体碳含量,影响了微硬度和残余应力.
- 标准化的先前微观结构导致受热影响区域的最高拉伸余应力 (371 MPa).
- 和化的先前微结构导致了最深的硬化,最大的压力残余应力范围,最高的微硬度 (764 HV0.3) 和最大的压力残余应力 (-752 MPa).
结论:
- 预先的微观结构是定制JIS SCM440钢对感应硬化反应的关键因素.
- 优化先前的微观结构,特别是灭和炼,增强了硬化深度和压缩残余应力,以改善疲劳寿命.
- 这项研究为选择合适的预处理方法提供了基础,以实现感应硬化SCM440钢元件所需的机械性能.
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