...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Fatigue crack growth analysis of plasma nitrided AISI 4140 low-alloy steel: Part 2-Variable amplitude loading and load interactions
【24h】

Fatigue crack growth analysis of plasma nitrided AISI 4140 low-alloy steel: Part 2-Variable amplitude loading and load interactions

机译：等离子氮化AISI 4140低合金钢的疲劳裂纹扩展分析：第2部分：可变振幅载荷和载荷相互作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of plasma nitriding on fatigue crack growth (FCG) properties of AISI 4140 low-alloy steel under variable amplitude loading (VAL) conditions were investigated. The compact tension specimens made of AISI 4140 were plasma nitrided at 400 ℃, 500 ℃ and 600 ℃ for 1 and 4 h. CT specimens were subjected to fatigue under different VAL conditions including overload (OL), underload (UL), overload + underload (OL+UL) and underload+overload (UL+OL). The OL investigations revealed that the FCG life of untreated and plasma nitrided samples increased with respect to constant amplitude loading (CAL). Plasma nitrided samples exhibited less FCG life increase than untreated sample because of decreased crack tip plastic zone size and crack retardation period. In the case of UL, FCG lives of all samples decreased in comparison to CAL The effect of tensile residual stresses formed after UL was suppressed by the compressive residual stresses produced by plasma nitriding. Also, it was seen that the increasing compound layer thickness and the presence of Braunite phase increased the brittleness of the material regardless of the loading type. The overall results showed that the loding type and mechanical/structural characteristics of nitride layers significantly affected the FCG behavior of the material.
机译：研究了在变幅载荷（VAL）下等离子渗氮对AISI 4140低合金钢疲劳裂纹扩展（FCG）性能的影响。将AISI 4140制成的致密拉伸试样在400℃，500℃和600℃下进行了1和4 h的等离子渗氮处理。 CT标本在不同的VAL条件下承受疲劳，包括过载（OL），欠载（UL），过载+欠载（OL + UL）和欠载+过载（UL + OL）。 OL研究表明，相对于恒定振幅载荷（CAL），未处理和等离子氮化样品的FCG寿命增加。与等离子氮化样品相比，由于裂纹尖端塑性区尺寸的减小和裂纹延迟期的减少，FCG寿命的增加幅度小于未处理样品。在UL的情况下，与CAL相比，所有样品的FCG寿命均缩短。在UL之后形成的拉伸残余应力的影响被等离子体氮化产生的压缩残余应力所抑制。此外，可以看出，无论负载类型如何，化合物层厚度的增加和布朗尼相的存在都会增加材料的脆性。总体结果表明，氮化物层的滑移类型和机械/结构特征显着影响了材料的FCG行为。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第30期|265-275|共11页
  • 作者

    H. Kovaci; A.F. Yetim; OE. Baran; A. Celik;

  • 作者单位

    Ataturk University, Faculty of Engineering, Department of Mechanical Engineering, Erzurum, Turkey;

    Erzurum Technical University, Faculty of Engineering and Architecture, Department of Mechanical Engineering, Erzurum, Turkey;

    Erzincan University, Faculty of Engineering, Department of Mechanical Engineering, Erzincan, Turkey;

    Ataturk University, Faculty of Engineering, Department of Mechanical Engineering, Erzurum, Turkey;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fatigue crack growth; Plasma nitriding; Variable amplitude loading; Overload; Underload;

    机译：疲劳裂纹扩展;等离子体氮化;可变振幅负载;超载;欠载;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号