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首页> 外文期刊>Materials Science and Engineering >Fatigue crack growth analysis of plasma nitrided AISI 4140 low-alloy steel: Part 1-constant amplitude loading
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Fatigue crack growth analysis of plasma nitrided AISI 4140 low-alloy steel: Part 1-constant amplitude loading

机译：等离子氮化AISI 4140低合金钢的疲劳裂纹扩展分析：第1部分：恒定振幅载荷

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摘要

The compact tension (CT) specimens manufactured from AISI 4140 steel were plasma nitrided at 400 ℃, 500 ℃ and 600 ℃ for 1 and 4 h in a gas mixture of 50% N_2 and 50% H_2. CT specimens were subjected to fatigue crack growth under constant amplitude loading in order to analyze the effect of plasma nitriding on fatigue crack growth (FCG). The crack sizes of specimens were correctly detected by a digital image monitoring system. Also, the structural and mechanical properties of specimens were characterized by XRD, SEM, optical microscopy and 3D profilometer and microhardness tester. The structural and mechanical examinations showed that the surface hardness, layer thicknesses and surface residual stresses continuously increased with increasing plasma nitriding time and temperature. It was found that plasma nitriding improved the FCG life of the material due to the formation of compressive residual stresses and nitride layers in surface and near-surface regions. Additionally, the highest FCG increase rate was obtained from 500 ℃ to 4 h plasma nitrided specimen with respect to untreated specimen. The formation of compound layer and braunite layer constrained the continuous increase of FCG life because of increasing embrittlement and cracking tendency of nitride layers.
机译：在50％N_2和50％H_2的混合气体中，将AISI 4140钢制成的紧密拉伸（CT）试样在400℃，500℃和600℃下进行了等离子渗氮处理1和4 h。为了分析等离子氮化对疲劳裂纹扩展（FCG）的影响，对CT试样在恒定振幅载荷下进行了疲劳裂纹扩展。通过数字图像监控系统可以正确检测出试样的裂纹尺寸。此外，通过XRD，SEM，光学显微镜，3D轮廓仪和显微硬度测试仪对样品的结构和力学性能进行了表征。结构和机械检查表明，随着等离子体氮化时间和温度的增加，表面硬度，层厚度和表面残余应力不断增加。发现由于在表面和近表面区域中形成压缩残余应力和氮化物层，等离子体氮化改善了材料的FCG寿命。另外，相对于未经处理的试样，从500℃到4 h的等离子体氮化试样获得了最高的FCG增长率。由于氮化物层的脆化和开裂趋势的增加，化合物层和褐铁矿层的形成限制了FCG寿命的连续增加。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|257-264|共8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;

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  • 正文语种 eng
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  • 关键词

    Fatigue crack growth; Fatigue; Plasma nitriding; Constant amplitude loading;

    机译：疲劳裂纹扩展;疲劳;等离子体氮化;恒定振幅加载;

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