首页> 外文会议>Eighth International Fatigue Congress Vol.5, Jun 3-7, 2002, Stockholm, Sweden >FATIGUE BEHAVIOUR OF A NITRIDED 4140 STEEL: COMPETITION BETWEEN TWO MECHANISMS
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FATIGUE BEHAVIOUR OF A NITRIDED 4140 STEEL: COMPETITION BETWEEN TWO MECHANISMS

机译:渗氮4140钢的疲劳行为:两种机理之间的竞争

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摘要

The high-cycle fatigue of a gas nitrided 4140 steel was investigated under axial tension-compression loading. Fatigue life improvement increases with decreasing stress level and increasing nitrided layer thickness until 700μm. Fatigue failure results from the competition between a surface crack that has to initiate and to grow through a compressive residual stress field and a circular crack growing from an internal flaw in a vacuum-like environment. Above a certain diffusion case depth, residual stress field is deep enough for failure to always occur from interior cracking. Subsurface cracking depends no more on nitriding but on material microstructure (e.g. size of inclusions) and on the size of the stressed volume where a crack can initiate.
机译:研究了轴向拉伸压缩载荷下气体氮化4140钢的高周疲劳。疲劳寿命的提高随着应力水平的降低和氮化层厚度的增加而增加,直至700μm。疲劳破坏是由于必须通过压缩残余应力场引发并增长的表面裂纹与由类似真空的环境中的内部缺陷引起的圆形裂纹之间的竞争所致。在一定扩散壳深度以上,残余应力场足够深,以至于内部裂纹始终不会发生。地下裂纹不再取决于氮化,而取决于材料的微观结构(例如夹杂物的大小)以及裂纹可能引发的应力体积的大小。

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