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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue Life Improvements of the AISI 304 Stainless Steel Ground Surfaces by Wire Brushing
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Fatigue Life Improvements of the AISI 304 Stainless Steel Ground Surfaces by Wire Brushing

机译：通过钢丝刷改善AISI 304不锈钢接地表面的疲劳寿命

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The surface and subsurface integrity of metallic ground components is usually characterized by an induced tensile residual stress, which has a detrimental effect on the fatigue life of these components. In particular, it tends to accelerate the initiation and growth of the fatigue cracks. In this investigation, to deliberately generate compressive residual stresses into the ground surfaces of the AISI 304 stainless steel (SS), wire brushing was applied. It was found that under the experimental conditions selected in this investigation, while the surface roughness was slightly improved by the brushing process, the surface residual stress shifted from a tensile stress (sigma_|| = +450 MPa) to a compressive stress (sigma_|| = -435 MPa). On the other hand, the work-hardened deformation layer was almost two times deeper after wire brushing. Concerning the fatigue life, an improvement of 26 percent in terms of endurance limit at 2 x 10~6 cycles was realized. Scanning electron microscope (SEM) observations of the fatigue fracture location and size were carried out to explain the fatigue life improvement. It was found that the enhancement of the fatigue strength could be correlated with the distribution and location of the fatigue fracture nucleation sites. Concerning the ground surfaces, it was seen that the fatigue cracks initiated at the bottom of the grinding grooves and were particularly long (150-200 mum). However, the fatigue cracks at the brushed surfaces were shorter (20-40 mum) and appeared to initiate sideways to the plowed material caused by the wire brushing. The results of the wire-brushed surface characterization have shown that significant advantages can be realized regarding surface integrity by the application of this low-cost process compared to shot peening.
机译：金属地面组件的表面和亚表面完整性通常以感应的残余残余应力为特征，这会对这些组件的疲劳寿命产生不利影响。特别是，它趋向于加速疲劳裂纹的产生和发展。在这项研究中，为了有意向AISI 304不锈钢（SS）的地面产生压缩残余应力，我们应用了钢丝刷。结果发现，在本研究中选择的实验条件下，尽管表面粗糙度通过刷涂工艺有所改善，但表面残余应力从拉伸应力（sigma_ || = +450 MPa）转变为压应力（sigma_ ||）。 | = -435 MPa）。另一方面，在刷丝后，加工硬化的变形层的深度几乎增加了两倍。关于疲劳寿命，在2 x 10〜6次循环时的耐力极限提高了26％。用扫描电子显微镜（SEM）观察疲劳断裂的位置和大小，以解释疲劳寿命的改善。发现疲劳强度的提高可能与疲劳断裂形核部位的分布和位置有关。关于地面，可以看到疲劳裂纹在磨削槽的底部开始，并且特别长（150-200微米）。但是，拉丝表面的疲劳裂纹更短（20-40毫米），并且似乎是由钢丝刷引起的，侧向萌生的材料。钢丝刷表面表征的结果表明，与喷丸处理相比，通过应用这种低成本工艺，可以实现表面完整性方面的显着优势。

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