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首页> 外文会议>International Conference on Shot Peening >Looking for the Optimal Shot Peening Treatment on Quenched and Tempered Steels with Different Hardness Levels
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Looking for the Optimal Shot Peening Treatment on Quenched and Tempered Steels with Different Hardness Levels

机译：寻找在淬火和淬火钢的最佳射击处理，具有不同的硬度水平

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Bars of a medium-carbon alloyed steel (AISI 4340), with a diameter of 16 mm, were subjected to different heat treatments (quenched and tempered between 200°C and 680°C) in order to achieve different mechanical properties. The bars were cut and machined to obtain fatigue specimens that were subjected to different shot peening treatments (diverse Almen intensities under 100% coverage) using cut wire shots of different sizes in a direct compressed air shot peening machine. X-ray diffraction (XRD) combined with electro-polishing techniques were used to obtain the different residual stress profiles induced by shot peening in each steel. Moreover, the specimen roughness was also measured. Finally, fatigue tests were performed in a four-point loading rotating beam testing machine (R=-1) to determinate the fatigue life under a stress slightly higher than the fatigue limit of each steel. It was observed that every heat treated steel had an optimal Almen intensity in order to attain the best fatigue behavior, which is dependent on its mechanical properties. The optimal Almen intensity is larger for mid-strength steels than for weaker and stronger ones, due to the existing compromise between the extension of the induced compressive residual stress field and the surface damage produced by shot impacts.
机译：一个中等碳合金钢（AISI 4340），用直径为16mm的棒，进行不同的热处理（淬火和200℃和680℃之间回火），以实现不同的机械性能。将棒切割和机加工，以获得使用不同尺寸的丝切镜头在直接压缩空气喷丸机（100％覆盖率下多样的Almen强度）受到不同喷丸处理疲劳试样。具有电抛光技术组合的X射线衍射（XRD）用于获得由拍摄在各钢喷丸引起的不同的残余应力分布。此外，试样的粗糙度也被测量。最后，疲劳试验中的四点加载旋转梁试验机（R = -1），以确定的疲劳寿命的应力下略高于各钢的疲劳极限进行。据观察，每热处理钢，以达到最佳的疲劳特性，这是依赖于它的机械性能有一个最佳Almen强度。最佳Almen强度为中等强度钢比较弱和较强的人，由于诱发的压缩残余应力场的延伸和通过镜头的影响所产生的表面损伤之间的现有折衷大。

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