The effect of shot peening on fatigue and corrosion behavior of 316L stainless steel in Ringer's solution
The effect of shot peening on fatigue and corrosion behavior of 316L stainless steel in Ringer's solution
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DOI：
10.1016/j.surfcoat.2010.04.015
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发表时间：
2010-08-15
影响因子：
5.4
通讯作者：
Yazdi, Mahboobeh Rezaee
中科院分区：
文献类型：
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作者：
Azar, V.;Hashemi, B.;Yazdi, Mahboobeh Rezaee
不锈钢316L是用于生产骨科植入物的最常见生物材料之一。但它的抗疲劳和耐磨性较低。因此，表面处理，如喷丸处理，用于修改表面性能。本文研究了喷丸处理对316L不锈钢硬度、疲劳性能以及在林格溶液中腐蚀行为的影响。为此，钢试样进行喷丸处理5，10，15，20和25分钟。硬度，疲劳和电化学测试进行喷丸处理前后的每个试样。在平衡时间2小时后，在林格溶液中测量试样的开路电位（OCP）300 s。循环动电位极化测试以5mVis的扫描速率进行。结果表明，喷丸处理提高了表面硬度和抗疲劳性能。此外，这种处理降低了钝化层的击穿电位，并增加了喷丸试样的腐蚀电流密度达10分钟，这表明抗点蚀性能降低。而在腐蚀后期，钝化层的击穿电位开始升高，腐蚀电流密度开始减小。这种趋势继续下去，甚至耐点蚀的条件相比，在更长的喷丸时间未喷丸试样改善。用扫描电子显微镜（SEM）观察了试样的断口形貌。(C)2010 Elsevier BV保留所有权利。
Stainless steel 316L is one of the most common biomaterials utilized for producing orthopedic implants. But it has low resistance to fatigue and wear. Therefore surface treatments such as shot peening are used to modify the surface properties. In the present research, the influence of shot peening treatment on hardness, fatigue and corrosion behavior of 316L stainless steel in Ringer's solution was investigated. For this purpose, the steel specimens were shot peened for 5, 10, 15, 20 and 25 min. Hardness, fatigue and electrochemical tests were performed on each specimen before and after shot peening treatment. The open circuit potential (OCP) of the specimens, after 2 h of equilibrium time, was measured in Ringer's solution for 300 s. The cyclic potentiodynamic polarization tests were performed with 5 mVis scan rate. According to the results, the shot peening treatment increases the surface hardness and fatigue resistance. In addition, this treatment decreases the break-down potential of the passive layer and increases the corrosion current density in shot peened specimens up to 10 min, which shows a reduction in resistance to pitting corrosion. However, the break-down potential of the passive layer begins to increase and the corrosion current density decreases at upper times. This trend continues such that even the conditions of resistance to pitting corrosion improve in comparison with un-shot peened specimens at longer times of shot peening. The morphology of the fractured surfaces of samples was investigated by scanning electron microscopy (SEM). (C) 2010 Elsevier B.V. All rights reserved.