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首页> 外文期刊>Surface & Coatings Technology >Evaluation of WC-17Co and WC-10Co-4Cr thermal spray coatings by HVOF on the fatigue and corrosion strength of AISI 4340 steel
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Evaluation of WC-17Co and WC-10Co-4Cr thermal spray coatings by HVOF on the fatigue and corrosion strength of AISI 4340 steel

机译:HVOF对WC-17Co和WC-10Co-4Cr热喷涂层对AISI 4340钢的疲劳强度和腐蚀强度的评估

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摘要

It is known that chromium electroplating is related to the reduction in the fatigue strength of base metal. However, chromium results in protection against wear and corrosion combined with chemical resistance and good lubricity. Environmental requirements are an important point to be considered in the search for possible alternatives to hard chrome plating. Aircraft landing gear manufactures are considering WC thermal spray coating applied by the high-velocity oxygen-fuel (HVOF) process an alternative candidate, which shows performance at least comparable to results, obtained for hard chrome plating. The aim of this study is to compare the influence of WC-17Co and WC-10Co-4Cr coatings applied by HVOF process and hard chromium electroplating on the fatigue strength of AISI 4340 steel, with and without shot peening. S-N curves were obtained in axial fatigue test for base material, chromium plated and tungsten carbide coated specimens. Tungsten carbide thermal spray coating results in higher fatigue strength when compared to hard chromium electroplated. Shot peening prior to thermal spraying showed to be an excellent alternative to increase fatigue strength of AISI 4340 steel. Experimental data showed higher axial fatigue and corrosion resistance in salt fog exposure for samples WC-10Co-4Cr HVOF coated when compared with WC-17Co. Fracture surface analysis by scanning electron microscopy (SEM) indicated the existence of a uniform coverage of nearly all substrates. (C) 2004 Elsevier B.V. All rights reserved.
机译:已知铬电镀与贱金属的疲劳强度的降低有关。但是,铬可以防止磨损和腐蚀,并具有耐化学性和良好的润滑性。在寻找可能的硬铬镀层替代品时,环境要求是要考虑的重要点。飞机起落架制造商正在考虑通过高速氧气-燃料(HVOF)工艺施加的WC热喷涂涂层作为替代选择,该涂层显示出的性能至少可与硬镀铬获得的结果相媲美。这项研究的目的是比较采用HVOF工艺和硬铬电镀的WC-17Co和WC-10Co-4Cr涂层对AISI 4340钢在有无喷丸处理时的疲劳强度的影响。在轴向疲劳试验中,对基材,镀铬和碳化钨涂层的样品获得了S-N曲线。与电镀硬铬相比,碳化钨热喷涂涂层具有更高的疲劳强度。热喷涂之前的喷丸处理显示出是提高AISI 4340钢疲劳强度的绝佳选择。实验数据表明,与WC-17Co相比,WC-10Co-4Cr HVOF涂层样品在盐雾暴露中具有更高的轴向疲劳性能和耐腐蚀性。通过扫描电子显微镜(SEM)进行的断裂表面分析表明几乎所有基底均存在均匀覆盖。 (C)2004 Elsevier B.V.保留所有权利。

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