New results about the sliding wear resistance under dry and wet conditions of cobalt boride layer exposed to a diffusion annealing process (DAP) were estimated in this study. Firstly, the cobalt boride layer (CoB-Co₂B) was developed at the surface of the ASTM F1537 alloy using the powder-pack boriding process (PPBP) at 1273 K with 6 h of exposure. Then, the borided ASTM F1537 alloy was exposed to the DAP at 1273 K with 2 h of exposure in an argon atmosphere. The cobalt boride layers, obtained by the PPBP and PPBP + DAP, were characterized by different physicochemical techniques and depth-sensing Vickers microindentation to determine the nature of phases formed on the surface, the chemical composition along the depth of the cobalt boride layers, and the indentation properties, respectively. The wear sliding tests on the PPBP, PPBP + DAP, and the reference material (ASTM F1537 alloy) were performed using a ball-on-flat configuration comprised with an WC–Co ball as a counterpart using a constant normal force; particularly, for the wet (lubricated) sliding tests, the materials were immersed in a Hanks’ balanced salt solution. The failure mechanisms on the worn tracks were analyzed and correlated with the behavior of the friction coefficient (CoF) and wear resistance of the tested materials. Finally, and according to the entire set of experimental conditions, the results showed that after DAP, the CoB layer was dissolved completely on the surface of the borided ASTM F1537 alloy, with a change of the magnitude of residual stresses (compressive) on the cobalt boride layer. In addition, under dry and wet conditions, the presence of a stiff and hard (CoB) layer formed by the PPBP on the surface of the ASTM F1537 alloy increased the wear resistance compared with the values estimated on the PPBP + DAP and reference material.

在这项研究中，评估了暴露于扩散退火工艺（DAP）的硼化钴层在干湿条件下的抗滑动磨损性的新结果。首先，硼化钴层（CoB-Co ₂B）使用粉末包装硼化工艺（PPBP）在1273 K暴露6小时的条件下在ASTM F1537合金表面显影。然后，将硼化的ASTM F1537合金在1273 K下暴露于DAP，并在氩气气氛中暴露2 h。由PPBP和PPBP + DAP获得的硼化钴层通过不同的物理化学技术和深度感应维氏显微压痕进行表征，以确定表面上形成的相的性质，沿钴化硼层深度的化学成分以及缩进属性。在PPBP，PPBP + DAP和参考材料（ASTM F1537合金）上的磨损滑动测试是通过使用恒定的法向力，由WC-Co球作为配对物的平面球进行的；特别是对于湿式（润滑）滑动测试，将材料浸入Hanks的平衡盐溶液中。分析了磨损轨道上的失效机理，并将其与被测材料的摩擦系数（CoF）和耐磨性相关。最后，根据整套实验条件，结果表明，在DAP之后，CoB层完全溶解在硼化ASTM F1537合金的表面上，钴上的残余应力（压缩）大小发生了变化。硼化物层。另外，在干燥和湿润的条件下，与在PPBP + DAP和参考材料上估算的值相比，ASTM F1537合金表面上由PPBP形成的坚硬（CoB）层的存在增加了耐磨性。分析了磨损轨道上的失效机理，并将其与被测材料的摩擦系数（CoF）和耐磨性相关。最后，根据整套实验条件，结果表明，经DAP处理后，CoB层完全溶解在硼化ASTM F1537合金的表面上，钴上的残余应力（压缩）幅度发生了变化。硼化物层。另外，在干燥和湿润的条件下，与在PPBP + DAP和参考材料上估算的值相比，ASTM F1537合金表面上由PPBP形成的坚硬（CoB）层的存在增加了耐磨性。分析了磨损轨道上的失效机理，并将其与被测材料的摩擦系数（CoF）和耐磨性相关。最后，根据整套实验条件，结果表明，经DAP处理后，CoB层完全溶解在硼化ASTM F1537合金的表面上，钴上的残余应力（压缩）幅度发生了变化。硼化物层。另外，在干燥和湿润的条件下，与在PPBP + DAP和参考材料上估算的值相比，ASTM F1537合金表面上由PPBP形成的坚硬（CoB）层的存在增加了耐磨性。根据整套实验条件，结果表明，DAP后，CoB层完全溶解在硼化ASTM F1537合金的表面上，而硼化钴层上的残余应力（压缩）幅值发生了变化。另外，在干燥和湿润的条件下，与在PPBP + DAP和参考材料上估算的值相比，ASTM F1537合金表面上由PPBP形成的坚硬（CoB）层的存在增加了耐磨性。根据整套实验条件，结果表明，DAP处理后，CoB层完全溶解在ASTM F1537硼化合金表面上，而硼化钴层上的残余应力（压缩）幅值发生了变化。另外，在干燥和湿润的条件下，与在PPBP + DAP和参考材料上估算的值相比，ASTM F1537合金表面上由PPBP形成的坚硬（CoB）层的存在增加了耐磨性。