Abstract

The current work investigates the reciprocating wear behavior of surface mechanical attrition–treated (SMAT) AISI 316L stainless steel with and without polymer and composite coatings. The high-performance aromatic thermoset polymer (ATSP) and its composite with MoS₂ are deposited on non-SMATed and SMATed steel using the spin coating technique. Further, a reciprocating wear test is performed on non-SMATed, SMATed, and coated surfaces against an alumina ball using different loads and reciprocation cycles. Enhanced surface hardness (∼89%), presence of an α′ (body-centered cubic [bcc] Fe) phase, and lower oxidation during reciprocation cause a decrease in wear loss and coefficient of friction (COF) of the SMATed surface by ∼37, and ∼20%, respectively, under 15 N load and most extended reciprocation cycle. The wear loss and COF of the steel are further reduced by depositing ATSP polymer and ATSP-MoS₂ composite coatings. The adhesion and durability of coatings are enhanced by the SMAT process. This enhanced durability lowers the wear loss and COF of ATSP and ATSP-MoS₂ composite coatings when deposited on the SMATed substrate. Polymer coating reduces the COF of non-SMATed and SMATed steel by ∼68 and ∼85%, respectively. Depending on the concentration of MoS₂ in the composite coating, the COF ranges from 0.04 to 0.32 and from 0.02 to 0.07 for non-SMATed and SMATed specimens, respectively. The best performance of a composite coating was observed at ∼10 wt% MoS₂. The COF of composite coated steel is ∼96% lower than that of the noncoated and nontreated steel surface. The SMAT processing of substrate and ATSP-MoS₂ composite coating considerably enhances the tribological performance of AISI 316L steel.

摘要

目前的工作研究了表面机械磨损处理 (SMAT) AISI 316L 不锈钢在有和没有聚合物和复合涂层的情况下的往复磨损行为。高性能芳香族热固性聚合物 (ATSP) 及其与 MoS _{2 的}复合材料使用旋涂技术沉积在非 SMATed 和 SMATed 钢上。此外，使用不同的负载和往复循环对氧化铝球在非 SMATed、SMATed 和涂层表面上进行往复磨损测试。增强的表面硬度（~89%）、α'（体心立方 [bcc] Fe）相的存在以及往复过程中较低的氧化导致 SMATed 表面的磨损损失和摩擦系数 (COF) 降低~在 15 N 负载和最长的往复循环下，分别为 37% 和 ~20%。通过沉积ATSP聚合物和ATSP-MoS ₂复合涂层，钢的磨损损失和COF进一步降低。SMAT 工艺增强了涂层的附着力和耐久性。这种增强的耐久性降低了 ATSP 和 ATSP-MoS 的磨损损失和 COF₂复合涂层沉积在 SMATed 基板上。聚合物涂层使非 SMATed 和 SMATed 钢的 COF 分别降低了约 68% 和约 85%。根据复合涂层中 MoS ₂的浓度，非 SMATed 和 SMATed 试样的 COF 范围分别为 0.04 至 0.32 和 0.02 至 0.07。在~10 wt% MoS ₂下观察到复合涂层的最佳性能。复合涂层钢的 COF 比未涂层和未处理的钢表面的 COF 低约 96%。基材和ATSP-MoS ₂复合涂层的SMAT 处理显着提高了AISI 316L 钢的摩擦学性能。