Abstract

Electroless Ni-P-Ti composite coatings were deposited on AISI 1018 steel substrates by incorporating Ti nanoparticles into a Ni-P matrix. It was then followed by annealing to form the NiTi intermetallic precipitates within the coatings. In this study, single-particle erosion behavior of both as-deposited and annealed coatings was investigated. It was found that the erosion behavior of the coatings changes from a brittle (as-deposited) to a ductile erosion behavior (annealed) due to the formation of superelastic NiTi phase. Stress distribution during the single-particle impact process was calculated to facilitate the understanding of toughening and erosion mechanisms. Crack shielding and crack closing induced by transformation toughening were observed in the vicinity of the impact crater on the annealed 11.8 wt.% coating. This study discusses the erosion and toughening mechanisms of Ni-P-Ti composite coatings.

中文翻译：

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化学镀Ni-P-Ti复合涂层的单颗粒冲蚀行为研究

摘要

通过将Ti纳米粒子掺入Ni-P基质中，将化学镀的Ni-P-Ti复合涂层沉积在AISI 1018钢基底上。然后进行退火，以在涂层内形成NiTi金属间沉淀。在这项研究中，研究了沉积和退火涂层的单颗粒腐蚀行为。已经发现，由于超弹性NiTi相的形成，涂层的腐蚀行为从脆性（沉积）变为延性腐蚀行为（退火）。计算了单颗粒撞击过程中的应力分布，以促进对增韧和腐蚀机理的理解。在退火的11.8wt。％的涂层上的冲击坑附近观察到由转变增韧引起的裂纹屏蔽和裂纹闭合。