Abstract
Wear-resistant coatings can reduce the high economic damage caused by wear processes. In this study, various protective layers based on the alloy X400CrVMo17-15-2 were investigated. Commonly, the prealloyed metal powder is used for plasma transferred arc powder surfacing. However, in this work, the cost-efficient hardpaint technology was used to produce particle-reinforced (fused tungsten carbides) and non-reinforced coatings. To analyze the wear behavior, the coatings were subjected to abrasion wear and scratch tests. For the abrasion wear test, a grinding pin (Al2O3) is pressed with a defined force against the surface of the rotating sample for 6 h. For the scratch test, a loaded diamond pyramid indenter was employed to create a circular groove on the coatings at a predefined speed. The wear grooves were analyzed with the aid of laser scanning microscopy. In comparison to the coatings in the as-processed condition, the non-reinforced protective layers were investigated after quenching, with and without deep cryogenic treatment, and tempering. The determination of proper heat treatment parameters was supported by computational thermodynamics. It has been confirmed that it is possible to improve the wear resistance of the unreinforced coatings by heat treatment. However, the reinforced layers showed the highest resistance against abrasion.
Highlights
Wear is understood as the undesired, progressive loss of material from the surface of a tribologically stressed solid [1,2]
To analyze the wear behavior, the coatings were subjected to abrasion wear and scratch tests
To examine the influence of heat treatment on the abrasive wear resistance of the hardpaint coatings, scratch tests were carried out using a TRM 1000 tribometer from Wazau Mess- und Prüfsysteme GmbH
Summary
Wear is understood as the undesired, progressive loss of material from the surface of a tribologically stressed solid [1,2]. There are numerous different methods for the production of such layers, e.g., HVOF (high velocity oxygen fuel spraying) [6], build-up welding [7], HIP (hot isostatic pressing) cladding [8], sinter cladding [9], or inductive cladding [10] To produce these coatings, prealloyed metal powders based on iron, nickel or cobalt are commonly used. As an alternative to conventional tempering, deep cryogenic treatment is a proper method to transform RA into martensite, and to improve the resistance against abrasion [15] Another effective measure to increase the abrasive wear resistance is the addition of hard particles to a metallic matrix [12,16]. For iron-based materials, this can be achieved by martensitic hardening It is unknown whether it is possible to modify the wear resistance of these hardpaint coatings through subsequent heat treatment.
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