![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
In the present research, a nickel base coating was deposited on an AISI 1020 substrate using a high-velocity oxy-fuel technique. The coating was subsequently heat treated (HT) by means of an oxyacetylene flame. For the conditions evaluated in the present study, it was found that the HT coating has 1.15 times better wear resistance for the lower level of applied load and lower sliding speed (SS), and nearly 50 times better resistance for the highest level of the applied load and highest SS when compared with the non-HT coatings. These results have been attributed to a better distribution of the hardening phases, better cohesion between particles and an increase in hardness, as a consequence of the post-deposition heat treatment process. A severe wear regime was found for all the samples, since the wear rates presented values which were higher than 1 × 10− 5 mm3/m. The presence of the adhesion, oxidization, three-body abrasion, and cyclical deterioration phenomena, all competing with each other, was noted. For the HT coatings, the wear mechanism was mainly due to the adhesion and oxidisation phenomena, while for the steel counterpart mechanisms such as oxidization, grooving and three-body abrasion were observed.