Effects of post annealing on the microstructure, mechanical properties and cavitation erosion behavior of arc-sprayed FeNiCrBSiNbW coatings. (January 2015)

• Record Type: Journal Article
• Authors: Lin, Jinran; Wang, Zehua; Lin, Pinghua; Cheng, Jiangbo; Zhang, Xin; Hong, Sheng
• Is Part Of: Materials & design. Volume 65(2015:Jan.)
• Page Start: 1035
• Page End: 1040
• Publication Date: 2015-01
• Subjects: Iron-based amorphous coating -- Cavitation erosion -- Annealing -- Arc spraying; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2014.10.066
• Languages: English
• ISSNs: 0264-1275

Abstract

Highlights: FeNiCrBSiNbW coatings were prepared by arc spraying process. Microstructural changes of the coatings were investigated by TEM. As-sprayed coating had higher cavitation erosion resistance than annealed coatings. The mechanism for annealing-induced change in cavitation erosion was discussed. Abstract: FeNiCrBSiNbW coatings were fabricated via arc spraying process and were subsequently annealed at 450, 550 and 650 °C for 1 h to study the effect of annealing treatment on the microstructure, mechanical properties and cavitation erosion behavior. Microstructure was studied using scanning and transmission electron microscopy. The results showed that oxides, fine crystalline particles and borides were formed after annealing at 650 °C. With increasing annealing temperature, the coatings showed reductions in porosity and fracture toughness, and an increase in microhardness. The cavitation erosion behavior of the coatings was investigated in distilled water. The results showed that the cavitation erosion resistance of the coatings decreased with increasing annealing temperature, and the as-sprayed coating exhibited the best cavitation erosion resistance among the four kinds of coatings. This was attributed to the good fracture toughness, high amorphous phase content and the absence of oxides in the as-sprayed coating.