Wear behavior of CADI obtained at different austenitizing temperatures. (December 2019)

• Record Type: Journal Article
• Authors: Penghui, Yang; Hanguang, Fu; Xiangwei, Zhao; Jian, Lin; Yongping, Lei
• Is Part Of: Tribology international. Volume 140(2019)
• Publication Date: 2019-12
• Subjects: Austenitizing temperature -- Carbidic austempered ductile iron -- Dry sliding wear -- Corrosive wear; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2019.105876
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The microstructure, mechanical properties and wear resistance of carbidic austempered ductile iron (CADI) obtained at different austenitizing temperatures were investigated. The dry sliding wear failure mechanism in block-on-ring tester and erosive wear failure mechanism of CADI in the slurry of pH = 4, pH = 10 were analyzed. The results show that with the increase of austenitizing temperature, the hardness and tensile strength of CADI first increase and then decrease, and the wear loss decreases first and then increases. The shedding of carbides in corrosive media and the deformation of the matrix around the graphite nodules are the main failure mechanisms in corrosive wear. In addition, abrasive wear and adhesive wear are the main failure mechanism under dry sliding wear condition. Highlights: Impact toughness of CADI increases with the increase of austenitizing temperature. Wear resistance of CADI rises and then reduces as the austenitizing temperature rises. Large number of corrosive pits appeared on the worn surface in the slurry of pH = 4. At alkaline conditions with pH = 10, wear might be play a leading role. The deformation of matrix around the graphite spheres occurred during corrosive wear.