Investigation on the Influence of Tempering on Microstructure and Wear Properties of High Alloy Chromium Cast Iron

• Published in: Advances in materials science 2021-06, Vol.21 (2), p.65-76
• Main Authors: Younes, Rassim, Sadeddine, Abelhamid, Bradai, Mohand Amokrane, Aissat, Sahraoui, Benabbas, Abderrahim
• Format: Article
• Language: English
• Subjects: Alloys; Carbides; Cast iron; Charpy impact test; Chemical elements; Chromium; Heat treatment; High-alloy chromium cast iron; Impact resistance; Investigations; Laboratories; Martensite; Materials science; Mechanical properties; Microstructure; resilience; Tempering; Tribology; wear; Wear resistance; Weight loss measurement; X-ray diffraction; X-rays
• ISSN: 2083-4799; 1730-2439; 2083-4799
• DOI: 10.2478/adms-2021-0011

Mechanical properties, wear resistance and impact resistance of a high-alloy chromium cast iron used in the fabrication of grinding balls have been studied. A rank of tempering heat treatments under several temperatures 500°C, 525°C, 550°C and 575°C was performed after austenitized at 1050°C. The Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) techniques have been used to characterize the microstructures and identify the phases. The wear balls tests were conducted in a rotating drum with a velocity 0.5 r/s. The tribological tests were carried out by evaluated a weight loss as function time. The measurement of the rebound resilience was determined by Charpy impact tests. The results of XRD showed the presence of the martensite, carbides type M and M C for all tempering heat treated. The hardness of the sample increased after the tempering and reach nearly 65 HRC at 1050°C. In another hand, it decreased after the tempering treatment it could be explained by precipitation of the carbides type M C.