Influences of Heat Treatment on Microstructure and Wear Resistance of WCp/40CrNi2Mo Metal Matrix Composites

Abstract:

A metal matrix composite 40CrNi2Mo strengthened with nanoscale WC particulate was fabricated through conventional casting in this work. The microstructure, hardness and wear resistance of this material were studied. The diffusion annealing processing was conducted at 900°C for 6.5h, and the quenching process with oil at 880°C for 2h. The temper process was conducted at 180°C, 220°C, 260°C and 500°C for 2h. It was found that the WC particulates surrounding the Fe3C phase were distributed evenly within the matrix. The segregation was discovered in the cast and was eliminated through annealing at the cost of hardness. The quenching, annealing at 180°C for 2hrs plus air cooling induced the tempered martensite, some ferrite and few retained austenite. The microstructure changed into the tempered sorbite after tempering at higher temperatures. The amount of precipitated carbides increased with the tempering temperature, but the hardness decreased gradually. Diffusion tempering, treated at 880°C for 2h followed by oil quenching, annealing at 180°C for 2h plus air cooling can give rise to the best wear resistance, which equals to 124.5% of the material currently employed.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 632-637
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.632
• Online since: April 2014
• Authors: Lin Yang*, Li Qiang Deng, Yang Han, Ya Ling Han
• Keywords: Heat Treatment, Matrix Composites, WC, Wear Resistance

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