Effects of Zero Time Holding Quenching Temperature on Tempering Microstructure and Mechanical Properties of 40Cr Steel

Abstract:

The effects of different zero-holding quenching temperatures on the tempering microstructure, mechanical properties and wear resistance of 40Cr were studied. The results showed that the microstructure of 40Cr was tempered sorbite and a small amount of unmelted ferrite after quenching at 850 °C and tempering at 550 °C for 2 h. Tempered sorbite was obtained after quenching at 880 °C～910 °C and tempering at 550 °C for 2 h. With the increasing of quenching temperature at zero holding temperature, the tensile strength and yield strength of 40Cr increased, while the elongation and impact toughness decreased. With the decreasing of impact test temperature, the ballistic work of 40Cr decreased gradually, and decreased fastest between 0 °C～-20 °C. 40Cr had the best impact performance after quenching at 850 °C and tempering at 550 °C for 2 h. 40Cr had the smallest wear loss after quenching at 880 °C and tempering at 550 °C for 2 h. Its wear marks were smooth, and had the shallowest furrows and ridges.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 492-496
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.492
• Online since: May 2020
• Authors: Peng Xiao Zhu*, Yi Li, Bo Chen, Kun Feng
• Keywords: 40Cr, Abrasion Loss, Ballistic Work, Mechanical Properties

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