Performance of a Matrix Type High Speed Steel after Deep Cryogenic and Low Tempering Temperature

Abstract:

A matrix type high speed steel YXR3 designed for a combination of wear resistance and toughness is investigated for its mechanical properties after hardening by deep cryogenic treatment follow by tempering. The deep cryogenic quenching carried out at -200 °C for 36 hours and the single step tempering results in an obvious improvement in wear resistance while balancing the toughness, comparing with the conventional quenching followed by a double tempering treatment. The quantitative image analysis reveals little difference in the MC carbide size distribution between tempering at different temperatures. The synchrotron high energy XRD confirms the MC type carbide with some evolution in its orientation together with tempered martensite approaching the BCC structure at higher temperatures. In contrary to the conventional quenching and tempering, the lowest tempering temperature at 200 °C yields a moderate drop in hardness with increase in surface toughness proportionally while exhibiting exceptional wear resistance. Such thermal cycle can be recommended for the industry both for the practicality and improved tool life.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1423-1429
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1423
• Online since: January 2021
• Authors: Kaweewat Worasaen, Andreas Stark, Karuna Tuchinda, Piyada Suwanpinij*
• Keywords: Deep Cryogenic Treatment, High Speed Steel, MC Carbide, Tempered Martensite

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