Microstructural Characteristics and Mechanical Properties of Low-Alloy, Medium-Carbon Steels After Multiple Tempering

LUO, Quanshun, ABBASI, Erfan and OWENS, Dave (2019). Microstructural Characteristics and Mechanical Properties of Low-Alloy, Medium-Carbon Steels After Multiple Tempering. Acta Metallurgica Sinica, 32 (1), 74-88.

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Official URL: https://link.springer.com/journal/40195
Link to published version:: https://doi.org/10.1007/s40195-018-0805-6


The microstructure and mechanical properties of NiCrMoV- and NiCrSi-alloyed medium-carbon steels were investigated after multiple tempering. After austenitising, the steels were hardened by oil quenching and subsequently double or triple tempered at temperatures from 250 to 500 °C. The samples were characterised using scanning electron microscopy and X-ray diffraction, while the mechanical properties were evaluated by Vickers hardness testing, V-notched Charpy impact testing and tensile testing. The results showed that the retained austenite was stable up to 400 °C and the applied multiple tempering below this temperature did not lead to a complete decomposition of retained austenite in both steels. It was also found that the microstructure, hardness and impact toughness varied mainly as a function of tempering temperature, regardless of the number of tempering stages. Moreover, the impact toughness of NiCrMoV steel was rather similar after single/triple tempering at different temperatures, while NiCrSi steel exhibited tempered martensite embrittlement after single/double tempering at 400 °C. The observed difference was mainly attributed to the effect of precipitation behaviour due to the effect of alloying additions in the studied steels.

Item Type: Article
Uncontrolled Keywords: Medium-carbon steels; Multiple tempering; Alloying addition; Mechanical properties; Retained austenite; Precipitation behaviour
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Materials Analysis and Research Services
Identification Number: https://doi.org/10.1007/s40195-018-0805-6
Page Range: 74-88
Depositing User: Quanshun Luo
Date Deposited: 20 Sep 2018 13:50
Last Modified: 28 Jan 2019 10:18
URI: http://shura.shu.ac.uk/id/eprint/22499

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