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Effect of multi-step tempering on retained austenite and mechanical properties of low alloy steel

Bakhsheshi Rad, Hamid Reza and Monshi, Ahmad and Monajatizadeh, Hossain and Idris, Mohd. Hasbullah and Abdul Kadir, Mohammed Rafiq and Jafari, Hassan (2012) Effect of multi-step tempering on retained austenite and mechanical properties of low alloy steel. Journal of Iron and Steel Research International, 18 (12). pp. 49-56. ISSN 1006-706X

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Official URL: http://dx.doi.org/10.1016/S1006-706X(12)60009-0

Abstract

The effect of multi-step tempering on retained austenite content and mechanical properties of low alloy steel used in the forged cold back-up roll was investigated. Microstructural evolutions were characterized by optical microscope, X-ray diffraction, scanning electron microscope and Feritscope, while the mechanical properties were determined by hardness and tensile tests. The results revealed that the content of retained austenite decreased by about 2% after multi-step tempering. However, the content of retained austenite increased from 3.6% to 5.1% by increasing multi-step tempering temperature. The hardness and tensile strength increased as the austenitization temperature changed from 800 to 920 °C, while above 920 °C, hardness and tensile strength decreased. In addition, the maximum values of hardness, ultimate and yield strength were obtained via triple tempering at 520 °C, while beyond 520 °C, the hardness, ultimate and yield strength decreased sharply.

Item Type:Article
Uncontrolled Keywords:Iron and steel research
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Mechanical Engineering
ID Code:46861
Deposited By: Haliza Zainal
Deposited On:22 Jun 2015 05:56
Last Modified:26 Sep 2017 01:34

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