Journal Published Online: 10 September 2018
Volume 8, Issue 2

A Study on the Effect of Austempering Temperature on Microstructure and Mechanical Properties of DIN 36CrNiMo4 Carbide-Free Nano Bainitic Steel

CODEN: MPCACD

Abstract

In this study, the effects of the austempering temperature on the microstructure and mechanical properties of carbide-free nano bainitic steel (CFB) were discussed. For the achievement of CFB 2 wt. %, silicon was added to DIN 36CrNiMo4 steel, austempered at 450°C and 300°C for 1.5 hours and 10 hours, respectively, and then quenched in oil. The microstructure was studied by optical microscope, scanning electron microscope, and X-ray crystallography. The results showed that the 300°C austempered samples contained the ferrite phase to a greater degree than the martensitic phase. The higher amounts of martensite in the 450°C austempered samples were due to the higher amounts of initial retaining austenite that transformed to martensite in oil quenching. Also, in the samples where carbide participated, there were lower degrees of the martensitic phase, and no carbides afford higher impact toughness and lower hardness for the 300°C austempered sample. As a result of the higher impact toughness in the ball mill wear test, the 300°C austempered sample has a lower weight loss than the 450°C austempered sample.

Author Information

Garmeh, Behdad
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Kasiri-Asgarani, Masoud
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Amini, Kamran
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran Department of Mechanical Engineering, Tiran Branch, Islamic Azad University, Tiran, Isfahan, Iran
Ghayour, Hamid
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Pages: 8
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Stock #: MPC20180022
ISSN: 2379-1365
DOI: 10.1520/MPC20180022