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Accelerated Nano Super Bainite in Ductile Iron

Published online by Cambridge University Press:  15 May 2018

Eric Jiahan Zhao ,
Cheng Liu  and
Derek O. Northwood
Eric Jiahan Zhao*
Affiliation:
Beijing New Oriental Foreign Language School at Yangzhou, Yangzhou, Jiangsu, P R China
Cheng Liu
Affiliation:
College of Mechanical Engineering, Yangzhou University, Yangzhou, Jiangsu, P R China
Derek O. Northwood
Affiliation:
Mechanical, Auto and Materials Engineering, University of Windsor, Windsor, Ontario, Canada
*
*(Email: ericzhao2002@sina.cn)
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Abstract

A commercial unalloyed ductile iron has been developed to produce a multiphase matrix microstructure consisting of lenticular prior martensite, feathery upper bainite and a nano-scaled super bainite of lath bainitic ferrite and carbon-enriched film retained austenite. Multi-step heat treatment composed of austenizing, rapidly quenching and isothermally holding at low temperature have been developed. A tensile strength of more than 1.6 GPa, a hardness higher than HRC 54, and an elongation in excess of 5%, are achieved. This is attributed to a synergistic multi-phase strengthening effect. The developed nano super bainite exhibits a good balance between strength and toughness. The presence of martensite formed during the quenching prior to the isothermal treatment, accelerates the kinetics of subsequent nano super bainitic transformation by bainitic laths nucleating quickly at the martensite-austenite interfaces.

Keywords

phase transformationhardnessmicrostructurenanostructurestrength
Type
Articles
Information
MRS Advances , Volume 3 , Issue 45-46: Nanomaterials , 2018 , pp. 2789 - 2794
Copyright
Copyright © Materials Research Society 2018 

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