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HomeSolid State PhenomenaSolid State Phenomena Vol. 295High Performance Unalloyed Ductile Cast Iron with...

High Performance Unalloyed Ductile Cast Iron with Multiphase Structure

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Abstract:

An unalloyed ductile cast iron with a multiphase structure is designed by a novel austempering process. The designed austempering treatment consists of initial rapid quenching to 180°C after austenizing at 890°C for 20min, and finally austempering at 220°C for 240min. A multiphase structure comprising lenticular/needle-like prior martensite, fine needle bainitic ferrite and film retained austenite is obtained. The excellent mechanical properties, with a tensile strength of 1530MPa and an elongation of 3.1% can be achieved by controlling the matrix microstructure of 12% prior martensite, 15% retained austenite with 1.64% carbon content, and 73% bainitic ferrite. This is mainly attributed to prior marteniste which can promote refinement of multiphase colonies.

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Materials and Manufacturing Technology

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Periodical:

Solid State Phenomena (Volume 295)

Pages:

43-48

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.295.43

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Online since:

August 2019

Authors:

Wen Tao Zhou, Chen Yang, Xi Xi Cui, Zhong Yang Liang, Xuan Wang, Derek O. Northwood, Cheng Liu*

Keywords:

Ductile Iron, Isothermal Quenching, Multiple Structure, Tensile Strength

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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