Influence of Multi-Step Austempering Temperature on Tensile Performance of Unalloyed Ductile Iron

Wei Ci Zhuang; Ying Ming Jiang; Wen Tao Zhou; Zhong Yang Liang; Derek O. Northwood; Cheng Liu

doi:10.4028/www.scientific.net/KEM.803.3

Paper Titles

Preface

Influence of Multi-Step Austempering Temperature on Tensile Performance of Unalloyed Ductile Iron
p.3

Microstructures and Mechanical Properties of Friction Welded Steel Tubes
p.13

Grain Refining Effect of Al-5Ti-1B Master Alloy on Microstructures and Mechanical Properties of A356 Alloy
p.17

Severe Plastic Deformation of Al-15Zn-2Mg Alloy: Effect on Wear Properties
p.22

Experimental and Simulation Method of Introducing Compressive Residual Stress in ASTM A516 Grade 70 Steel
p.27

Effect of Linear Energy Density on Bubble-Defect of 316L Stainless Steel by Selective Laser Melting
p.32

Effect of Solution Treatment Time on Microhardness of High Nitrogen Austenitic Stainless Steel
p.37

HomeKey Engineering MaterialsKey Engineering Materials Vol. 803Influence of Multi-Step Austempering Temperature...

Influence of Multi-Step Austempering Temperature on Tensile Performance of Unalloyed Ductile Iron

Abstract:

Austempered ductile iron (ADI) has been widely used in various industries due to its excellent combination of high strength, ductility and good wear resistance. The tensile behavior of an unalloyed commercial ADI with a multiphase structure designed by a novel multi-step austempering treatment is investigated. The developed austempering process consists of austenitizing at 890°C for 20min, then initial rapid quenching to 180°C, and isothermal holding at 190, 220, 250°Cfor 120min, and finally air cooling to room temperature. The optimum mechanical properties with an ultimate tensile strength of 1350MPa, a yield strength of 1090MPa, as well as an elongation of 3.5% is achieved at 220°C. This is attributed to a synergistic strengthening effect of multiphase structure including a prior martensite with fine needle bainitic ferrite and film retained austenite.

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Key Engineering Materials (Volume 803)

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3-7

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.803.3

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Online since:

May 2019

Authors:

Wei Ci Zhuang*, Ying Ming Jiang, Wen Tao Zhou, Zhong Yang Liang, Derek O. Northwood, Cheng Liu

Keywords:

Austempered Ductile Iron, Austempering Treatment, Multiphase Microstructure, Ultimate Tensile Strength

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