Mechanical property assessment of austempered and Conventionally hardened AISI 4340 Steel

Sharma , S S and Jagannath, K and Prabhu, P R and Gowri Shankar , M C (2014) Mechanical property assessment of austempered and Conventionally hardened AISI 4340 Steel. International Journal Of Mechanical Engineering And Technology , 5 (9). 08-14. ISSN 0976 – 6359

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Abstract

The chemical composition and mechanical properties of steel decide its applicability for manufacturing various components in different areas of engineering interests. Heat treatment processes are commonly used to enhance the required properties of steel with or without change in chemical composition. The present work aims to perform conventional hardening and Austempering treatment with experimental investigation of the effect of austempering and conventional hardening (quenching) on AISI 4340 steel. Different tests like tensile, torsion, hardness, impact and microstructure analysis are carried out in as bought and heat treated conditions. It was found that Austempering improves tensile, torsional and impact strength whereas a marginal decrease in hardness is found as compared to conventional hardening (direct quenching).Lower bainitic and martensitic structures are observed in austempered and conventionally hardened specimens.

Item Type: Article
Uncontrolled Keywords: Heat Treatment, Austempering, Martensite, Bainite, Hardening, Tensile.
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 08 Oct 2014 06:06
Last Modified: 08 Oct 2014 06:06
URI: http://eprints.manipal.edu/id/eprint/140789

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