Characteristics Evaluation of Normalized and Conventionally Hardened AISI 4340 steel

Gurumurthy, B M and Murthy, Amar A and Hindi, Jamaluddin and Sharma , S S and Kini, Achutha U (2015) Characteristics Evaluation of Normalized and Conventionally Hardened AISI 4340 steel. In: 5th International Conference on Automotive, Mechanical and Materials Engineering, August 16-17, 2015, Bali (Indonesia).

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The mechanical properties of steel decide its applicability for a particular condition. Heat treatment processes are commonly used to enhance the required properties of steel starting from a simple crankshaft of two wheelers to the robust turbine blades. The type of heat treatment that equipment demands depends on its use and ability of the metal to undergo phase transformation with respect to different non equilibrium cooling rates. The present work aims at experimentally investigating the effects of normalizing, and conventional hardening on the hardness, microstructure and toughness of AISI 4340 steel. The material was machined to ASTM standards and then different tests like microstructure analysis, hardness test, impact test, and were carried out after the heat treatment processes. All the tests were carried as per ASTM standards and compared with as bought steel. It was found that normalized steel has got lower hardness than conventionally hardened steel. The ASTM grain size is used to compare the grain size of different phases obtained with and without heat treatment. An increase in brittleness was observed with the increase in hardness during conventional hardening

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Normalizing, hardening, AISI 4340, microstructure, toughness.
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 07 Sep 2015 08:57
Last Modified: 07 Sep 2015 08:57

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