Surface layer alterations in AISI 4140 Steel from turn-assisted deep cold rolling process

Prabhu, P R and Kulkarni, S M and Sharma , S S and Jagannath, K (2014) Surface layer alterations in AISI 4140 Steel from turn-assisted deep cold rolling process. In: Second international conference on Current Trends in Engineering and Management ICCTEM-2014, 17-19 July 2014, Vidyavardhaka College of Engineering, Mysore.

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Abstract

Mechanical surface enhancement (MSE) techniques have been used to modify the surface reliability properties of many materials by generating ultrafine or even nanometer-sized grains in the surface and subsurface region. These fine grained materials created by mechanical surface enhancement techniques usually have higher hardness and frequently exhibit enhanced mechanical properties. Turn-assisted deep cold rolling (TADCR) process is used to improve the surface integrity of AISI 4140 steel which is commonly used in automobile industry. Turn-assisted deep cold rolling is particularly attractive since it is possible to generate, near the surface, deep residual compressive stresses and work hardened layers while retaining a relatively smooth surface finish. Microstructure alteration to a depth of around 300µm was obtained from turn-assisted deep cold rolling process, which reflects an increase in residual compressive stress from as-turned material. Microhardness measurements indicate that the hardness in the small grained layer created by turn-assisted deep cold rolling is increased by about 36% related to the bulk value. Current results show that turn-assisted deep cold rolling could be an effective processing method to modify the surface integrity of AISI 4140 steel.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Surface integrity, microstructure, deep cold rolling, AISI 4140 steel, microhardness
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 22 Jul 2014 05:01
Last Modified: 22 Jul 2014 05:01
URI: http://eprints.manipal.edu/id/eprint/140198

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