Thermal treatments & characteristics study on unalloyed structural (AISI 1140) steel

Sharma , S S and Prabhu, P R and Chadaga, R C (2010) Thermal treatments & characteristics study on unalloyed structural (AISI 1140) steel. World Academy of Science, Engineering and Technology, 70. pp. 770-775. ISSN 2010-3778

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Abstract

The main emphasis of metallurgists has been to process the materials to obtain the balanced mechanical properties for the given application. One of the processing routes to alter the properties is heat treatment. Nearly 90% of the structural applications are related to the medium carbon an alloyed steels and hence are regarded as structural steels. The major requirement in the conventional steel is to improve workability, toughness, hardness and grain refinement. In this view, it is proposed to study the mechanical and tribological properties of unalloyed structural (AISI 1140) steel with different thermal (heat) treatments like annealing, normalizing, tempering and hardening and compared with as brought (cold worked) specimen. All heat treatments are carried out in atmospheric condition. Hardening treatment improves hardness of the material, a marginal decrease in hardness value with improved ductility is observed in tempering. Annealing and normalizing improve ductility of the specimen. Normalized specimen shows ultimate ductility. Hardened specimen shows highest wear resistance in the initial period of slide wear where as above 25KM of sliding distance, as broug ht steel dominates the hardened specimen. Both mild and severe wear regions are observed. Microstructural analysis shows the existence of pearlitic structure in normalized specimen, lath martensitic structure in hardened, pearlitic, ferritic structure in annealed specimen.

Item Type: Article
Uncontrolled Keywords: Annealing, hardness, Heat treatment, normalizing, wear
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 27 Feb 2013 10:41
Last Modified: 27 Feb 2013 10:41
URI: http://eprints.manipal.edu/id/eprint/78773

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