Thermal treatments & characteristics study on Unalloyed Structural (AISI 1140)steel

Sharma , S S and Prabhu, P R and Chadaga, RajGopal P (2010) Thermal treatments & characteristics study on Unalloyed Structural (AISI 1140)steel. In: International Conference on Mechanical and Industrial Engineering (ICMIE 2010), August 25-27,, Singapore.

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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 4140) 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 brought 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: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Heat treatment, normalizing, annealing, wear, hardness
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 23 Mar 2013 11:24
Last Modified: 23 Mar 2013 11:24
URI: http://eprints.manipal.edu/id/eprint/79261

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