Paper Title:

Tempering Response to Different Morphologies of Martensite in Tensile Deformation of Dual-Phase Steel

Periodical Key Engineering Materials (Volumes 510 - 511)
Main Theme Advanced Materials XII
Edited by Shaheed Khan, Iftikhar us Salam and Karim Ahmed
Pages 80-88
DOI 10.4028/www.scientific.net/KEM.510-511.80
Citation E. Ahmad et al., 2012, Key Engineering Materials, 510-511, 80
Online since May, 2012
Authors E. Ahmad, T. Manzoor, M. Sarwar, M. Arif, N. Hussain
Keywords Dual-Phase Steel, Heat Treatment, Microstructure, Tempering, Tensile Properties
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Abstract

A low alloy steel containing 0.2%C was heat treated with three cycles of heat treatments with the aim to acquire different morphologies of martensite in dual phase microstructure. Microscopic examination revealed that the morphologies consisting of grain boundary growth, scattered laths and bulk form of martensite were obtained. These morphologies have their distinct patterns of distribution in the matrix (ferrite). In tensile properties observations the dual phase steel with bulk morphology of martensite showed minimum of ductility but high tensile strength as compared to other two morphologies. This may be due to poor alignments of bulk martensite particles along tensile axes during deformation. Tempering was employed with various holding times at 550°C to induce ductility in the heat treated material. The tempering progressively increased the ductility by increasing holding time. However, tempering response to strengths and ductilities was different to all three morphologies of martensite.