شماره ركورد كنفرانس :
4562
عنوان مقاله :
Martensite Volume Fraction Effect on the Dual-Phase Steel Work Hardening Behavior
Author/Authors :
S Hatefi Materials Research Center - Faculty of Materials Engineering - Najafabad Branch Islamic Azad University, Najafabad , M Davari Materials Research Center - Faculty of Materials Engineering - Najafabad Branch Islamic Azad University, Najafabad , M Mansouri Materials Research Center - Faculty of Materials Engineering - Najafabad Branch Islamic Azad University, Najafabad
كليدواژه :
DP steels , heat treatment , martensite volume fraction , Holloman analysis , mixture rule
عنوان كنفرانس :
The Bi-Annual International Conference on Experimental Solid Mechanics and Dynamics ۲۰۱۶
چكيده لاتين :
The present study was aimed to evaluate the dual-phase (DP) steels work hardening behavior in terms of Holloman analysis. Low carbon steel (LCS) was annealed at various temperatures of 780, 800, 820 and 840°C in the Muffle furnace and the effect of the martensite volume fraction (VM) on DP steels work hardening behavior was investigated. The Results revealed that the VM increased from 31% to 66% with increasing annealing temperature from 780 to 840°C. The results of the work hardening mechanism in DP steels showed that with more than 66%VM two stages work hardening occurs and with less than (VM=31, 49 and 55%) one stage took place and the work hardening exponent increased with increasing Vm. Relationship between the VM and carbon content was evaluated by mixture rule and the result indicated that martensite W% decreases from 0.42 to 0.2. with increasing the temperature from 780 to 840°C. Moreover, Elongation and ratio of yield stress to tensile strength decreased with increasing VM.
