Effect of intercritical annealing on the microstructural and mechanical behaviours of dual-phase steels
The automotive industry is the main consumer of dual-phase (DP) steels which have relatively impressive mechanical strength. DP steels are also known to have good ductility and load-bearing property because of their hard martensitic microstructure in soft ferrite grains. The main objective of th...
Saved in:
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Penerbit Universiti Kebangsaan Malaysia
2020
|
Online Access: | http://journalarticle.ukm.my/17200/1/10.pdf http://journalarticle.ukm.my/17200/ https://www.ukm.my/jkukm/volume-324-2020/ |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The automotive industry is the main consumer of dual-phase (DP) steels which have relatively impressive mechanical
strength. DP steels are also known to have good ductility and load-bearing property because of their hard martensitic
microstructure in soft ferrite grains. The main objective of this study is to determine the mechanical behaviour of DP steels
with various martensite volume fractions. A heat treatment with an intermediate quenching procedure followed by three
different intercritical temperatures is conducted to produce various ferrite–martensite containing DP steels with different
martensite volume fractions (Vm
). Vm
affects the mechanical properties of steel, such as work hardening, ultimate tensile
strength, yield strength and hardness. The results of the experiments conducted in this study prove that excellent work
hardening and ductility are observed for DP steels with a low amount of martensite phase. Meanwhile, DP steels with high
Vm
exhibit high tensile strength and hardness with low ductility. Considère criterion is used to analyse the work hardening
behaviour of DP steels. Results indicate that a one-stage work hardening takes place in DP steels; according to Considère
criterion, instability strain or uniform elongation is also slightly increased by decreasing the martensite volume fraction or
increasing the work hardening rate. |
---|