Acta Metallurgica Sinica (English Letters) >
Bake-Hardening Response of High Martensite Dual-Phase Steel with Different Morphologies and Volume Fractions
Received date: 2013-06-25
Revised date: 2013-09-27
Online published: 2014-05-07
Bake-hardening behaviour of carbon steel with different martensite morphologies and volume fraction was investigated. The specimens with fibrous and bulky martensite were prestrained in tension by 4%. After this, they were unloaded and bake hardened at 180 °C for 10–160 min. It was found that dual-phase steel samples which were bake hardened at 180 °C for 20 min showed an increase in the yield stress (YS) and ultimate tensile stress (UTS) but a decrease in ductility. Further increase in the bake-hardening time of 80 or 160 min has reduced the YS and UTS, but increased the ductility. Δσ (increase in stress due to bake hardening), YS and UTS values are higher for the microstructure containing fibrous martensite compared to the microstructure-containing bulky martensite. It was also observed that at a given baking temperature Δσ, YS and UTS increased by volume of martensite.
Key words： Dual-phase steel; Bake hardening; Martensitic transformation
Mustafa Türkmen , Süleyman Gündüz . Bake-Hardening Response of High Martensite Dual-Phase Steel with Different Morphologies and Volume Fractions[J]. Acta Metallurgica Sinica (English Letters), 2014 , 27(2) : 279 -289 . DOI: 10.1007/s40195-014-0043-5
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