Effect of aging temperature and martensite by volume on strain aging behaviour of dual phase steel


Guenduez S., Demir B., Kacar R.

IRONMAKING & STEELMAKING, cilt.35, ss.63-68, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 35 Konu: 1
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1179/174328107x203949
  • Dergi Adı: IRONMAKING & STEELMAKING
  • Sayfa Sayıları: ss.63-68

Özet

A study has been made of the cold deformation aging susceptibility of dual phase steel with 14 and 22% martensite by volume. It was found that yield strength (YS) and ultimate tensile strength (UTS) increased with increasing testing temperature up to 200 degrees C and then decreased at 250 degrees C which indicated that static strain aging is dominant up to 200 degrees C. This aging is associated with free dislocations in the ferrite as a result of the austenite-martensite transformation, which become preferential sites for solute atom diffusion. At higher temperature (250 degrees C) a softening effect is dominant due to tempering of martensite. It was also observed that at a given aging temperature YS, UTS and Delta Y (increase in stress due to strain aging) increased with by volume of martensite.