Fatigue life behaviour of the dual-phase low carbon steel sheets

Akay S. K., Yazici M., Bayram A., Avinc A.

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, cilt.209, sa.7, ss.3358-3365, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 209 Sayı: 7
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.jmatprotec.2008.07.038
  • Dergi Adı: JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3358-3365
  • Anahtar Kelimeler: Intermediate heat treatment, Dual phase steel, Fatigue life, Microstructure, MECHANICAL-PROPERTIES, HEAT-TREATMENT, MARTENSITE, TENSILE, MICROSTRUCTURE, MORPHOLOGY
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

This paper presents the effect of heat treatment on the fatigue life of low carbon steel sheet with dual-phase microstructure. The steel sheets were heat treated with two different procedures; intermediate quenching, intermediate quenching and tempering. The properties of tensile strength, fatigue life, hardness, micro hardness and microstructure were evaluated by the mechanical tests and metallographic analysis, respectively. The results showed that dual-phase steel (DPS) microstructures, composed by ferrite and martensite had higher fully reversed plane bending fatigue strength when compared with as-received steel and tempered martensite (TM) steel. The experimental results showed that fatigue life of the heat-treated steel sheets enhanced with increasing amount of martensite in the microstructure. The highest fatigue strength was observed on the intermediately annealed steel sheets at 870 degrees C. Internal microstructures, fatigue crack initiation and propagation of the heat-treated steel were analyzed by scanning electron microscopy (SEM). (c) 2008 Elsevier B.V All rights reserved