Comparing Microstructures and Tensile Properties of Intercritically Annealed and Quenched-Tempered 1.7Ni-1.5Cu-0.5Mo-0.2C Powder Metallurgy Steels

GÜRAL A., BAŞAK H., Turkan M.

PHYSICS OF METALS AND METALLOGRAPHY, cilt.119, sa.1, ss.60-68, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 119 Sayı: 1
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1134/s0031918x18010027
  • Dergi Adı: PHYSICS OF METALS AND METALLOGRAPHY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.60-68
  • Anahtar Kelimeler: powder metallurgy, tensile properties, intercritical annealing, dual phase microstructure, ferrite plus martensite, DUAL-PHASE STEELS, MARTENSITE VOLUME FRACTION, P/M STEELS, MECHANICAL-PROPERTIES, DEFORMATION-BEHAVIOR, IMPACT TOUGHNESS, HEAT-TREATMENT, FATIGUE, FRACTURE, SIZE
  • Gazi Üniversitesi Adresli: Evet

Özet

The aim of this study was to compare the influence of intercritical quenching (IQ), step quenching (SQ) and quenching plus tempering (QT) heat treatments on the microstructure and tensile properties of 1.7Ni-1.5Cu-0.5Mo-0.2C pre-alloyed powder metallurgy (P/M) steels. In the microstructures of the IQ and SQ specimens partial martensite having Ni-rich phases formed up in the soft ferritic matrix. It was observed that unlike Mo, a Cu alloying element dissolved homogeneously in the specimens. The martensite volume fraction (MVF) in the SQ specimens was higher than that in the IQ specimens. It was found that macrohardness, yield and tensile strengths increased, whereas microhardness of ferrite and elongation decreased with increasing MVF. However, with this increase, microhardness values of martensite phases decreased in the IQ specimen, while they increased in SQ specimens. It was observed that the yield, tensile, and elongation values of the QT specimens were lower than those of all intercritically annealed specimens having the same hardness values.