Influence of martensite particle size on dry sliding wear behaviour of low carbon dual phase powder metallurgy steels

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Gural A.

KOVOVE MATERIALY-METALLIC MATERIALS, cilt.48, ss.25-31, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 48 Konu: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.4149/km_2010_1_25
  • Sayfa Sayıları: ss.25-31


This study aimed to investigate the effect of martensite particle size on dry sliding wear properties of dual phase PM steels. For this purpose, atomised iron powder with 0.3 wt.% graphite powder was cold pressed and sintered at 1200 degrees C. Some of the sintered specimens were annealed at intercritical heat treatment temperature of 750 degrees C and water-quenched to obtain coarse martensite region. The others were first austenitized at 890 degrees C, water-quenched and subsequently re-annealed at intercritical annealing temperature of 750 degrees C before rapidly water re-quenching to produce fine martensite size. Wear tests were performed in a pin-on-disc test device under 25 N load at 125 m min(-1) sliding speed. The wear rate decreased with decreasing martensite particle size due to the reducing inter-martensite particle spacing, increasing hardness of ferrite phases and decreasing cracking of fine martensite particles.