Home Kovove Materialy-Metallic Materials 2010 Metallic Materials Vol. 48 (2010), no. 1, pp. 25- 31

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Metallic Materials Vol. 48 (2010), no. 1, pp. 25- 31

Title: Influence of martensite particle size on dry sliding wear behaviour of low carbon dual phase powder metallurgy steels
Author: GURAL, A.

Abstract: 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 °C. Some of the sintered specimens were annealed at intercritical heat treatment temperature of 750 °C and water-quenched to obtain coarse martensite region. The others were first austenitized at 890 °C, water-quenched and subsequently re-annealed at intercritical annealing temperature of 750 °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.

Keywords: powder metallurgy steel, sintering, dual phase steel, martensite particle size, dry sliding wear
Year: 2010, Volume: 48, Issue: 1 Page From: 25, Page To: 31

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