Investigations on microstructures and properties of B containing cast steel for wear resistance applications

Authors: Fu, H.G.; Lei, Y.P.; Xing, J.D.; Huang, L.M.

Source: Ironmaking & Steelmaking, Volume 35, Number 5, July 2008 , pp. 371-378(8)

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Abstract:

The microstructures of B bearing cast steel (B steel) containing 0·8-1·2 wt-%B, 0·8-1·2 wt-%Cr, 1·0-1·5 wt-%Mn, 0·6-1·0 wt-%Si and 0·10-0·25 wt-%C have been characterised by means of optical microscopy, scanning electron microscopy, electron probe microanalyser and X-ray diffraction. The solidification structure of B steel consists of pearlite, ferrite, martensite and boride (Fe₂B), while the hardness is 1430-1480 HV. Borides distribute along the grain boundary in the form of eutectic. Fine lath martensite and eutectic Fe₂B can be obtained by water quenching at 1223-1273 K. The hardness and impact toughness of the B steel exceed 55 HRC and 150 kJ m⁻²respectively. The abrasion resistance determined using a pin abrasion tester is obviously higher than that of the martensitic cast steel and nears to the high chromium white cast iron.

Keywords: B BEARING CAST STEEL; SOLIDIFICATION MICROSTRUCTURE; QUENCHING; BORIDES; LATH MARTENSITE; MECHANICAL PROPERTIES

Document Type: Research article

DOI: 10.1179/174328108X271484