A Study on the Structures and Properties of B-Bearing Cast Steel for Wear Resistance

Abstract:

The microstructures of B-bearing cast 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 characterized by means of optical OM, SEM, EPMA and XRD. 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 K-1273 K. The hardness and impact toughness of the B-steel exceed 55 HRC and 150 kJ/m2, respectively. 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.

• Periodical: Applied Mechanics and Materials (Volumes 34-35)
• Pages: 878-882
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.34-35.878
• Online since: October 2010
• Authors: Zhi Qiang Jiang, Xi Lan Feng, Xian Zhang Feng
• Keywords: B-Bearing Cast Steel, Borides, Lath Martensite, Mechanical Property, Quenching, Solidification Microstructure

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