The effects of additive elements on the microstructure characteristics and mechanical properties of Cr-Fe-C hard-facing alloys

Abstract

The present investigation discusses the effects of V, Mo, and Ni addition on the morphologies and mechanical properties of primary carbides and eutectic colonies in Cr-Fe-C hard-facing alloys with hypereutectic compositions. Findings show that V, Mo, and Ni addition obviously affects the hardness and indentation fracture (K(C)) of primary carbides and eutectic colonies. V addition to alloy A can slightly increase the hardness of primary carbides varying from 1503 +/- 17 to 1551 +/- 13 HV but slightly decreases the K(C) value of primary carbides ranging from 3.80 +/- 0.15 to 3.64 +/- 0.14 MPa m(1/2). Mo addition to alloy B can increase the K(C) value of primary carbides ranging from 2.35 +/- 0.11 to 2.67 +/- 0.08 MPa m(1/2). Ni addition to alloy B can decrease the hardness of eutectic colonies varying from 769 +/- 9 to 608 +/- 13 HV. Maximum hardness was obtained in the coated surface of alloy B due to the formation of large amounts of primary M(7)C(3) carbides. (C) 2010 Elsevier B.V. All rights reserved.