Microstructure and wear properties of Fe–15Cr–2.5Ti–2C–xBwt.% hardfacing alloys

• Published in: Applied surface science Vol. 271; pp. 253 - 259
• Main Authors: Liu, Dashuang, Liu, Renpei, Wei, Yanhong, Ma, Yan, Zhu, Kun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2013
• Subjects: Boron; Carbon volume fraction; Hard facing; Iron base; Wear resistance; Carbon volume fraction; Boron; Iron base; Wear resistance; Hard facing
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2013.01.169

► We fabricate Fe–15Cr–2.5Ti–2Cwt.% self-shielded metal cored hardfacing alloys with different boron additions. ► As the boron content exceeds 0.99wt.%, the hardfacing alloy possesses excellent wear resistance. ► With the addition of boron, the average carbide diameter and the carbide volume fraction both increase. In this investigation an attempt was made to study the effect of boron on microstructure and wear properties of hardfacing alloys. A new type of Fe–Cr–Ti–C self-shielded metal cored wire with varying boron content were developed to fabricate the hardfacing alloys by self-shielded metal cored arc welding. Phase composition and microstructure of the as-prepared alloys were characterized by X-ray diffraction and scanning electron microscopy. Wear behavior was investigated using a ring-on-block tester. The results showed that the average diameter of M7(C, B)3 (M=Cr, Fe mainly) carbide increases from 9 to 20μm and carbide volume fraction (CVF) increases from 14.10 to 36.00% with the boron increasing from 0 to 1.4wt.% in the alloy. The hardness increases rapidly as boron content increases up to 0.99wt.%, and then increases more slowly. Boron improves the wear resistance of the alloys. As the boron content exceeds 0.99wt.%, the Fe–15Cr–2.5Ti–2C hardfacing alloy possesses excellent wear resistance.