Title: Preliminary search on iron alloys boriding by means of P.T.A.

Authors: B. Tesi, Al Molinari, P. Giordano Orsini, T. Bacci, G. Pradelli, C. Gianoglio

Addresses: Dipartimento di Ingegneria dei Materiali, Universith di Trento, Via di Mesiano 77,38050 Trento, Italy. ' Dipartimento di Ingegneria dei Materiali, Universith di Trento, Via di Mesiano 77,38050 Trento, Italy. ' Dipartimento di Ingegneria dei Materiali, Universith di Trento, Via di Mesiano 77,38050 Trento, Italy. ' Dipartimento di Meccanica e Tecnologie Industriali, Universith di Firenze, Via S. Marta 3, 50139 Firenze, Italy. ' Dipartimento di Meccanica e Tecnologie Industriali, Universith di Firenze, Via S. Marta 3, 50139 Firenze, Italy. ' Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abmzzi 24,10129 Torino, Italy

Abstract: Low carbon steel (AISI 1010) samples were submitted to the P.T.A. technique using a Fe-B powder (8=13.5% wt.). The coatings consist of FnB orthorombic boride crystals that, in the outermost part, are surrounded, at the grain boundary, by FeB tetragonal boride and that, in the inner part, are embedded in the Fe-B-C ternary eutectic (Fea-Fe₃B_xC_1-x-Fe₂B). The relative abundance of the eutectic increases in relation to the distance from the external surface. Microhardness measurements, taken throughout the coating depth, gave constant values (about 1,300 HV_0.1) similar to those characteristic of Fe₂B boride. Annealing treatments in inert gas at 1,273 K for different times (2÷24 h) showed no modification in the constituent phases and microhardness values.

Keywords: surface engineering; plasma spray transferred arc; boriding; iron borides; iron alloys; low carbon steel; annealing; microhardness.

DOI: 10.1504/IJMPT.1993.036544

International Journal of Materials and Product Technology, 1993 Vol.8 No.2/3/4, pp.332 - 339

Published online: 04 Nov 2010 *

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