The Paton Welding Journal, 2014, №02



2014 №02 (02)

DOI of Article 10.15407/tpwj2014.02.03

2014 №02 (04)

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The Paton Welding Journal, 2014, #2, 24-30 pages

LASER AND LASER-MICROPLASMA ALLOYING OF SURFACE OF 38KhN3MFA STEEL SPECIMENS

V.D. SHELYAGIN, L.I. MARKASHOVA, V.Yu. KHASKIN, A.V. BERNATSKY and O.S. KUSHNARYOVA

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
Considered are the technologies of laser and laser-microplasma alloying of surface layers of 38KhN3MFA structural steel specimens with introduction of powder filler materials based on tungsten and chromium carbide, promoting increase of physical-chemical properties of the parts, manufactured from these steels. Structural transformations, concentration variations and reasons of crack formation in treated surface layers were investigated at different modes of alloying using the methods of light microscopy and analytic scanning electron microscopy. It is shown that susceptibility to crack formation in laser and laser-microplasma alloying of specimens of 38KhN3MFA steel is caused, first of all, by structural (size of crystalline particles, coefficient of their shape) and concentration variations, related with redistribution of the elements, in particular, chromium, that results in formation of grain boundary concentration gradients. Absence of microcracks in a fusion zone at laser-microplasma method of alloying allows making a conclusion about perspective of application of this method for surface treatment of parts, manufactured from 38KhN3MFA steel. 6 Ref., 9 Figures.
 
 
Keywords: structural steel, treated surfaces, laser alloying, structure
 
 
Received:                30.09.13
Published:               28.02.14
 
 
References
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