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Influence of laser heat treatment on metal coating layers

A. OLÁH1,* , M. H. TIEREAN1,* , B. VERŐ2, C. MUNTEANU3, A. BARBINTA3

Affiliation

  1. Transilvania University of Brasov, Romania
  2. Bay Zoltán Institute for Materials Science and Technology Budapest, Hungary
  3. Gheorghe Asachi Technical University Iasi, Romania

Abstract

The paper presents a research concerning the influence of laser heat treatment on welded coating layers. The research was made with four types of electrodes for welding coating. Evaluation of results was made by researching the microhardness, wear resistance, SEM and EDS. Results reveal a good effect of laser heat treatment in case of coating with electrodes having low carbon and moderate chrome content. Usually, the hardness obtained after coating depends only on the filler material characteristics. The goal of this research is to demonstrate the increasing of hardness after the laser heat treatment of the welded coating layer. The welding coating process enables the recovery by means of reworking of some parts or machine components that reached the wear limit. In this situation, some examples are: dies, crankshafts, different machinery axles, camshaft which can be brought back to the nominal quota. After the analysis of the laser-hardened and remelted shaft under different power conditions, the conclusion was that the laser beam heating produces two kinds of regions inside the laser tracks. One region is composed predominately of martensite; the other region consists of unchanged proeutectoid ferrite, martensite and some pearlite..

Keywords

Metal coating, Laser beam, Hardness, Microstructure.

Submitted at: Feb. 7, 2013
Accepted at: Feb. 20, 2013

Citation

A. OLÁH, M. H. TIEREAN, B. VERŐ, C. MUNTEANU, A. BARBINTA, Influence of laser heat treatment on metal coating layers, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 1-2, pp. 114-120 (2013)