J. Phys. IV France 04 (1994) C4-89-C4-92
Austenitic stainless steels layers deposited by laser cladding on a mild steel : realization and characterizationF. FOUQUET1, P. SALLAMAND1, J.P. MILLET2, A. FRENK3 and J.D. WAGNIERE3
1 GEMPPM/CALFETMAT, INSA, 69621 Villeurbanne cedex, France
2 Physicochimie Industrielle, INSA, 69621 Villeurbanne cedex, France
3 CTML, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
The present work reports on 18-10 (AISI 304 grade) and 18-12-Mo (AISI 316 grade) stainless steel coatings produced by laser powder cladding technique. Clad layers of uniform thicknesses have been produced through partially overlapping single cladding tracks. The clad layers thus obtained show excellent adherence, few porosities and good chemical homogeneity. The microstructure is dendritic or most often cellular. The 304 clad layers are free of cracks and have a structure mainly austenitic with a certain amount of [MATH]. The 316 clad layers show always cracks and their structure is almost fully austenitic. Primary solidification of [MATH] phase seems thus favourable to prevent hot cracking of the austenitic stainless steels layers. The corrosion resistance of the crack-free 304 clad layers has been tested in various saline media. In every case, the coatings exhibit a very good uniform corrosion resistance.
© EDP Sciences 1994