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Laser Cladding and Heat Treatment of Ni-Co-Mo Maraging Steel

Bergant ZoranSlabe Janez MarkoOcaña Jose LuisGrum Janez

出版	ASTM International, 2011
URL	http://books.google.com.hk/books?id=Uet3zgEACAAJ&hl=&source=gbs_api

註釋The subject of this paper is a surface-integrity analysis of Ni-Co-Mo laser cladded maraging steel (EN 10027-2, W. No. 1.2799). Experiments were performed on 3.3 kW Nd:YAG laser system with coaxial injection of Ni-Co-Mo powder alloy that integrates various modes of laser beam guidance and different degrees of overlapping. The specimens were subsequently solution and precipitation annealed in order to examine a precipitation hardening of the newly formed material using the scanning electron microscopy (SEM) with a microprobe for energy-dispersive spectroscopy analysis, supported by microhardness tests. The residual stresses were determined by a hole-drilling method, using the integral method for residual stresses calculation. Favourable compressive residual stresses are generated in laser cladded layers due to a phase transformation from austenite to lath-martensite. The optimal selection of laser cladding process parameters enables efficient and cost-effective maintenance of damaged surfaces on the vital parts of die-casting tools, made from 1.2799 maraging steel.