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论文类型：期刊论文

发表时间：2013-08-15

发表刊物：8th Asian-European International Conference on Plasma Surface Engineering (AEPSE)

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：228

期号：SUPPL.1

页面范围：S452-S455

ISSN号：0257-8972

关键字：Coaxial laser cladding; Ti alloy; Al2O3-13wt. %TiO2; Microstructure; Electron microprobe

摘要：Spray-dried sintered Al2O3-13wt. %TiO2 powders were directly coated on Ti-6Al-4 V alloy by coaxial laser cladding. The microstructure, elements distribution and phase analysis of the cladding sample were studied by optical microscopy, EPMA, SEM and XRD methods. The results indicated that the coatings with fine metallurgical bonding to the substrate comprised major stable alpha-Al2O3 and demonstrated three different regions of solidification microstructures. One region, at the bottom of the molten pool, contained mainly Ti enrichment columnar grains and randomly scattered ceramic particles, named Transition Zone. The second region, within the 0.1 mm scope above the transition zone, contained mainly fine equiaxed Al2O3 grains. The third region, at the upper zone of the molten pool, showed coarse equiaxed and cellular Al2O3 grains with obvious segregation of Ti and V elements. The mechanisms of microstructure formation, elements migration and segregation in the experiment were discussed. (C) 2012 Elsevier B.V. All rights reserved.