Surface modification of Ti-6Al-4V alloy using laser-assisted deposition of a Ti-Si compound

被引:45
作者
Alhammad, M. [1 ]
Esmaeili, S. [1 ]
Toyserkani, E. [1 ]
机构
[1] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Laser cladding; Ti alloy; Vickers hardness test; X-ray diffraction; Microstructure;
D O I
10.1016/j.surfcoat.2008.06.160
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Pre-placed laser cladding and a mixture of 80 wt.%Ti-20 wt.%Si powder are used to produce hard coatings, containing Ti5Si3, on Ti-6Al-4V alloy substrate. The experiments are performed at three different laser scanning speeds for which a pulsed Nd:YAG laser and no shield gas are used. Optical microscopy, SEM, EDS and XRD methods, as well as microhardness measurement are used to examine the microstructural characteristics and hardness of the coating and coating-substrate interface. Crack-free coatings with metallurgical bonding to the substrate are obtained using 0.6 mm initial powder thickness. The coatings demonstrate solidified microstructures containing major dendritic and cellular Ti5Si3 phase with interdendritic/intercellular mixtures containing alpha-Ti and Ti3Al phases. The results indicate that utilizing a higher scanning speed leads to a finer distribution of Ti5Si3 phase and a higher hardness of coating, while a lower laser scanning speed may provide better control of the process. The effect of the laser scanning speed on the mechanisms of atom migration during cladding is discussed. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:1 / 8
页数:8
相关论文
共 35 条
[1]   Structure and properties of Al-Nb alloys produced by laser surface alloying [J].
Almeida, A ;
Petrov, P ;
Nogueira, I ;
Vilar, R .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 303 (1-2) :273-280
[2]   Production of glassy metallic layers by laser surface treatment [J].
Audebert, F ;
Colaço, R ;
Vilar, R ;
Sirkin, H .
SCRIPTA MATERIALIA, 2003, 48 (03) :281-286
[3]  
Boampong D K, 2003, J Appl Biomater Biomech, V1, P164
[4]  
Boyer R., 1994, Materials Properties Handbook, V1st
[5]  
DUTTA SC, 1999, P IND GEOT C, V1, P123
[6]   LASER SURFACE ALLOYING OF TI-6AL-4V WITH SILICON FOR IMPROVED HARDNESS AND HIGH-TEMPERATURE OXIDATION RESISTANCE [J].
FASASI, AY ;
ROY, SK ;
GALERIE, A ;
PONS, M ;
CAILLET, M .
MATERIALS LETTERS, 1992, 13 (4-5) :204-211
[7]   Surface tension of molten silicon measured by microgravity oscillating drop method and improved sessile drop method [J].
Fujii, H ;
Matsumoto, T ;
Izutani, S ;
Kiguchi, S ;
Nogi, K .
ACTA MATERIALIA, 2006, 54 (05) :1221-1225
[8]  
Gilgien P, 1996, NATO ADV SCI I E-APP, V307, P77
[9]   Corrosion of metal orthopaedic implants [J].
Jacobs, JJ ;
Gilbert, JL ;
Urban, RM .
JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME, 1998, 80A (02) :268-282
[10]   CO2 and Nd:YAG laser cladding using Stellite 6 [J].
Jansson, A ;
Ion, JC ;
Kujanpää, V .
FIRST INTERNATIONAL SYMPOSIUM ON HIGH-POWER LASER MACROPROCESSING, 2003, 4831 :475-480