Microstructure and sliding wear behaviour of Tribaloy T-800 coatings deposited by laser cladding

被引:95
作者
Navas, C
Cadenas, M
Cuetos, JM
de Damborenea, J
机构
[1] CSIC, CENIM, Dept Corros & Protecc, E-28040 Madrid, Spain
[2] Univ Oviedo, Area Ingn Mecan, Gijon 33203, Spain
关键词
Tribaloy T-800; laser cladding; microstructure; sliding wear;
D O I
10.1016/j.wear.2005.04.020
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This work has focused on the obtainment of Tribaloy T-800 coatings by laser cladding on plane 18/8 stainless steel specimens (AISI 304). The appropriate selection of cladding parameters allowed defect-free coatings to be obtained with minimal dilution. In order to evaluate their microstructure, cross-sections of the coatings were examined by optical microscopy and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The elemental composition of the coatings was determined using an optical emission spectrometer with an excitation source (GDOES) and phase analysis was performed by X-ray diffraction (XRD). Several zones can be distinguished in the microstructure of the clad layer: a planar crystallization region at the interface with the substrate, followed by cellular and dendrite crystallization from the interface to the surface of the laser track and an overlap zone between tracks which is characterised by the coarsening of the structure and the formation of a lamellar eutectic phase. The mechanical properties were evaluated by hardness measurements and sliding wear tests (ball-on-disk and block-on-ring configurations) at room temperature and without lubrication. It was observed the great hardness (close to 850 HV0.3) achieved for the Tribaloy 800 laser coatings, which presented a wear coefficient (k) between one and two orders of magnitude lower than the substrate. The analysis of the clad worn surfaces showed that there was a transition from an adhesive-oxidational mechanism to a more severe plastic deformation and crack formation wear process with increasing the applied load. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:838 / 846
页数:9
相关论文
共 23 条
[1]   On the wear characteristics of cobalt-based hardfacing layer after thermal fatigue and oxidation [J].
Aoh, JN ;
Chen, JC .
WEAR, 2001, 250 (PART 1) :611-620
[2]   CONTACT AND RUBBING OF FLAT SURFACES [J].
ARCHARD, JF .
JOURNAL OF APPLIED PHYSICS, 1953, 24 (08) :981-988
[3]  
BARRETT CS, 1985, METALS HDB, V9, P706
[4]  
Colaco R, 1994, HIGH TEMP CHEM PROC, P21
[5]  
Crook P., 1990, COBALT COBALT ALLOYS, V2, P446
[6]  
Czichos H., 1978, TRIBOLOGY
[7]   Microstructural features of consecutive layers of Stellite 6 deposited by laser cladding [J].
D'Oliveira, ASCM ;
da Silva, PSCP ;
Vilar, RMC .
SURFACE & COATINGS TECHNOLOGY, 2002, 153 (2-3) :203-209
[8]   Some aspects of laser surface cladding in the turbine industry [J].
Kathuria, YP .
SURFACE & COATINGS TECHNOLOGY, 2000, 132 (2-3) :262-269
[9]   Banded solidification microstructures [J].
Kurz, W ;
Trivedi, R .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1996, 27 (03) :625-634
[10]  
KURZ W, 1994, MAT SCI ENG A-STRUCT, V179, P49