ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.89

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.91

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.94

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.115

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.119

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.120

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

摘要:

AbstractThe metal vapour vacuum arc ion source is introduced and its more important features and system characteristics are described. Specific reference is made to applications in the field of metallurgical surface treatment by metal ion implantation and some recent developments are reviewed. The effects of aluminium ion implantation (doses up to 1·3×1017 ions/cm2) onthe sliding wear properties of Ti-6Al-4 V forms the emphasis of the ensuing investigation. Damage induced in sliding wear tests was reduced by about 50% after aluminium implantation, owing to a higher surface hardness. Several techniques of surface analysis including glancing angle X-ray diffraction and glow discharge optical emission spectroscopy indicated that subsurface precipitates were primarily responsible for the observed wear mechanism. The strengthening of subsurface material delayed the onset of superficial plastic deformation and resulted in enhanced tribological properties.

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.123

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

摘要:

AbstractLaser shock surface treatment is a recently developed process designed to improve component fatigue life in a manner similar to conventional treatments such as shot peening. Irradiation with a short, intense laser pulse can be used to induce plastic strains and compressive residual stresses in metallic substrates. At laser energy densities above the threshold for melting and evaporation a hot plasma can form, expansion of which will induce a shock wave in the substrate, creating plastic strains. The effect of laser induced stress waves on residual stress, micro hardness, and surface quality of a standard steel have been investigated.

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.131

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

摘要:

AbstractThe wear of TiN coatings in dry rolling contact with a non-uniform Hertzian stress distribution has been studied. Wear behaviour was observed in situ and the mechanisms of damage were examined by optical and electron microscopy and laser profiling. Changes of friction coefficient, weight, residual stress, percentage of undamaged TiN, and surface roughness were also observed. The failure mechanism of TiN coated SAE 52100 steel running against steel rollers was dominated by microcracking, transfer of material, and fatigue; that of TiN against TiN (both on M2 tool steel substrates) was principally adhesive failure, which occurred at the near surface carbides in the steel. Tests involving TiN coated rollers running against TiN coated rollers lasted 39 800 rolling contact cycles, whereas TiN versus steel failed after 8600 cycles and steel versus steel after less than 1700 cycles.

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.133

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor

摘要:

AbstractTotal hip replacement (THR) surgery is currently a common and successful procedure, but THR implants sometimes fail because of aseptic loosening after relatively short periods of time. Observations from retrieved femoral and acetabular TH R components have shown that scoring of both bearing surfaces occurs; scoring of the metallic femoral head components is a result of abrasion by bone cement debris embedded in the ultrahigh molecular weight polyethylene (UHMWPE) acetabular cups. To reduce wear of these bearing surfaces the feasibility of applying titanium nitride (TiN) coatings to Ti–6Al–4 V femoral heads is being investigated. In vitro wear tests of TiN coated Ti–6Al–4V against UHMWPE and TiN coated Ti–6Al–4 V have been performed using a pin on disc wear testing device. Early results showed that the wear is different for each wear couple. The UHMWPE has been found to wear initially by removal of residual machining marks and then by removal of thin layers of polymer. Pins consisting of TiN coated Ti–6Al–4V run against UHMWPE discs had a thin polymer transfer film and were lightly scored. Untreated Ti–6Al–4 V pins under the same conditions also had a thin polymer transfer film, but were scored more severely and caused slightly more polymer wear than the TiN coated pins. When TiN coated Ti–6Al–4 V pins were tested against TiN coated Ti–6Al–4 V discs the character of wear differed. The predominant wear mechanism involved oxidation.

ISSN:0267-0844    

DOI:10.1179/sur.1995.11.2.138

出版商:Taylor&Francis    

年代:1995

数据来源: Taylor