ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.147

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.149

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.151

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

AbstractOrganised by the Surface Engineering Society (SES) and held at The Institute of Metals, this one day technical meeting reviewed quality control from both the certification/documentation and practical viewpoints.

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.166

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.179

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.180

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

AbstractNickel based and cobalt based hardfacing layers produced by laser and a variety of conventional welding and spraying processes have been compared. Parameters measured include dilution, distortion, microstructure, surface texture, wear resistance, and macro- and microhardness of the constituent phases. Laser processing was found to give the lowest variation in deposit thickness, together with a fusion bond of low dilution. The high cooling rates of laser deposits lead to finer structures, greater microhardness, and enhanced solid solubility (offering the opportunity of developing a new range of hardfacing alloys). Carbide and eutectic phases in the laser deposited layers were of constant composition, whereas the solid solution phase was the hardest obtained owing to the presence of higher concentrations of carbon and chromium. Abrasive wear tests in general showed improved properties with increasing carbide size, although the increased hardness of the laser layer solid solution phase was also of benefit. The cobalt based laser hardfaced layer showed the highest wear resistance.

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.185

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

AbstractAlloys of WC–Co (6-30 wt-%Co) and WC–Ni (6-15 wt-%Ni) were implanted with chromium, molybdenum, and titanium ions at fluences from 1×1021to 4×1021ions m-2. Their corrosion resistance was evaluated before and after implantation using accelerated electrochemical techniques in a 0.005M H2S04and a 0.001M NaCl + 0.05M Na2S04solution. In general, ion implantation tended to decrease the corrosion rate and improve the pitting resistance. The most promising results were obtained with molybdenum implantation, which increased the passive range and substantially raised the pitting potential.

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.194

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

AbstractThe cutting performance of surface deformed and undeformed work materials was compared by single edge experiments with a modified Charpy pendulum. The differences were investigated with respect to chip formation mechanisms, specific cutting and thrust forces, and finish of the cut surfaces. Austenitic stainless steel and quenched and tempered steel work materials were investigated. The test method resembles intermittent metal cutting operations such as sawing and milling by generating short cuts with small and varying cutting depths. The most important conclusions are as follows: (1) Surface deformation of the work material surface improves machinability by reducing the cutting and thrust forces. (2) This is mainly the result of a reduced contact length between the chip and the rake face of the edge. (3) Work materials with thick and heavily deformed surface layers, such as austenitic stainless steel, yield high thrust forces at the beginning of the cut. (4) In work materials where the disintegration of the builtup edge degrades the finish of the cut surface, deformation hardening can yield an improvement.

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.199

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

AbstractThe effects of a range of acidic and alkaline reagents on the electrodischarge machined (EDM) surface of AISI D6 tool steel have been investigated. The acidic reagents were found to attack mainly the underlying parent metal at the roots of fine fissures in the recast layer, causing severe localised pitting of the EDM surface. The alkaline reagents, however, reacted strongly with the recast layer, giving rise to an evenly pitted surface. The results indicate that the majority of the globule appendages produced by EDM are fused firmly on to the recast layer. They become an integral part of the surface and cannot be easily dislodged by chemical means.

ISSN:0267-0844    

DOI:10.1179/sur.1990.6.3.206

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor