ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.1

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.3

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.6

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.18

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.25

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractNitrocarburising is outstanding for the profusion of proprietary names and claims it has attracted during its 40 year existence. It can be characterised as a low distortion treatment for ferrous materials where surface enrichment, predominantly by nitrogen, forms a hard surface layer ofεiron nitride, beneath which there is a nitrogen diffusion zone. The surface layer imparts wear and corrosion resistance and the diffusion zone increases the yield and fatigue strength, particularly in thin sections. Process developments have significantly enhanced the corrosion resistance and aesthetic appearance of treated components to make nitrocarburising competitive with electroplated finishes. Major commercialisation took place duringthe 1980s, and examples are given of a wide range of successful applications from wheel bearings to bumper armatures, which use combinations of the properties obtainable from the process to provide cost and weight savings. Advances in equipment and process materials offer a treatment which greatly reduces environmental pollution.

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.29

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe industrial benefits of plasma nitriding and nitrocarburising over conventional processes are reviewed with particular emphasis on environmental benefits. The cost savings and improved quality control obtainable using plasma nitriding are demonstrated with examples drawn mainly from the automotive sector, including gears and injection nozzles; comparisons between different processing conditions are also drawn. Industrial applications of plasma carburising are given and discussed.

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.45

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe substrate plays an important role in the application of surface engineering processes. It provides mechanical support for the surface layer in components and may also interact with a surface layer during processing. The term‘subsurface engineering’has been coined to describe the deliberate selection or alteration of substrates to satisfy engineering and processing requirements economically.’Passive’subsurface engineering describes the conscious selection of a core material and its initial constitution to match it to a proposed surface engineering process. The materials engineering involved in selecting core materials for traditional thermochemical processes is well established. This is not generally so for new processes, or when older processes are applied to other types of substrate, as is illustrated with respect to the plasma nitriding of SG cast iron.‘Active’subsurface engineering entails the production of an intermediate layer on the core material. Often, the materials engineering requires account to be taken of the interaction of this subsurface layer with the surface layer created during processing, and this is illustrated by reference to some experiments on the CVD production of a TiC coating on a precarburised steel. Some mechanical requirements of a subsurface layer are illustrated by reference to the stress systems present in bending, in rolling contact, and in gears.

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.53

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe results of a practical investigation into the potential assessment of spraying and welding processes for the hardfacing of grey cast iron to resist abrasive wear are reported. The choice of alloy, processes, operating techniques, and testing procedures are discussed.

ISSN:0267-0844    

DOI:10.1179/sur.1991.7.1.61

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor