ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.1

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.3

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.6

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.18

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.29

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.32

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.36

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractThe abrasion properties of a series of hardfacing deposits of chromium carbide alloys and tungsten carbide composites have been examined using the laboratory pin test. Corrt;lation between the abrasion resistance and variation in microstructural parameters of the deposited layers was determined for both 120 j1m garnet and 80 j1m alumina abrasives. The effects of alloy hardness (Hv) and volume fraction of primary carbide (Vc) on abrasion characteristics are shown to depend in a critical manner on abrasive type.

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.41

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractThe results of a study on the combined nitrocarburising and laser beam hardening of 50Cr V4 steel are presented. A normalising or hardening and tempering pretreatment was applied before nitrocarburising for 4 or 8 h at 843 K. Surface and cross-sectional microstructure, layer morphology, concentration-depth profiles for carbon, nitrogen, and oxygen, and hardness-depth profiles are presented. A ttempts to correlate laser beam power, traverse speed, and degree of defocusing with the microstructures and hardness profiles obtained are described and the microstructural transformations occurring during laser treatment are discussed. Optimum hardening was obtained when the compound zone has either just or almost been transformed completely, when any porosity present has yet to coagulate to fornz larger cavities, when fine martensite coupled with retained austenite exists near to the surface, when fine, lathlike martensite is found in the diffusion layer, and when nitrogen and carbon are found at levels below those of the compound layer but higher than those of the diffusion layer, across a region wider than the original compound layer. Recommendations for transferring this combined hardening treatment to industrial practice are given.

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.45

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractA critical evaluation of the effect of ion implantation on wear, fatigue, and fretting fatigue of Ti-6AI-4V is presented for optimising the parameters towards a specific type of property improvement. The analysis presented is based on the extensive results available on the effect of N + or C + implantation on the wear behaviour of Ti-6AI-4 V. In order to obtain the maximum benefit from either of these species the implant conditions and post-implant processing must be such as to ensure second phase precipitation. However, this is not the case for fatigue which is predominantly in the elastic region where solid solution hardening appears to be a sufficient mechanism for increasing the fatigue strength via ion implantation. Improving the fretting fatigue strength via ion implantation is more likely to result from implanting with ions to reduce wear rather than fatigue. Because the mechanisms in unidirectional sliding wear and fretting wear are essentially the same in Ti-6AI-4 V, it appears that ions which improve unidirectional wear resistance should also improve fretting wear. However, variations may arise from the differences between the behaviour of surface oxide layers in unidirectional wear and fretting wear, respectively.

ISSN:0267-0844    

DOI:10.1179/sur.1989.5.1.55

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor