By using a reformed laboratory rolling mill,hot wear test under near service conditions has been carried out to examine the wear mechanisms of high chromium iron roll.Each time after being rolled up to a given cycle,t...By using a reformed laboratory rolling mill,hot wear test under near service conditions has been carried out to examine the wear mechanisms of high chromium iron roll.Each time after being rolled up to a given cycle,the worn morphology of roll surface was examined under SEM and occasionally by AES.Based on rolling conditions and lasting of in-service time,various wear characteristics have been identified distinctly.It involves abrasive wear and oxidation wear for matrix phase,fatigue wear,polishing wear and grain pull-out wear for carbides,smear adhesive wear,chemical wear,and in extreme case,plasticity-dominated wear.At the same time,wear type is also discussed compatibly in terms of abrasive wear,fatigue wear,as well as chemical wear according to conventional classification.And only in an extreme situation,i.e.rolling without cooling water,adhesive wear may partially be involved.At anytime under specified conditions,there are always several wear mechanisms occurring simultaneously,but usually only one of them can be identified as the dominant mode.And finally a wear mechanism figure can be depicted to qualitatively describe the relationship among them.展开更多
Cutting and wear properties of the TiC based cermets cutter with nano TiN addition were discussed in order to provide a theoretical basis for the practical application of such cermets cutter. Wear surface and quantita...Cutting and wear properties of the TiC based cermets cutter with nano TiN addition were discussed in order to provide a theoretical basis for the practical application of such cermets cutter. Wear surface and quantitative analysis of chemical composition were conducted using SEM and EDX. The results reveal that this kind of cermets cutter shows higher endurance than the conventional cermets cutter and cemented carbides cutter (YT15). Normal wear occurs under the condition of lower cutting parameters, and tipping will be the predominant failure mode when the parameters are higher. SEM analysis shows that the grain wear, oxidation wear and diffusion wear all exist. In addition, oxidation and diffusion become very obvious when the cutting parameters are large.展开更多
文摘By using a reformed laboratory rolling mill,hot wear test under near service conditions has been carried out to examine the wear mechanisms of high chromium iron roll.Each time after being rolled up to a given cycle,the worn morphology of roll surface was examined under SEM and occasionally by AES.Based on rolling conditions and lasting of in-service time,various wear characteristics have been identified distinctly.It involves abrasive wear and oxidation wear for matrix phase,fatigue wear,polishing wear and grain pull-out wear for carbides,smear adhesive wear,chemical wear,and in extreme case,plasticity-dominated wear.At the same time,wear type is also discussed compatibly in terms of abrasive wear,fatigue wear,as well as chemical wear according to conventional classification.And only in an extreme situation,i.e.rolling without cooling water,adhesive wear may partially be involved.At anytime under specified conditions,there are always several wear mechanisms occurring simultaneously,but usually only one of them can be identified as the dominant mode.And finally a wear mechanism figure can be depicted to qualitatively describe the relationship among them.
文摘Cutting and wear properties of the TiC based cermets cutter with nano TiN addition were discussed in order to provide a theoretical basis for the practical application of such cermets cutter. Wear surface and quantitative analysis of chemical composition were conducted using SEM and EDX. The results reveal that this kind of cermets cutter shows higher endurance than the conventional cermets cutter and cemented carbides cutter (YT15). Normal wear occurs under the condition of lower cutting parameters, and tipping will be the predominant failure mode when the parameters are higher. SEM analysis shows that the grain wear, oxidation wear and diffusion wear all exist. In addition, oxidation and diffusion become very obvious when the cutting parameters are large.
