Microstructure and wear of materials pdf

The average grain size of the WC crystals was determined ing systems. The SPS process has the laser power was W; traverse speed was 3. The oxygen concentration was controlled pressure. Thus, samples can be sintered at comparatively lower at less than 20 ppm. The bulk sample was made by the SPS process in a Dr. Sinter In the present study, the microstructure and tribological behav- system, supplied by Sumitomo Coal Mining Co.

The wear performance of these in Fig. It was then fast sintered at by SPS technique. Experimental procedure was 4. Finally, the bulk sample was naturally cooled down to room temperature. Temperature was controlled by a K-type had been sieved so that the resulting agglomerate size was con- thermocouple inserted into the graphite die. Each average value was calculated from 25 different was observed by means of a scanning electron microscope SEM measurements, and the anomalous values that result from material and energy-dispersive X-ray spectroscopy EDX SEM, Jeol JSM- defects were discarded.

Observations were carried out on the surfaces and on pol- ished cross-sections normal to the surface. The metallographic 3. The porosity 3. Microstructural characterization of the samples was evaluated by image analysis technique Leica Qwin using a Leica optical microscope.

The phase characterization The SEM micrographs of the feedstock powders are shown in of the as-received powder and the samples was conducted by XRD Fig. Co agglomerate Fig. The tests were carried out 1—2 lm. The The microhardness of the samples was measured by using a coating was very dense and presented a very good bonding to Duramin 5 microhardness tester Struers with a Vickers diamond the substrate.

A previous study on the adhesive strength of the indenter under a load of g. Fifteen data points were collected HVOF coating demonstrated values higher than 75 MPa measure- and averaged for each hardness value. The universal hardness ments were performed according to ASTM C standard HU and the elasto-plastic properties were determined by means [12]. The WC particles are distributed uniformly in the coating.

The measurements were per- The sharp irregular shapes of the WC particles indicate that these formed according to DIN by using a dynamic microhard- particles were not molten during spraying.

Values of ultra-microhardness [13]. When mined after removal of the applied load plastic hardness, Hplas. When the second layer is being the measured data. The elastic recovery of the coating was also deter- micron regimes.

However, the bottom portion of lus E was calculated. Images in the large frame show the morphology of the agglomerates and images in the small frame show the cross-section of the agglomerates. Compared with Table 1 Micro and ultra-microhardness test results mean values the feedstock powder, it is observed that the WC particles maintain their initial nano-size or submicron-size after SPS consolidation.

The presence of micro porosity ob- Universal hardness GPa 9. The porosity measurements calculated by image analysis tech- nique for the WC based coatings and bulk samples are given in Table 1. For the nanocrystalline verse section of the coatings in Fig. The answer is yes.

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Contact mechanics. Surface temperature. Classification of Wear Processes. Wear mechanism. Worn surfaces. Tribological testing. Grooving Wear. Sliding Wear. The progress of wear. Influence of surface roughness. Rolling-Sliding Wear of Metals. Operating conditions. Microstructure and properties of materials.