Important features of elevated temperature abrasive wear

5 Important features of elevated temperature abrasive wear 

As mentioned earlier, work on high temperature abrasive wear of metallic materials has been rather limited. Only a few studies in this area have been published [74-88], Based on these studies, the following features can be 

The variation of relative abrasive wear resistance (RAWR) as a function of temperature for ductile iron is presented in Fig. 6.14a [74], It is clear that the abrasive wear resistance shows a maximum at around 323-373 K. The RAWR is 20% lower at higher temperature than at ambient temperature. The high value of the RAWR at around 323-373 K is attributed to dynamic strain ageing. In contrast, the decrease of RAWR with increase of temperature is related to loss of strength and ductility of the ductile iron at high temperature. 

The abrasive wear resistance of Ni based alloy and of Ni based alloy reinforced with WCAV2C as a function of temperature is shown in Fig. 6.14b [75], This figure compares wear resistance in argon and in air. In argon above 773 K the abrasive (flint) becomes soft and an increase in wear resistance is noted. However, when the abrasive remains hard as in the case of SiC, the wear resistance decreases with increase of temperature, hi air, WC and W2C get oxidized and in the process become harder, thus wear resistance in air decreases with increase of temperature. This effect is not very significant in the argon atmosphere. 

3 Two-body and three-body abrasion at elevated temperature 

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