Sammendrag
The wear rate for six alloy series (Mn14, Mn20, Mn20Cr2.5, Mn25Cr2.5, Mn25Cr2.5Ti and Mn20Cr2.5Ti) with varying carbon content has been determined by two different wear tests, i.e. a conventional two body abrasive test and an impact wear test. Bending experiments were carried out in order to look at the correlation between ductility, wear rate and alloying elements. The wear rate has also been related to microstructural features observed by light and electron microscopy. The wear rate decreased with increasing carbon content for all series in the impact test. This was also the case for all series except series Mn20 in the abrasive test. For series Mn20, the abrasive wear rate increased with increasing carbon content. For the other series the abrasive wear rate was reduced much more than the impact wear rate with increasing carbon content. By adding 0.2wt% titanium to series Mn20Cr2.5 and Mn25Cr2.5, the abrasive wear rate decreased with respectively 50%(at 1.5wt% C) and 45%(at 1.6wt% C). Increased carbon content led to substantially decreased ductility and increased hardness.
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