| Sliding wear of a nitriding steel against heat-resisting alloys, Incoloy 901 and 12%Cr steel, is investigated. Armsler-type wear tests are carried out at 540℃ under dry-air condition. Weight change during wear tests is measured by intermittent balancing method and wear debris is examined by traditional metallographic techniques. Regardless of the composition and surface condition, the heat-resisting alloys adhere to the non-nitrided nitriding steel samples at the early stage of wear, leading to a weight gain of the samples. When the nitriding steel samples are nitrided, they undergo erosion from the early stage of wear tests, leading to a weight loss. In this case, the base materials under nitrided layer become exposed during wear tests to the heat-resisting alloys. Worn surfaces of the non-nitrided samples show a complex morphology following the formation of surface-adhered layer and its successive delamination. |
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