Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 6, Pages 1062-1068Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.07.064
Keywords
Tribology; Carbide degradation; Ni-based; Hardfacing; Abrasion; Impact
Funding
- Austrian Research Promotion Agency (FFG)
- TecNet Capital GmbH (Province of Niederosterreich)
- Austrian Center of Competence for Tribology (AC2T research GmbH)
- Busatis GmbH
- Castolin Ges.m.b.H.
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Within this work, the effect of carbide degradation in a WC/W2C reinforced Ni-based hardfacing was assessed under abrasive and combined impact/abrasive conditions. In view of the above, a WC/W2C reinforced Ni-based hardfacing was deposited by plasma transferred arc (PTA) welding using different welding currents. Microstructure was characterised by quantitative metallography to determine specific structural parameters: mean carbide diameter and carbide area fraction. Scanning electron microscopy (SEM, EDS) and X-ray diffraction (XRD) were also used to characterise carbide dissolution mechanism. Tribological behaviour was determined with a 3-body abrasion test according to ASTM G65 and with a cyclic impact/abrasion test (CIAT). Results showed significant carbide degradation with increasing welding current, resulting in a significant reduced primary carbide content and carbide diameter. Reduced carbide content indicated a significantly wear rate increase under pure 3-body abrasion conditions. Specific wear energy was determined under pure abrasive condition and showed significant dependence on the primary carbide content. However, wear rates under combined impact/abrasion were at constant level due to the reduction of the brittle primary carbide content. (C) 2011 Elsevier B.V. All rights reserved.
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