Abstract
The generation of defects, such as large-sized brittle phases and cracks, remains challenging due to the high carbon diffusion during repairing cast iron. To resolve this problem, a new austenitic Fe-14Ni-19Cr material was designed to repair QT500-7 by laser cladding under N 2 protective atmosphere. The results show that the defect formation was effectively suppressed, and a low-content carbon (∼0.18 %) was diffused from QT500-7 substrate into the laser-repaired layer. The microhardness increased steadily from the substrate of ∼200 HV 0.2 to the laser-repaired layer of ∼257 HV 0.2 . The laser-repaired specimen exhibits mechanical properties with ultimate tensile strength of 490 MPa, yield strength of 401 MPa and elongation of 7.7 %, which is equivalent to the QT500-7 substrate. This study will be potential in repairing high-carbon cast iron offering high performance at low cost.
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