Three-Point Bending Fracture Properties of Multilayer Metal Hot Forging Die Specimen

摘要

Multilayer metal hot forging dies deposited by the plasma transferred arc welding presents high wear resistance, oxidation resistance and high temperature stability. In the process of hot forging, bending load made the cavity of multilayer metal hot forging die easily failure. We investigated the bending performance of multilayer metal hot forging die by three-point bending test. The model of bending specimen used H13 as the substrate, transition layer was W6Mo5Cr4V2 and outer layer was Ni60A. Mechanical properties of H13 homogeneous specimens and multilayer metal specimens were tested and compared. ABAQUS finite element method was used to simulate the process of three-point bending under temperature gradient. The results show that crack appears firstly in the H13 substrate and Ni60A layer, expands and meets in the transition layer gradually, results in specimen fractures. At service temperature, bending performance of the multilayer metal specimens is better than homogeneous specimens.