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Effects of annealing on interface microstructure and tensile fracture morphology of 42CrMo/Q235 cross wedge rolling (CWR) laminated shafts
; Faculty of mechanical engineering, Ningbo university, Ningbo, China
W. F. Peng ; Faculty of mechanical engineering, Ningbo university, Ningbo, China
X. D. Shu ; Faculty of mechanical engineering, Ningbo university, Ningbo, China
The laminated shafts were prepared by CWR process. The heat treatment study was carried out to enhance its properties. The shafts were treated by different annealing processes, the changes of properties before and after annealing were compared. The microstructure and the tensile fracture were analyzed. The results showed that the tensile and shear properties of the laminated shafts were the best when annealing at 700 °C for 60 min, which could reach 576 MPa and 473 MPa, respectively. After annealing, fine interfacial spheroidal structure could be obtained and enhanced the bonding strength; the dimple holes at the tensile fracture became larger and deeper, and the fracture became uniform and stable, clarified the reasons of the change of mechanical properties.
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