新年新气象，良好的开端，继续努力！ 

Investigation on the hot-deformation behaviour of sintered and forged specimens to improve the forging safety of powder-forged products

S. Wang, Y.K Wu, H.L Wang, F. Jiang*

State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

*Corresponding author: jiangfeng@mail.xjtu.edu.cn (F. Jiang)

To improve the forging safety of powder-forged products, the hot-deformation behaviour of sintered and forged alloys was investigated and compared in the present study. The results show that the forged specimen was at a higher risk of cracking than the sintered specimen during the forming process. Furthermore, the finite-element simulation also clearly revealed that both fully dense and not fully dense regions co-existed during the forming process. Therefore, using the processing map of the forged specimen to determine the forging parameters would improve the forging safety of powder-forged products. Finally, a spur gear was manufactured as a model product based on the simulated results.

Keywords: Powder forging; Hot-processing map; Constitutive equation; Microstructure; Finite-element method