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

ABSTRACT

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

Acknowledgements

The authors sincerely thank Rio Tinto Metal Powders (Suzhou) Ltd. for providing the Q61 powders.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [Grant number 51871178].