Selection of the optimal hard facing (HF) technology of damaged forging dies based on cooling time t_8/5

Abstract

In exploitation, the forging dies are exposed to heating up to very high temperatures, variable loads: compressive, impact and shear. In this paper, the reparatory hard facing of the damaged forging dies is considered. The objective was to establish the optimal reparatory technology based on cooling time t8/5 . The verification of the adopted technology was done by investigation of the hard faced layers microstructure and measurements of hardness within the welded layers’ characteristic zones. Cooling time was determined theoretically, numerically and experimentally.

Keywords

• Forging dies
• hard facing
• cooling time t_8/5
• hardness
• microstructure