Cause analysis of surface grinding crack of ASSAB718 die steel
Cause of surface grinding cracking of ASSAB718 die steel was examined by scanning electron microscopy fracture examination and optical microscope.The results show that the forging process of the die was not standardized and resulting in large deformation network structure, which significantly increased the quenching distortion of the parts.In order to correct the quenching distortion, the die surface was heated by two times at very high temperature, which was even higher than the melting temperature of the die material, resulting in cast dendrite microstructure at the die surface and burned microstructure in the subsurface layer, and the strength decreased sharply, the brittleness significantly increased.Finally, severe grinding cracks were produced when grinding the die surface.
ASSAB718 die steelgrinding crackdendrite structureburned tissue
NETL
NSTL
万方数据
维普
