Prevention and elimination of forging cracks (2)

Ultrasonic testing showed that the existence of cracks and pore defect of large forgings is an important cause of waste, most of which is due to internal blank there are loose, coarse grained inclusions, and cracks. They are due to the local inhomogeneous deformation, under great stress concentration and shear stress, which leads to the closure, compaction and the generation of deformation damage. Therefore, smelting of refractory raw materials, hot forging comprehensive control, cracks and eliminate the cause and condition is the effective measures to improve forging quality. However, for large forgings with inner crack defects have the healing repair, reopening to prevent scrap also has important economic significance.

The principleof crack repair: any structure and composition of heterogeneous refractory materials (including micro cracks), in the permit conditions, will tend to homogenization. Its essence is in force (diffusion concentration, electric field, stress field gradient) under the effect of diffusion and migration of metal atoms, the orientation of inner crack healing.

Now the application of high temperature diffusion treatment, pressure diffusion, diffusion and plastic deformation of the combination of healing methods. It have get obvious effect in the large tube plate, large module inclusion crack repair achieved remarkable results, and in the rolling steel tube, crack control.
The crack initiation and propagation in the forging process can be prevented and eliminated by using the internal crack repair mechanism effectively by means of the study and test method of hot forging crack, and combined with the microstructure and thermodynamic analysis of the forging cracks.
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Article Source:Prevention and elimination of forging cracks (2)
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