Dislocation sealer crack formation

Source:   Date:2014-10-28 15:46:34   Views:

By dislocation pileup theory we can know, when sealer dislocation slip plane rotation group by the resistance and accumulation, it will produce a lot of stress concentration (Fig. 2 a 15) a Zener and Stroh believes that when the stress near large enough atom atom is destroyed and the formation of cracks. Calculate the maximum stress Ol two occurred in 0 twenty-one 70.5 "Department, and include:
Smith theory that the crack is encountered due to dislocation movement hinder the formation of carbides. It is assumed that the grain boundary has a low carbon steel having a thickness of c. Carbides, stress dislocation pileup in the area tends to concentrate the stress gradually increased, which can make up to a certain extent carbide cracking to form cracks. Crack length is disposed co, according to Griffith formula, the critical tensile stress at this time is:
Show coarsening of grain boundary carbides, the steel is easy to cleavage fracture. Because with the grain boundary carbide coarsening of crack length c. Increases, the corresponding critical tensile stress. Reduced, so the material is easy to cleavage fracture. This has been confirmed in the experiment.