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It should be emphasized that the heat treatment crack is the same as that of the heat treatment process. It is now clear that like any fracture process, crack initiation they contain (or pre-existing microcracks, non-metallic inclusions, cast dendrite, cast iron graphite) and the crack growth process, is due to the different heat treatment crack in crack under internal stress generated by the crack development to a certain extent is caused by fracture, or form a development of cracks on the workpiece. According to the degree of crack propagation, heat treatment crack is divided into two cases. The first is that the crack size reaches the critical crack length, the crack will expand and become unstable.