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高温形变热处理提高钢的强度,其原因是形变奥氏体的亚结构遗传给马氏体,并且由于亚结构的阻碍作用细化了马氏体晶粒。如果高温形变热处理时再结晶过程不显著,除了位错(自由的和亚晶界的)密度增加外,尚可看到沿轧制方向的奥氏体晶粒拉长,沿轧制面的奥氏体晶粒压扁。当原始奥氏体晶粒细化时,钢的屈服强度(σ_(0.2))可用Peteh-Hall公式表示:
High-temperature deformation heat treatment increases the strength of the steel because the substructure of the deformed austenite is inherited to the martensite and the martensite grains are refined due to the obstruction of the sub-structure. If the recrystallization process is not significant at the high temperature deformation heat treatment, in addition to the increased density of dislocations (free and subgrain boundaries), the austenite grains along the rolling direction can be seen elongated, The grain of the body is flattened. When the original austenite grain refinement, the yield strength of steel (σ_ (0.2)) can be expressed by Peteh-Hall formula: