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本文结果指出,T10A及GCr15两钢的单位体积内(225)_γ马氏体片数N_v与原始奥氏体晶粒平均直径D的关系为N_V=N_0(?)~(-1/2).用相变驱动力作用下的低温多晶范性形变的位错理论可推得此关系.据此认为(225)_γ马氏体形核是在相变驱动力作用下,开动位错源的结果.可见,没有预存的马氏体核胚,而只有预存的位错源.细化原始奥氏体晶粒是细化(225)_γ马氏体片的有效方法.
The results show that the relationship between the number of (225) _γ martensite N_v and the average grain size D of austenite in unit volume of T10A and GCr15 is N_V = N_0 ~ (-1/2). This relationship can be deduced from the dislocation theory of low-temperature polycrystalline normal deformation under the action of phase-change driving force, and it is considered that the (225) _γ martensite nucleation is the result of dislocation source driven by the phase change driving force It can be seen that there is no pre-stored martensite nuclei, but only the pre-stored source of dislocations.The refinement of primary austenite grains is an effective method to refine (225) _γ martensite.