材料期刊网

本文从马氏体相变的K-S模型出发,求得了片状马氏体内外的相变应力场,确定了片内的塑性应变和真实应力、解释了亚结构的形成,随之导出了马氏体的屈服切变强度τs与亚结构n/N之间的函数关系 τ_S=G/A'[1/2(ε_(11)~*-ε_(22)~*+(2+β_0~2)~(1/2)(cos43.5°/U+cos34.5°sin9°/V)) 由求得的应力和应力强度因子,说明淬火开裂是完全可能的。

Based on the K-S model of the martensitic transformation, the stress field inside and outside the martensitic plate is obtained, the plastic strain and the true stress within the martensitic plate are determined and the formation of the martensitic substructure is discussed, therefore, the relationship between the yield shear strength, τ_s, and the substructure parameter, n/N, of martensitic plate may be deduced as: τ_s=G/A′[1/2(ε_(11)~*-ε_(22)~*)+(2+β_0~2)~(1/2)(cos43.5°/U+cos34.5°sin9°/V)] According to the stress and stress intensity factor resulted, the transformation cracking by quenching is quite possible.