考虑到马氏体加铁素体双相钢的组织分布及变形特征与短纤维复合材料的相似性,以剪切滞后分析法为基础,提出一种新的双相钢强度表达式: σ_(bDP)=(β/23~(1/2)+0.65)1/Kσ_(bM)V_M+σ_(bF)(1-V_M)在成分及组织各不相同的各种双相钢上所得的实验数据均与按上式计算的结果符合较好。文中讨论了铁素体向马氏体的载荷传递及马氏体强度利用率。
Starting from certain similarities in the structural distribution and the deformation behaviour between the martensite-ferrite dual phase steels and the composite materials reinforced by discontinuous short fibers, a new expression is proposed for the tensile strength of the steels on the basis of the shear lag analysis, i. e. σ_(bDP)=(β/3~(1/2)+0.65)1/Kσ_(bM)V_M+σ_(bF)(1-V_M) where σ_(bDP), σ_(bM) or σ_(bF) is the tensile strength of the steel, the martensite or the ferrite phases respectively, β is the aspect ratio of martensite islands, K is the strength ratio of martensite to ferrite strength, V_M is the volume fraction of martensite and then (1-V_M) is the volume fraction of ferrite. It is in good agreement after quite a few examinations on a variety of dual phase steels with different composition and structure. The load transfer from ferrite to martensite and the utility of strength of martensite have been also discussed.
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