【摘 要】
：
According to the stress-strain curves of single-phase martensite and single-phase ferrite steels, whose compositions are similar to those of martensite and ferr
【机 构】
：
State Key Laboratory of Metastable Materials Science and Technology,State Key Laboratory for Advance
【基金项目】
：
河北省自然科学基金;the Program for One Hundred Excellent Talents of H
论文部分内容阅读
According to the stress-strain curves of single-phase martensite and single-phase ferrite steels, whose compositions are similar to those of martensite and ferrite in low Si-Mn-Nb dual-phase steel, the stress-strain curve of the low Si-Mn-Nb dual-phase steel was simulated using the finite element method (FEM). The simulated result was compared with the measured one and they fit closely with each other,which proves that the FE modelis correct. Based on the FE model, the microstress and microstrain of the dual-phase steel were analyzed Meanwhile, the effective factors such as the volume fraction of martensite and the yield stress ratio between martensite and ferrite phases on the stress-strain curves of the dual-phase steel were simulated, too. The simulated results indicate that for the low Si-Mn-Nb dual-phase steel,the maximum stress occurs in the martensite region, while the maximum strain occurs in the ferrite one. The effect of the volume fraction of martensite (f_M) and the yield stress ratio on the stress-strain curve of the dual-phase steel is small in the elastic part, while it is obvious in the plastic part. In the plastic part of this curve, the strain decreases with the increase of f_M, while it decreases with the decrease of the yield stress ratio.
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