摘要
对超高强双相钢DP1000进行单道次热模拟压缩实验,研究了其在950~1150℃和0.05~10 s~(-1)条件下的热变形行为,分析了变形温度和变形速率对流变应力的影响,建立了基于位错密度理论的热力学本构模型,确定了可表征微观硬化和软化机制的材料特征参数,量化了加工硬化、动态回复和动态再结晶对宏观力学行为的影响。结果表明:超高强双相钢DP1000的热变形应变速率ε?≤0.05 s~(-1)时以动态再结晶软化机制为主,应变速率ε?>0.1 s~(-1)时以动态回复软化机制为主,应变速率0.05 s~(-1)<ε?≤0.1 s~(-1)时由这两种软化机制共同作用。这个本构模型的预测值与实验值具有较高的一致性,能准确预测超高强双相钢DP1000在高温变形条件下的流变应力。
The compression deformation behavior of ultra-high strength dual phase steel(UHSDP1000) was investigated by strain rates from 0.05 s~(-1)to 10 s~(-1)at temperatures from 950°C to 1150°C.The influence of deformation temperature and strain rate on the hot flow curves was analyzed. Then a constitutive model for hot deformation of the steel UHS-DP1000 was established based on the dislocation density theory. The relevant softening mechanism of the steel was revealed in terms of the following two aspects that by low strain rates(lower than 0.05 s~(-1)) at high temperatures the dynamic recrystallization(DRX) softening mechanism was more evident, while by strain rates higher than 0.1 s~(-1)the dynamic recovery(DRV) softening mechanism was dominant. The two softening mechanisms worked simultaneously by strain rates in a range between 0.05 s~(-1)and 0.1 s~(-1). The stress-strain values predicted by thepresent model for the steel UHS-DP1000 are well agreed with those acquired from experiments, which further confirmed that the established constitutive model could give an accurate estimate for the flow stress of high temperature deformation of the steel UHS-DP1000.
引文
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