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摘要：
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为分析双相钢的变形与断裂行为、评估其成形性能，以典型双相钢DP780和DP600为研究对象，采用实验与计算方法得到了两种双相钢材料的成形极限曲线和断裂极限曲线，通过观测不同应变路径状态下试样的断裂形态，分析材料成形极限与断裂极限曲线，并与传统低合金高强钢比较，研究了双相钢材料不同应变路径下的变形特性。结果表明：随着应变路径状态由单向拉伸向双向拉伸变化，双相钢的断裂主应变逐渐降低，且在断裂前会有明显的颈缩阶段，而当应变路径为双向等拉状态时，材料在断裂前无颈缩特征出现，表现为脆性断裂，这与传统低合金高强钢不同，双相钢的这一特性应主要由双相钢的铁素体和马氏体软硬两相组织决定。
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In order to analyze the deformation and fracture behaviors of dual phase steel and further evaluate its formability, for two typical dual phase steels of DP780 and DP600, the forming limit curve and fracture limit curve of two dual phase steels of DP780 and DP600 were obtained by experiments and calculation methods and analyzed by observing the fracture morphology of samples under different strain path states, and the deformation characteristics of dual plase steel under different strain paths were studied comparing with that of the traditional low-alloy high-strength steel. The result shows that when the strain path changes from uni-axial tensile to biaxial tensile, the fracture principal strain of dual phase steel gradually decreases, and there is an obvious necking stage before fracture. However, when the strain path is biaxial iso-tensile, the material does not shrink before fracture, and it appears as brittle fracture, which is different from that of the traditional low-alloy high-strength steel, and this characteristic of dual phase steel is mainly determined by the soft phase ferrite and the hard phase martensite.
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基金项目：
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国家重点研发计划项目（2017YFB0304400）
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作者简介：
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作者简介：潘利波（1979-），男，工学博士，副教授，E-mail：pan97181@126.com
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参考文献：
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