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Abstract：
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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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Funds：
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国家重点研发计划项目（2017YFB0304400）
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AuthorIntro：
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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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Reference：
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