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研究了2个级别双相钢HC590DP和HC780DP在小应变下的单轴拉伸性能和纯弯曲性能。结果表明:在产生塑性应变初始阶段,相同应变下HC780DP应力反而小于HC590DP,但通过某临界点后,HC780DP应力超过HC590DP。2种材料在0.02%的小应变时,弯曲强度均大于拉伸强度;且材料在弯曲过程中的应变强化硬化能力要高于单轴拉伸;相比冲压成形,HC590DP和HC780DP在弯曲变形加工过程中(如辊压、折弯成形)的材料变形抗力大,塑性加工硬化率高,回弹量大。
The uniaxial tensile properties and pure bending properties of two grades of duplex steel HC590DP and HC780DP under small strain were studied. The results show that in the initial stage of plastic strain generation, the stress of HC780DP under the same strain is less than that of HC590DP under the same strain, but the stress of HC780DP exceeds that of HC590DP after passing a critical point. The flexural strength of the two materials is greater than the tensile strength at 0.02% strain, and the strain hardening hardenability of the material during bending is higher than that of the uniaxial tensile strength. Compared with the stamping, the HC590DP and HC780DP are superior in flexural deformation During the process (such as rolling, bending forming) material deformation resistance, plastic processing hardening rate, rebound large.