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Shear Fracture of Advanced High Strength Steels

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Abstract

Failure experiments were carried out through a stretch-bending test system for advanced high strength steels, i. e. dual-phase (DP) steels and martensitic steels (MS). The die radius in this system was designed from 1 to 15 mm to investigate the failure mode under different geometries. Two failure modes were observed during the experiments. As a result, critical relative radii (the ratio of inner bending radius R to sheet thickness t) for DP590 and DP780 steels were obtained. The stretch-bending tests of DP980 display some trends unlike DP590 and DP780 steels, and curve of DP980 in different thicknesses does not coincide well. High blank holder force exhibits more possibility of shear fracture tendency than low blank holder force. The unique character of high strength martensitic steel (1500MS) is that no shear fracture is found especially over small bending radius (R = 2 mm) under the same experimental conditions. Microstructure analysis indicates that there are obviously elongated grains on shear fracture surface. It shows smaller diameter and shallower depth of the dimples than the necking failure.

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Authors and Affiliations

  1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China

    Sheng Huang (Doctor Candidate) & Chun-feng He

  2. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yi-xi Zhao (Doctor, Associate Professor)

Authors
  1. Sheng Huang
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  2. Yi-xi Zhao
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  3. Chun-feng He
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Corresponding author

Correspondence to Yi-xi Zhao.

Additional information

Foundation Item: Item Sponsored by National Natural Science Foundation of China (51075267); International Cooperation Program in Science and Technology of MOST of China (2010DFA72760)

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Huang, S., Zhao, Yx. & He, Cf. Shear Fracture of Advanced High Strength Steels. J. Iron Steel Res. Int. 21, 938–944 (2014). https://doi.org/10.1016/S1006-706X(14)60165-5

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60165-5

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