Strength of Materials

, Volume 50, Issue 1, pp 146–150 | Cite as

Fracture Characteristics of B1500HS Steel Hot Blank Parts

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Warm and hot blanking processes were developed for solving problems in piercing and trimming of press-hardened parts, some fine blank parts with comprehensive mechanical properties could be produced by hot blanking. To establish the optimum blanking processes and evaluate the effect of blanking temperature on the sheared section surface and fracture direction. Along with the fracture mechanism and microstructure of the parts, a series of hot blanking experiments for B1500HS steels were carried out at different blanking temperatures (450–800°C) and an 8% die clearance. The experimental results show that with the blanking temperature, the smooth (burnish) zone width increases, and the fracture direction becomes nearly normal. The sheared section surface of the parts mainly demonstrates ductile fracture mainly, accompanied by local brittle fracture over the blanking temperature range of 450–600°C. A ductile fracture region contains a great amount of fine equiaxed dimples over the blanking temperature range of 650–800°C, their microstructure is of complete martensite.

Keywords

hot blanking sheared section fracture microstructure boron steel 

Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (51575324, 51175302), and the Science and Technology Development Program of Shandong (2014GGX103024).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Materials Science & EngineeringShandong University of Science & TechnologyQingdaoChina

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