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Study on the controlling factors for the quenching crack sensitivity of ultra-strong automotive steel

  • Eun Hye Hwang
  • Jin Sung Park
  • Si On Kim
  • Hwang Goo Seong
  • Sung Jin KimEmail author
Metals & corrosion
  • 4 Downloads

Abstract

This study examined the controlling factors for the quenching crack sensitivity of ultra-strong martensitic steel with a tensile strength exceeding 1.8 GPa. Two factors, the content of carbon alloyed in the steel and the type of quenchant used in the quenching process, were evaluated in terms of the strain level and diffusible hydrogen concentration, which were measured by electron backscattered diffraction-kernel average misorientation and thermal desorption spectroscopy, respectively. This study demonstrated that specimens with a higher carbon content exhibited larger lattice distortion and a higher dislocation density during the quenching process and may be more susceptible to cracks propagating along the prior-γ grain boundaries. The decrease in quenching rate and diffusible hydrogen concentration can be effective technical strategies for improving the mechanical toughness and mitigating the quench cracking of ultra-strong steels with a tensile strength of 2.0 GPa.

Notes

Acknowledgements

This research was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1C1C1005007). In addition, this work was partly funded and conducted under the Competency Development Program for Industry Specialists of the Korean Ministry of Trade, Industry and Energy (MOTIE), operated by the Korea Institute for Advancement of Technology (KIAT) (No. P0002019, HRD Program for High Value-Added Metallic Materials Expert).

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Advanced Materials EngineeringSunchon National UniversityJungang-ro, SuncheonRepublic of Korea
  2. 2.POSCO Technical Research LaboratoriesKumho-dong, GwangyangRepublic of Korea

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