Study on the controlling factors for the quenching crack sensitivity of ultra-strong automotive steel
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...
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| Veröffentlicht in: | Journal of materials science 2020-03, Vol.55 (8), p.3605-3617 |
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| creator | Hwang, Eun Hye Park, Jin Sung Kim, Si On Seong, Hwang Goo Kim, Sung Jin |
| description | 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. |
| doi_str_mv | 10.1007/s10853-019-04177-1 |
| format | Article |
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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.</description><identifier>ISSN: 0022-2461</identifier><identifier>EISSN: 1573-4803</identifier><identifier>DOI: 10.1007/s10853-019-04177-1</identifier><language>eng</language><publisher>New York: Springer US</publisher><subject>Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Classical Mechanics ; Crack sensitivity ; Crystallography and Scattering Methods ; Grain boundaries ; Hydrogen ; Materials Science ; Mechanical properties ; Metals & Corrosion ; Polymer Sciences ; Solid Mechanics ; Steel ; Steel, Automobile ; Structural steels ; Tensile strength</subject><ispartof>Journal of materials science, 2020-03, Vol.55 (8), p.3605-3617</ispartof><rights>Springer Science+Business Media, LLC, part of Springer Nature 2019</rights><rights>COPYRIGHT 2020 Springer</rights><rights>Journal of Materials Science is a copyright of Springer, (2019). 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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. 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| subjects | Characterization and Evaluation of Materials Chemistry and Materials Science Classical Mechanics Crack sensitivity Crystallography and Scattering Methods Grain boundaries Hydrogen Materials Science Mechanical properties Metals & Corrosion Polymer Sciences Solid Mechanics Steel Steel, Automobile Structural steels Tensile strength |
| title | Study on the controlling factors for the quenching crack sensitivity of ultra-strong automotive steel |
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