| Hydrogen effect on the mechanical behaviour and microstructural features of a Fe-Mn-C twinning induced plasticity steel |
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| 引用本文： | Xiaofei Guo,Stefan Zaefferer,Fady Archie,Wolfgang Bleck. Hydrogen effect on the mechanical behaviour and microstructural features of a Fe-Mn-C twinning induced plasticity steel[J]. 矿物冶金与材料学报, 2021, 28(5): 835-846 |
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| 作者姓名： | Xiaofei Guo Stefan Zaefferer Fady Archie Wolfgang Bleck |
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| 作者单位： | Steel Institute, RWTH Aachen University, Intze-str. 1, Aachen 52072, Germany;Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Stra?e 1, Düsseldorf 40237, Germany;NLMK Europe, Eutelis-Platz 2, Ratingen 40878, Germany |
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| 基金项目： | This work was supported by German Research Founda-tion(DFG)in the framework of the Collaborative Research Center SFB 761"Steel ab initio".The authors also acknow-ledge Dr.Sergiy Merzlikin and Ms.Monika Nellessen from Max-Planck Institute für Eisenforschung for their help in car-rying out the TDS and |
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| 摘 要： | The influences of hydrogen on the mechanical properties and the fracture behaviour of Fe-22Mn-0.6C twinning induced plasticity steel have been investigated by slow strain rate tests and fractographic analysis.The steel showed high susceptibility to hydrogen embrittlement,which led to 62.9%and 74.2%reduction in engineering strain with 3.1 and 14.4 ppm diffusive hydrogen,respectively.The fracture surfaces revealed a transition from ductile to brittle dominated fracture modes with the rising hydrogen contents.The underlying deformation and fracture mechanisms were further exploited by examining the hydrogen effects on the dislocation substructure,stacking fault probability,and twinning behaviour in pre-strained slow strain rate test specimens and notched tensile specimens using coupled electron channelling contrast imaging and electron backscatter diffraction techniques.The results reveal that the addition of hydrogen promotes planar dislocation structures,earlier nucleation of stacking faults,and deformation twinning within those grains which have tensile axis orientations close to<111>//rolling direction and<112>//rolling direction.The developed twin lamellae result in strain localization and micro-voids at grain boundaries and eventually lead to grain boundary decohesion.
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| 关 键 词： | twinning induced plasticity steel hydrogen mechanical behaviour DISLOCATION TWINNING electron channelling contrast imaging |
Hydrogen effect on the mechanical behaviour and microstructural features of a Fe–Mn–C twinning induced plasticity steel |
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| Xiaofei Guo,Stefan Zaefferer,Fady Archie,Wolfgang Bleck. Hydrogen effect on the mechanical behaviour and microstructural features of a Fe–Mn–C twinning induced plasticity steel[J]. International Journal of Minerals,Metallurgy and Materials, 2021, 28(5): 835-846 |
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| Authors: | Xiaofei Guo Stefan Zaefferer Fady Archie Wolfgang Bleck |
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| Abstract: | The influences of hydrogen on the mechanical properties and the fracture behaviour of Fe–22Mn–0.6C twinning induced plasticity steel have been investigated by slow strain rate tests and fractographic analysis. The steel showed high susceptibility to hydrogen embrittle-ment, which led to 62.9％ and 74.2％ reduction in engineering strain with 3.1 and 14.4 ppm diffusive hydrogen, respectively. The fracture sur-faces revealed a transition from ductile to brittle dominated fracture modes with the rising hydrogen contents. The underlying deformation and fracture mechanisms were further exploited by examining the hydrogen effects on the dislocation substructure, stacking fault probability, and twinning behaviour in pre-strained slow strain rate test specimens and notched tensile specimens using coupled electron channelling contrast imaging and electron backscatter diffraction techniques. The results reveal that the addition of hydrogen promotes planar dislocation structures, earlier nucleation of stacking faults, and deformation twinning within those grains which have tensile axis orientations close to <111>//rolling direction and <112>//rolling direction. The developed twin lamellae result in strain localization and micro-voids at grain boundaries and even-tually lead to grain boundary decohesion. |
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| Keywords: | twinning induced plasticity steel hydrogen mechanical behaviour dislocation twinning electron channelling contrast imaging |
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