Influence of Temperature on Phase Transformation and Deformation Mechanisms of Cast CrMnNi-TRIP/TWIP Steel

Stefan Martin; Steffen Wolf; Ulrich Martin; Lutz Krüger

doi:10.4028/www.scientific.net/SSP.172-174.172

Paper Titles

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Effects of Transformation Temperature on Variant Grouping of Bainitic Ferrite in Low Carbon Steel
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Elastic and Dielectric Measurements of the Structural Transformations in the Ferroelectric Perovskite (Na_1/2Bi_1/2)_1-XBa_XTiO₃
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Promoting Isothermal Martensite Formation by High Temperature Heat Treatments in a Precipitation Hardening Austenitic Stainless Steel
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Influence of Temperature on Phase Transformation and Deformation Mechanisms of Cast CrMnNi-TRIP/TWIP Steel
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Neutron Diffraction Study of a CuAlBe Shape Memory Alloy
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The Use of Barkhausen Noise to Study the Martensitic Phase Transformation
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Effects of Cooling Rate and Sn Addition on the Microstructure of Ti-Nb-Sn Alloys
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Microstructural Control of the Austenite Stability in Low-Alloyed TRIP Steels
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Influence of Temperature on Phase Transformation and Deformation Mechanisms of Cast CrMnNi-TRIP/TWIP Steel

Abstract:

At different temperatures ranging from ‑60°C to 200°C a cast CrMnNi-TRIP steel was deformed by uniaxial tension. The resulting microstructure was investigated using XRD, EBSD and LOM. The correlation of the phase transformation with the deformation temperature was examined. Depending on temperature, a transition in the deformation mechanisms was observed. Starting with the generation of deformation bands, accompanied by martensitic phase transformation, followed by twinning, the deformation mechanism turned to conventional dislocation glide with raising temperature. Between -60°C and 20°C the TRIP (TRansformation Induced Plasticity)-effect is the dominating deformation mechanism, whereas between 20°C and 200°C the TWIP (Twinning induced plasticity) effect is observed. The geometrical arrangement of martensite within the microstructure is considered within this study. The amount of α'-martensite is mainly responsible for the hardening rate and the resulting mechanical properties.