Effect of Pre-strain and High Stresses on the Bainitic Transformation of Manganese-boron Steel 22MnB5

Schicchi, Diego Said; Hunkel, M.

doi:10.1007/s11661-018-4585-4

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…In the work of [28], the interaction of stress and phase transformation is discussed for various steels. Their findings of a accelerated phase transformations due to stresses where confirmed for a bainitic transformation at the steel 22MnB5 by [29]. In addition, a lower martensite start temperature due to a carbon enrichment of the austenitic phase during bainite formation can affect the bainite content in the transition zone, which was investigated in the work of [30,31] for a Si-steel regarding an incomplete bainite formation.…”

Section: Microstructure and Hardnessmentioning

confidence: 83%

Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

et al. 2020

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Internal Quenching is an innovative heat treatment method for difficult to access component sections. Especially, the microstructure, as well as the residual stress state at inner surfaces, of thick-walled tubes can be adjusted with the presented flexible heat treatment process. Based on multiphysical FE-models of two different steels, a simulative optimization study, considering different internal quenching strategies, was performed in order to find the optimal cooling conditions. The focus hereby was on the adjustment of a martensitic inner surface with high compressive residual stresses. The simulatively determined optimal cooling strategies were carried out experimentally and analyzed. A good agreement of the resulting hardness and residual stresses was achieved, validating the presented Fe-model of the Internal Quenching process. The shown results also indicate that the arising inner surface state is very sensitive to the transformation behavior of the used steel. Furthermore, the presented study shows that a preliminary simulative consideration of the heat treatment process helps to evaluate significant effects, reducing the experimental effort and time.

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Section: Microstructure and Hardnessmentioning

confidence: 83%

Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

et al. 2020

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“…The experiments show a strong nonlinearity of the transformation plasticity of the bainite transformation and differences between tension and pressure cases. The effect on the bainitic transformation of various degrees of applied stresses in the range of 0 to 250

, various degrees of deformation in the range of 0 to 18% and the transformation plasticity effect are investigated in the work in [ 40 ]. For example, in Figure 1 the influence of applied stress on the bainite transformation kinetics is shown [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

“… Comparison of simulated and experimental kinetics of the bainitic transformation in regard of applying different stresses for ( a ) 450

, ( b ) 500

and ( c ) 550

(adapted from [ 40 ]). …”

Section: Figurementioning

confidence: 99%

Modeling Bainitic Transformations during Press Hardening

et al. 2021

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We revisit recent findings on experimental and modeling investigations of bainitic transformations under the influence of external stresses and pre-strain during the press hardening process. Experimentally, the transformation kinetics in 22MnB5 under various tensile stresses are studied both on the macroscopic and microstructural level. In the bainitic microstructure, the variant selection effect is analyzed with an optimized prior-austenite grain reconstruction technique. The resulting observations are expressed phenomenologically using a autocatalytic transformation model, which serves for further scale bridging descriptions of the underlying thermo-chemo-mechanical coupling processes during the bainitic transformation. Using analyses of orientation relationships, thermodynamically consistent and nondiagonal phase field models are developed, which are supported by ab initio generated mechanical parameters. Applications are related to the microstructure evolution on the sheaf, subunit, precipitate and grain boundary level.

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Influence of the parent phase on the bainitic transformation under large stress of manganese-boron steel 22MnB5

Schicchi

Hunkel

2019

Materials Characterization

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Effect of Pre-strain and High Stresses on the Bainitic Transformation of Manganese-boron Steel 22MnB5

Cited by 4 publications

References 40 publications

Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

Modeling Bainitic Transformations during Press Hardening

Influence of the parent phase on the bainitic transformation under large stress of manganese-boron steel 22MnB5

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