Transformation plasticity at different phase transformations of bearing steel

Dalgic, M.; Löwisch, G.

doi:10.1002/mawe.200500971

Cited by 21 publications

(8 citation statements)

References 14 publications

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“…The change from linear to non-linear behavior was observed for both tensile and compressive stresses ( Figure 6), whereas the TP magnitudes were higher for tensile stresses. This asymmetric behavior has been observed earlier for bainitic and martensitic reactions [15,40], and it has been shown that the degree of anisotropy increased upon increasing the carbon amount dissolved in austenite. For the martensitic transformations, this behavior was attributed to a change in martensite morphology upon increasing the carbon content.…”

Section: Resultssupporting

confidence: 80%

Evolution of transformation plasticity during bainitic transformation

Lambers

Tschumak

Maier

et al. 2011

International Journal of Materials Research

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The influences of prior austenitization treatment and state of applied stresses on the evolution of transformation plasticity (TP) strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of TP strain under superimposed elastic stresses is dictated by both the prior austenite grain size (AGS) and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in TP strains similar to those obtained when a permanent stress equivalent to the 0.01% offset yield strength of the supercooled austenite is applied. Another important result is that lower TP strains were observed when decreasing the AGS, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of AGS and the particular 0.01% offset yield strength of the supercooled austenite in limiting the TP strains, which has to be incorporated into current models involving bainitic phase transformations.

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Section: Resultssupporting

confidence: 80%

Evolution of transformation plasticity during bainitic transformation

Lambers

Tschumak

Maier

et al. 2011

International Journal of Materials Research

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“…[20,24,25,[31][32][33] However, during forging the heating and cooling rates can be extremely high, which necessitates the availability of transformation kinetics data for various temperature-time paths. In order to shed light on the effect of austenitization temperature and time on the isothermal phase transformation kinetics, two different heat treatments were considered in the current work: a conventional heat treatment based on available time-temperature-transformation diagrams [1] and one derived from an actual forging process.…”

Section: Introductionmentioning

confidence: 99%

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

Lambers

Tschumak

Maier

et al. 2009

Metall Mater Trans A

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The role of time-temperature path on the isothermal austenite-to-bainite phase transformation of low alloy 51 CrV 4 steel was investigated and the corresponding microstructures were analyzed. The important finding is that an incomplete initial austenitization treatment leaves undissolved carbides in the matrix, such that lower carbon and chromium content in the matrix result, eventually accelerating the phase transformation. Furthermore, the residual carbides constitute additional nucleation sites for the bainite plates, speeding up the process even further. Also, both plastic pre-deformation of the supercooled austenite and application of external elastic stresses during the phase transformation lead to transformation plasticity by enhancing the stress fields, providing a driving force for the growth of bainite plates along a preferred orientation. Overall, the current results constitute the first step toward establishing a database for constructing a realistic microstructure-based model for simulating metal forming operations involving austenite-to-bainite phase transformation.

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“…For TRIP during martensitic transformation for 100Cr6 we refer to [25,32,26]. Different values for j under tension (labelled by j + ) and compression (j -), respectively, have been reported.…”

Section: Transformation-induced Plasticity (Trip)mentioning

confidence: 98%

Some recent developments in modelling of heat‐treatment phenomena in steel within the collaborative research centre SFB 570 “Distortion Engineering”

Wolff¹,

Böhm²,

Bökenheide³

et al. 2012

Materialwissenschaft Werkst

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Some recent developments in modelling of heat-treatment phenomena in steel within the collaborative research centre SFB 570 "Distortion Engineering"Einige aktuelle Entwicklungen in der Modellierung von Phänomenen der Wärmebehandlung beim Stahl im Sonderforschungsbereich SFB 570 "Distortion Engineering"It is the aim to present some developments in modelling of distortion-related phenomena during heat treatment of steel in the context of the Collaborative Research Centre SFB 570 "Distortion Engineering" at the Bremen University, Germany. Taking this into account, a survey will be given and some results will be exemplarily presented. This work is the first contribution to the session "Modelling of material behaviour within the CRC Distortion Engineering" of the 3 Bökenheide et al. 2011 [2] deal in detail with the steel qualities 100Cr6 (SAE 52100) and 20MnCr5 (SAE 5120), respectively. Here, more general aspects of the subsequent phenomena are in the focus: Phase transformations (PT) and transformation-induced plasticity (TRIP) during quenching and heating, plastic behaviour of (supercooled) austenite as well as creep during heating and austenitising. The following items will be considered in particular: Experiments and processing strategies for experimental data, model approaches and results for single phenomena of material behaviour. Many assertions have a general character not linked to special steel sorts. We will also address open questions and possible perspectives. IntroductionIt is the aim to present the development of modelling of steel phenomena which are relevant to distortion of work-pieces during heat treatment in the context of the Collaborative Research Centre SFB 570 "Distortion Engineering" at the University of Bremen. The main concept of this long-time research project (started in 2001) is a system-oriented view on distortion. For a comprehensive explanation we refer to [3].

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Transformation plasticity at different phase transformations of bearing steel

Cited by 21 publications

References 14 publications

Evolution of transformation plasticity during bainitic transformation

Evolution of transformation plasticity during bainitic transformation

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

Some recent developments in modelling of heat‐treatment phenomena in steel within the collaborative research centre SFB 570 “Distortion Engineering”

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