Deformation induced ferrite transformation in low carbon steels

Han, Dong; Sun, Xinjun

doi:10.1016/j.cossms.2006.02.014

Cited by 134 publications

(50 citation statements)

References 25 publications

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“…The present results as well as those reported earlier 5,[12][13][14][15]39) indicate that DT ferrite probably forms during the finishing stages of strip rolling, when pancaking accompanied by strain accumulation takes place at temperatures below the Tnr but above the Ae3. This view is supported by the drops in mean flow stress (MFS) that take place above the Ae3 in rolling simulations.…”

Section: Industrial Implicationssupporting

confidence: 79%

Dynamic Transformation Behavior of a Deformed High Carbon Steel at Temperatures Above the Ae3

et al. 2013

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The dynamic transformation behavior of deformed austenite was studied in a 0.79%C high carbon steel over the temperature range 743-823°C. The experiments were carried out in torsion under an atmosphere of argon and 5% H2. All these temperatures are above the orthoequilibrium Ae3 temperature of the steel. Strains of 0.25-4 were applied at a strain rate of 4 s -1 . The experimental parameters were varied in order to determine the effects of strain and temperature on the formation of strain-induced ferrite and cementite. The critical strain for dynamic transformation was about 0.20. The volume fractions of the transformed phases increased with strain and decreased with temperature. The observed ferrite structures are Widmanstätten in nature and appear to have formed displacively. The carbon diffusion times required for formation of the observed spheroidal cementite particles were calculated; these are consistent with the occurrence of interstitial diffusion during deformation. Similar calculations indicate that substitutional diffusion does not play a role during dynamic transformation.

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Section: Industrial Implicationssupporting

confidence: 79%

Dynamic Transformation Behavior of a Deformed High Carbon Steel at Temperatures Above the Ae3

et al. 2013

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“…It has been observed that a finer prior-austenite grain size before deformation increases the extent of DIF [37]. In the present study, in contrast to the observations of [13,17,[38][39][40][41][42][43][44][45][46], DIF was promoted by a larger prioraustenite grain size, arising from the reheating process between first and final deformation. As shown in With increasing the finishing deformation strain to 0.6 (C-10), the maximum peak orientation changed back to (112) 1 10 .…”

Section: Simulation Of Texturecontrasting

confidence: 56%

The effect of thermomechanical controlled processing on recrystallisation and subsequent deformation-induced ferrite transformation textures in microalloyed steels

et al. 2018

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The evolution of texture components for two experimental 0.06 wt% C steels, one containing 0.03 wt% Nb (Nb steel) and the second containing both 0.03 wt% Nb and 0.02 wt% Ti (Nb-Ti steel), was investigated following a new thermomechanical controlled process route, comprising first deformation, rapid reheat to 1200°C and final deformation to various strains. Typical deformation textures were observed after first deformation for both steels. Following subsequent reheating to 1200°C for various times, the recrystallisation textures consisted primarily of the a-011 h i//RD texture fibre with a weak c-{111}//ND texture fibre, similar to deformation textures, indicative of the dominance of a strain-induced boundary migration mechanism. The texture components after finish deformation were different from the rough deformation textures, with a strong a-011 h i//RD texture fibre at the beginning, and then the strong peaks move to (111) 1 21 and (111) 1 12 textures due to the deformation-induced ferrite (DIF) transformation. The effect of Ti on the recrystallisation textures and deformation textures has also been analysed in this study. The results illustrate that Ti significantly influences the c-{111}//ND texture fibre. Finally, the textures after deformation and recrystallisation in the austenite were calculated based on the K-S orientation relationship between the austenite and ferrite. This allowed the understanding of the mechanism of recrystallisation between first and final deformation and the DIF textures during phase transformation.

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“…Our steel in its hot rolled state has an almost full austenite microstructure (Figure 4(a)). The austenite grains are significantly refined during warm rolling process and partially transform to ferrite during intercritical annealing process (Figure 4(b)) [19]. A large amount of austenite grains ( ∼ 56%) in WR + IA sample have transformed to martensite during plastic deformation by strain induced transformation mechanism (Figure 4(c)) [20].…”

Section: Resultsmentioning

confidence: 98%

Strong and ductile medium Mn steel without transformation-induced plasticity effect

Huang

2018

Materials Research Letters

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The conventional alloy design of medium Mn steel is to optimize the transformation-induced plasticity (TRIP) effect. Here we show that a dual-phase heterogeneous structure is sufficient to develop a medium Mn steel with high yield strength ( ∼ 1.2 GPa) and large uniform elongation ( ∼ 14.5%). The ultra-high strength is contributed by high back-stress while the large ductility is induced by strain-gradient plasticity and back-stress hardening, both of which are inherent to dual-phase heterogeneous structure. TRIP effect is suppressed during plastic deformation. Therefore, medium Mn steel can be strong and ductile by engineering dual-phase heterogeneous structure without resorting to TRIP effect. IMPACT STATEMENTWe demonstrate that medium Mn steel can be strong and ductile by engineering dual-phase heterogeneous structure without resorting to the conventional transformation-induced plasticity (TRIP) effect. ARTICLE HISTORY

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Deformation induced ferrite transformation in low carbon steels

Cited by 134 publications

References 25 publications

Dynamic Transformation Behavior of a Deformed High Carbon Steel at Temperatures Above the Ae3

Dynamic Transformation Behavior of a Deformed High Carbon Steel at Temperatures Above the Ae3

The effect of thermomechanical controlled processing on recrystallisation and subsequent deformation-induced ferrite transformation textures in microalloyed steels

Strong and ductile medium Mn steel without transformation-induced plasticity effect

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