Recrystallization Behavior and Texture Evolution in Low Carbon Steel during Hot Deformation in Austenite/Ferrite Region

He, Guoqiu; Peng, Tianen; Jiang, Bo; Hu, Xuewen; Liu, Yazheng; Wang, Chun-Jing

doi:10.1002/srin.202100047

Cited by 7 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The yellow grains were substructures without deformation energy. [ 35 ] With the temperature of 880 °C and the strain rate of 10 s −1 , some of the original microstructures failed to rapidly nucleate and grow after crushing. They still maintain a higher deformation storage energy.…”

Section: Resultsmentioning

confidence: 99%

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Feng,

Zhang,

Zhang

et al. 2023

steel research int.

Self Cite

View full text Add to dashboard Cite

Low‐carbon microalloyed steel with the microstructure of bainite is frequently utilized to produce automotive parts. The systematic investigation of the hot deformation behavior can serve as a reference for the optimization of deformation process parameters. The hot deformation of 0.2C–2.0Mn–0.5Cr microalloyed steel is studied. Based on the stress–strain curve, an Arrhenius model with strain compensation is established. The correlation coefficient R2 and the average absolute relative error calculated according to this model are 0.962 and 4.871%. The microstructure evolution at the strain of 0.90 is studied. In the stable region with substantial power dissipation, the microstructure is uniformly fine. The strain rate is high in the stable region with low‐power dissipation, and the room‐temperature microstructure after deformation retains a large amount of deformation storage energy and fine substructures. During deformation, the banded structures are formed in the instable region. The difference in dislocation density between the band structure and the nearby regions promotes the formation of necklace microstructures. Therefore, the 0.2C–2.0Mn–0.5Cr microalloyed steel has an ideal deformation process window in the range of a hot deformation temperature of 880–920 °C and a strain rate of 0.1–0.3 s−1.

show abstract

Section: Resultsmentioning

confidence: 99%

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Feng,

Zhang,

Zhang

et al. 2023

steel research int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the ferrite region, the EBSD maps of the microstructures were basically the same, and mostly contained deformed grains. Dynamic recrystallization (DRX) of ferrite did not readily occur and dynamic recovery (DRV) was the main softening mechanism, due to the high stacking fault energy (SFE) of the BCC structure, which was susceptible to dislocation climb and cross slip [ 35 ]. According to the previous study [ 36 ], the width of extended dislocation is small in high SFE materials, which commonly leads to the clustered imperfect dislocations.…”

Section: Resultsmentioning

confidence: 99%

“…It is worth noting that the proportion of HAGBs is close to 90% at 800 °C and 1 s −1 , even at a lower percentage of recrystallized grains, indicating that the substructures were not composed of subgrains with LAGBs. DRV excessively consumed the distortion energy at a higher temperature [ 35 , 37 ], so there was a high proportion of both substructures and HAGBs.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Texture Evolution in Low Carbon and Low Alloy Steel during Warm Deformation

Shu

et al. 2022

Materials

View full text Add to dashboard Cite

Warm compression tests were carried out on low carbon and low alloy steel at temperatures of 600–850 °C and stain rates of 0.01–10 s−1. The evolution of microstructure and texture was studied using a scanning electron microscope and electron backscattered diffraction. The results indicated that cementite spheroidization occurred and greatly reduced at 750 °C due to a phase transformation. Dynamic recrystallization led to a transition from {112}<110> texture to {111}<112> texture. Below 800 °C, the intensity and variation of texture with deformation temperature is more significant than that above 800 °C. The contents of the {111}<110> texture and {111}<112> texture were equivalent above 800 °C, resulting in the better uniformity of γ-fiber texture. Nucleation of <110>//ND-oriented grains increased, leading to the strengthening of <110>//ND texture. Microstructure analysis revealed that the uniform and refined grains can be obtained after deformation at 800 °C and 850 °C. The texture variation reflected the fact that 800 °C was the critical value for temperature sensitivity of warm deformation. At a large strain rate, the lowest dislocation density appeared after deformation at 800 °C. Therefore, 800 °C is a suitable temperature for the warm forming application, where the investigated material is easy to deform and evolves into a uniform and refined microstructure.

show abstract

“…During hot rolling, these columnar grains form elongated deformation bands with subgrains. In high stacking fault energy BCC metals such as 441, cross slip and climb of these dislocations occur quite easily, which promotes dynamic recovery instead of dynamic recrystallization making it difficult to achieve grain refinement [7]. Hence ways of achieving grain refinement include controlling the rolling parameters such as temperature, strain rate and strain [8]; deformation around particles (these particles are high strain points which become deformation zones for grain evolution) [9][10]; and starting deformation with finer grains [11].…”

Section: Introductionmentioning

confidence: 99%

Evolution of microstructures in high and low Ti/Al ratio ferritic stainless steels after hot rolling

Asante,

Siyasiya

2023

MATEC Web Conf.

View full text Add to dashboard Cite

The evolution of microstructures after hot rolling was studied on high and low Ti/Al ratio ferritic stainless steels. The steels were hot rolled using the Gleeble 1500D® thermomechanical simulation machine. The evolution of the microstructures was compared using the electron backscattered diffraction (EBSD) mode of scanning electron microscope (SEM) and optical microscopy (OM) methods by studying the grain sizes and recrystallization after hot rolling. The results showed that after hot rolling, the grain structure of the high Ti/Al ratio steel was more pancake like and smaller with high volume fraction of recrystallized grains. These recrystallised grains were mostly localised around TiNb(C,N) particles, which suggested particle stimulated nucleation (PSN) of grains. It was therefore seen that PSN occurred in both steels and therefore there was supposed fine grains and improved texture in both steels but the initial grain size prior to deformation overrides the effect of occurrence of PSN. Starting deformation with fine grained material yields higher recrystallization microstructures and textures.

show abstract

Recrystallization Behavior and Texture Evolution in Low Carbon Steel during Hot Deformation in Austenite/Ferrite Region

Abstract: Figure 9. a) Typical optical micrographs; b) EBSD maps of recrystallized, substructure, and deformed grains at 835 C; c) misorientation angle distributions.

Cited by 7 publications

References 35 publications

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Microstructure and Texture Evolution in Low Carbon and Low Alloy Steel during Warm Deformation

Evolution of microstructures in high and low Ti/Al ratio ferritic stainless steels after hot rolling

Contact Info

Product

Resources

About