EBSD study on the effect of second phases and restoration mechanisms in hot deformed new Mn–Ni–Cr alloy

Motlagh, Z. Sangari; Momeni, Amir; Tolaminejad, B.; Javaheri, Vahid; Soltanalinezhad, M.

doi:10.1016/j.matchemphys.2022.125771

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…However, when the strain rate increased to 1000 s −1 , the dislocation density decreased and a significant increase in the amount of fine grains characterized by low‐angle boundaries was observed. This effect may indicate the occurrence of dynamic recovery, [ 36 ] which requires the formation of subgrains in the microstructure. At the same time, in 5Mn steel, some amount of fine grains with low‐angle and high‐angle grain boundaries can be already seen in the sample deformed at 250 s −1 .…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Morawiec

Grajcar

Krawczyk

et al. 2023

steel research int.

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The comparison of the dynamic mechanical behavior and microstructure of two medium manganese sheet steels (3Mn–Al and 5Mn–Al) alloyed with aluminum is aimed. Mechanical properties under dynamic tensile loads are determined by means of rotary hammer dynamic tests at strain rates of 250 and 1000 s−1 and analyzed together with the results of static tensile test. It is found that the results are significantly affected by the variations in Mn content in the range from 3 to 5 wt%. In both steels, the tensile strength increases with increasing strain rate, but the variation in the strain rate range has a moderate effect on mechanical behavior. The highest ultimate tensile strength of 1475 MPa is measured in the 5Mn–Al steel, whereas the 3Mn–Al steel is characterized by better total elongation due to a larger fraction of retained austenite and more pronounced transformation‐induced plasticity effect. The results show that the mechanical properties of 3Mn steel are more strain rate sensitive than those of 5Mn steel. The microstructural features are characterized qualitatively and quantitatively by X‐ray diffraction, scanning electron microscopy, and electron back‐scattered diffraction techniques.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Morawiec

Grajcar

Krawczyk

et al. 2023

steel research int.

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show abstract

“…Nevertheless, although the final strain is augmented to 1.20, the distribution of δ phase is still very dense. Due to the strong pinning effect of closed-set δ phases, the growth of these recrystallized grains is strongly inhibited [49]. Therefore, even though the final strain increases, only slight growth of recrystallized grains occurs.…”

Section: Effect Of Final Strainmentioning

confidence: 99%

Investigation on Mechanism of Microstructure Evolution during Multi-Process Hot Forming of GH4169 Superalloy Forging

Chen,

Cai,

Lin

et al. 2024

Materials

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Typically, in the manufacturing of GH4169 superalloy forgings, the multi-process hot forming that consists of pre-deformation, heat treatment and final deformation is required. This study focuses on the microstructural evolution throughout hot working processes. Considering that δ phase can promote nucleation and limit the growth of grains, a process route was designed, including pre-deformation, aging treatment (AT) to precipitate sufficient δ phases, high temperature holding (HTH) to uniformly heat the forging, and final deformation. The results show that the uneven strain distribution after pre-deformation has a significant impact on the subsequent refinement of the grain microstructure due to the complex coupling relationship between the evolution of the δ phase and recrystallization behavior. After the final deformation, the fine-grain microstructure with short rod-like δ phases as boundaries is easy to form in the region with a large strain of the pre-forging. However, necklace-like mixed grain microstructure is formed in the region with a small strain of the pre-forging. In addition, when the microstructure before final deformation consists of mixed grains, dynamic recrystallization (DRX) nucleation behavior preferentially depends on kernel average misorientation (KAM) values. A large KAM can promote the formation of DRX nuclei. When the KAM values are close, a smaller average grain size of mixed-grain microstructure is more conductive to promote the DRX nucleation. Finally, the interaction mechanisms between δ phase and DRX nucleation are revealed.

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A novel recrystallization annealing method to cooperatively control the grain size and δ phase content for initial aged GH4169 superalloy forging

Cai

Chen

et al. 2023

Materials Characterization

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EBSD study on the effect of second phases and restoration mechanisms in hot deformed new Mn–Ni–Cr alloy

Cited by 3 publications

References 45 publications

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Investigation on Mechanism of Microstructure Evolution during Multi-Process Hot Forming of GH4169 Superalloy Forging

A novel recrystallization annealing method to cooperatively control the grain size and δ phase content for initial aged GH4169 superalloy forging

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