Optimizing the austenite stability in a ferritic lightweight steel through thermomechanical processing

Mirshekari, B.; Zarei-Hanzaki, A.; Barabi, A.; Moshiri, A.; Abedi, H.R.; Lee, S.-J.; Fujii, Hidetoshi

doi:10.1016/j.matchar.2020.110367

Cited by 16 publications

(7 citation statements)

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“…These grain boundaries, characterized by a maximum misorientation angle of 15°, are generally a consequence of applied plastic deformation within coarser grains, as well as the process of DRX. [59,60] The formation of new grains likely influences neighboring grains, giving rise to the formation of LAGBs. A notably abundant and tightly clustered presence of both LAGBs and highangle grain boundaries (HAGBs) is observed within the LSZ in comparison to the underlying areas.…”

Section: Resultsmentioning

confidence: 99%

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Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Abbasi,

Zarei‐Hanzaki,

Charkhchian

et al. 2024

Adv Eng Mater

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The present study aims to investigate the effect of friction stir processing (FSP) on the microstructural evolutions and mechanical properties of a nonequiatomic interstitial high‐entropy alloy (HEA). To achieve this, an as‐cast FeMnCoCrN interstitial HEA undergoes FSP to modify the as‐cast microstructure and investigate the resulting effects on mechanical properties. The grain size, sub‐boundaries, martensite fraction, and accommodated strain exhibit a gradient from the base metal (BM) to the stir zone (SZ). As a result of FSP, the average grain size in the upper SZ is significantly decreased from ≈700 μm in BM to 1.5 μm, which is around 500 times finer than that of the BM. Furthermore, the martensitic transformation in a single metastable face‐centered‐cubic phase specifically occurs in the thermomechanical‐affected and heat‐affected zones. Continuous and geometric dynamic recrystallizations triggered by FSP lead to the development of a refined equiaxed microstructure. This gradient microstructure, in turn, plays a pivotal role in achieving significantly improved mechanical properties when compared to the as‐cast microstructure. Remarkably, the yield strength doubles, the ultimate tensile strength increases from 548 to 852 MPa, and ductility increases by 16%.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Abbasi,

Zarei‐Hanzaki,

Charkhchian

et al. 2024

Adv Eng Mater

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“…There is more residual austenite in the SS layers, as shown in Figure 4d-f. This could be attributed to the presence of more austenite stabilizers in the SS layer, such as Cr and Mn [43]. In contrast to the complex microstructural evolution observed in the LCS layer, the microstructures observed in the SS layer at different annealing temperatures were similar, as shown in Figure 3.…”

Section: Microstructurementioning

confidence: 85%

Enhancing Mechanical Properties: Exploring the Effect of Annealing Temperature on Wire Arc Additively Manufactured High-Strength Steel

Chen,

Hao,

et al. 2023

Materials

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This study investigates the mechanical properties of exceptionally high-strength steel produced by wire and arc additive manufacturing (WAAM), using the 304 stainless steel wire and the low carbon wire (LCS). The study found that annealing treatment can enhance the steel’s mechanical properties. The microstructure in the LCS layer changed from ferrite to bainite and then to a mixture of austenite, pearlite, and bainite with increasing annealing temperature. In contrast, the SS layer retained its martensitic structure, albeit with altered lath sizes. The annealing treatment also improved the orientation of the grains in the steel. The optimal annealing temperature observed for the steel was 900 ℃, which resulted in a maximum tensile strength of 1176 MPa along the Y direction and 1255 MPa along the Z direction. Despite the superior mechanical properties, the LCS layer still exhibited failure during tensile testing due to its lower hardness. The study suggests that annealing treatment can be a useful technique for enhancing the mechanical properties of high-strength steel in WAAM applications.

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“…2a and 3a). The darkest areas are represented by martensite due to its highest dislocation density [29]. It can be seen that for the undeformed alloy containing 5% Mn, more MA areas were identified when compared to 3% Mn type steel (Figs.…”

Section: Ebsd Analysismentioning

confidence: 94%

Mechanical and thermal stability of retained austenite in plastically deformed bainite-based TRIP-aided medium-Mn steels

Kozłowska

Grajcar

Janik

et al. 2021

Archiv.Civ.Mech.Eng

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Advanced medium-Mn sheet steels show an opportunity for the development of cost-effective and light-weight automotive parts with improved safety and optimized environmental performance. These steels utilize the strain-induced martensitic transformation of metastable retained austenite to improve the strength–ductility balance. The improvement of mechanical performance is related to the tailored thermal and mechanical stabilities of retained austenite. The mechanical stability of retained austenite was estimated in static tensile tests over a wide temperature range from 20 °C to 200 °C. The thermal stability of retained austenite during heating at elevated temperatures was assessed by means of dilatometry. The phase composition and microstructure evolution were investigated by means of scanning electron microscopy, electron backscatter diffraction, X-ray diffraction and transmission electron microscopy techniques. It was shown that the retained austenite stability shows a pronounced temperature dependence and is also stimulated by the manganese addition in a 3–5% range.

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Optimizing the austenite stability in a ferritic lightweight steel through thermomechanical processing

Cited by 16 publications

References 50 publications

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Enhancing Mechanical Properties: Exploring the Effect of Annealing Temperature on Wire Arc Additively Manufactured High-Strength Steel

Mechanical and thermal stability of retained austenite in plastically deformed bainite-based TRIP-aided medium-Mn steels

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