Influence of Al content on the strain-hardening behavior of aged low density Fe–Mn–Al–C steels with high Al content

Wu, Zhiqiang; Ding, Hua; An, X.H.; Han, Dongmei; Liao, Xiaozhou

doi:10.1016/j.msea.2015.05.002

Cited by 86 publications

(25 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a summary of the mechanical properties measured so far for high specific strength steels, Fig. 4c and d compare the tensile properties of our HSSS with that of Kim et al [27], as well as with the conventional FeeMneAleC based austenitic [5,11,24], duplex [20,25] and triplex [17,23,26] steels. As can be seen, the HSSS in the present study shows an outstanding combination of the specific yield strength (SYS) and uniform elongation, while exhibiting an acceptable combination of the yield strength-to-ultimate tensile strength (YS-to-UTS) ratio and the uniform elongation.…”

Section: Microstructural Characterizationmentioning

confidence: 90%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

View full text Add to dashboard Cite

Keywords:High specific strength steel Dual-phase nanostructure Strain hardening Ductility In situ high-energy X-ray diffraction a b s t r a c tWe report a detailed study of the strain hardening behavior of a Fee16Mne10Ale0.86Ce5Ni (weight percent) high specific strength (i.e. yield strength-to-mass density ratio) steel (HSSS) during uniaxial tensile deformation. The dual-phase (g-austenite and B2 intermetallic compound) HSSS possesses high yield strength of 1.2e1.4 GPa and uniform elongation of 18e34%. The tensile deformation of the HSSS exhibits an initial yield-peak, followed by a transient characterized by an up-turn of the strain hardening rate. Using synchrotron based high-energy in situ X-ray diffraction, the evolution of lattice strains in both the g and B2 phases was monitored, which has disclosed an explicit elasto-plastic transition through load transfer and strain partitioning between the two phases followed by co-deformation. The unloadingreloading tests revealed the Bauschinger effect: during unloading yield in g occurs even when the applied load is still in tension. The extraordinary strain hardening rate can be attributed to the high back stresses that arise from the strain incompatibility caused by the microstructural heterogeneity in the HSSS.

show abstract

Section: Microstructural Characterizationmentioning

confidence: 90%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In previous work, the mechanical properties of Fe-(20-28)Mn-(6-12)Al-(0.6-1.2)C (wt.%) alloys were described to be same as TWIP steels [2][3][4][5]. The optimization of the chemical constituents [6,7] and the heat treatment parameters in this high Mn low density Fe-Mn-Al-C steels have been intensively investigated [8][9][10][11]. In most studies of high Mn low density Fe-Mn-Al-C steels, hot deformation behavior has been emphasized with attention being given to forming operations such as forging, extrusion or rolling.…”

Section: Introductionmentioning

confidence: 99%

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Tang

Chen

et al. 2019

Vacuum

View full text Add to dashboard Cite

The effect of Al content on the hot deformation behavior of high-Mn low density Fe-Mn-Al-C steels was investigated by the 3D processing map at the temperatures of 850-1050 °C and the strain rates of 0.001-10s-1. The high-Al steel showed a higher flow stress and a greater activation energy (443 kJ/mol) in contrast to the low-Al steel (394 kJ/mol). The microstructures of 8Al steel and 10Al steel depends on the deformation parameters. The initial hot rolling microstructure has been displaced by the recrystallized structure and substructures for both steels, while the unstable zone has deformation bands and flow localization. As the Z content increases with increasing Al content, this leads to a significant inhibition of the DRX process, resulting in an unstable domain with deformation zones and flow localization. For high-Al steel, the morphology and distribution of ferrite transform from the continuous band ferrite to discontinuous granular ferrite, moreover, the flow localization features cannot be observed with the decrease of strain rate to 0.001s-1. Furthermore, the proportion of instability region for each of the strains increases with the increasing of the Al content, the high Al content weakens the workability of the Fe-Mn-Al-C steels.

show abstract

“…It is well known that excellent candidates for energy absorbers require materials that are (i) capable of keeping a high value of the yield strength upon deformation, and (ii) able to absorb more energy up to fracture [30,32]. In addition to the high specific yield strength and the large uniform elongation under quasi-static conditions for this HSSS when compared to the other dual phase steels [11,14,[16][17][18][19], the simultaneously improved strength and the improved tensile toughness at the intermediate strain rates are very appropriate for the application of this HSSS in the automotive industry to enhance safety during a vehicle crash since the applied strain rate range for vehicle crushing is generally between 1 and 100/s (intermediate strain rates) [51][52][53][54][55] or even higher.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, high specific strength steels (HSSS) with low density, achieved by adding Al (3-12 wt. %), have been widely studied due to their excellent mechanical properties, such as high specific yield strengths and large uniform elongations [8][9][10][11][12][13][14][15][16][17][18][19]. Most of these HSSS are based on Fe-Al-Mn-C alloy system (so called TRIPLEX steels), and consist of fcc austenite matrix, bcc ferrite matrix and finely dispersed κ-carbides ((Fe, Mn) 3 AlC.…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Effect on Tensile Behavior for a High Specific Strength Steel: From Quasi-Static to Intermediate Strain Rates

Wang

Yang

et al. 2017

Metals

View full text Add to dashboard Cite

Abstract:The strain rate effect on the tensile behaviors of a high specific strength steel (HSSS) with dual-phase microstructure has been investigated. The yield strength, the ultimate strength and the tensile toughness were all observed to increase with increasing strain rates at the range of 0.0006 to 56/s, rendering this HSSS as an excellent candidate for an energy absorber in the automobile industry, since vehicle crushing often happens at intermediate strain rates. Back stress hardening has been found to play an important role for this HSSS due to load transfer and strain partitioning between two phases, and a higher strain rate could cause even higher strain partitioning in the softer austenite grains, delaying the deformation instability. Deformation twins are observed in the austenite grains at all strain rates to facilitate the uniform tensile deformation. The B2 phase (FeAl intermetallic compound) is less deformable at higher strain rates, resulting in easier brittle fracture in B2 particles, smaller dimple size and a higher density of phase interfaces in final fracture surfaces. Thus, more energy need be consumed during the final fracture for the experiments conducted at higher strain rates, resulting in better tensile toughness.

show abstract

Influence of Al content on the strain-hardening behavior of aged low density Fe–Mn–Al–C steels with high Al content

Cited by 86 publications

References 26 publications

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Strain Rate Effect on Tensile Behavior for a High Specific Strength Steel: From Quasi-Static to Intermediate Strain Rates

Contact Info

Product

Resources

About