Quasi-Static and Dynamic Deformation Behavior of Fe-11Mn-4Al-0.2C Medium-Mn Steel

doi:10.12068/j.issn.1005-3026.2024.09.004

Abstract

Abstract:

The evolution of plasticizing mechanism and mechanical properties of the Fe-11Mn-4Al-0.2C medium-Mn steel during deformation were compared in this paper. With the increase of strain rate （0.002~200 s^-1）， the trends of changes in yield strength and tensile strength for the medium-Mn steel are completely opposite. The yield strength increases from 507 MPa to 649 MPa， while the tensile strength decreases from 1 089 MPa to 876 MPa. The plasticizing mechanism of quasi?static loading is dominated by the strong TRIP （transformation?induced plasticity） effect. The plasticizing mechanism is dominated by the weak TRIP effect in the initial stage of dynamic loading， and the TRIP effect disappears and the plasticizing mechanism changes into the temperature rise softening effect and the TWIP （twinning?induced plasticity） effect in the later stage of dynamic loading. The dislocation motion rate in the initial stage of dynamic loading is much higher than that of quasi?static loading， which results in the higher yield strength of dynamic loading than that of quasi?static loading. With the increase of strain， the cumulative adiabatic temperature rise inhibits the martensitic transformation and reduces the work?hardening capacity under dynamic loading， while the high hardness martensite is produced continuously under quasi?static loading， which results in the tensile strength of quasi?static loading higher than that of dynamic loading.

Key words: medium-Mn steel, quasi?static, dynamic, interrupt tensile, plasticizing mechanism

CLC Number:

TP 20

Yi FENG, De-liang ZHANG, Zhi-hui CAI, Guang-jie HUANG. Quasi-Static and Dynamic Deformation Behavior of Fe-11Mn-4Al-0.2C Medium-Mn Steel[J]. Journal of Northeastern University(Natural Science), 2024, 45(9): 1244-1251.

Figures/Tables 16

Fig.1 Dimensions of tensile test specimen（unit: mm）

Fig.2 Mechanical properties of medium-Mn steel

Fig.3 Dimensions of fish bone tensile specimen （X=11，12.25，14.75；unit：mm）

Fig.4 External fixture device

Fig.5 Interrupt tensile test of medium-Mn steel

Fig.6 Micro?morphologies of the undeformed medium- Mn steel sample quenched at 850 ℃

Fig.7 Mass fractions of Mn，C and Al in the microstructure of the undeformed medium-Mn steel

Fig.8 Morphologies of medium-Mn steel samples under quasi?statical loading with different strains?T=?Qρcp=gρcp∫ε2ε1σtdεt . （2）

Fig.9 Morphologies of medium-Mn steel samples under dynamical loading with different strains

Fig.10 Result of XRD measurement of the samples under the different strains

Table 1 Adiabatic temperature rise under dynamic

工程应变	0.10	0.25	0.35	0.40(断裂)
0.2 s^-1绝热温升/K	15	45	68	77

Fig.11 Contour plots of the orientation distribution function (ODF) for austenite with ?2=45° at εe=0.10

Fig.12 TEM micrographs of the specimen tensile fracture at different strain rates

Table 2 Stacking fault energy under dynamic loading

工程应变	0.10	0.25	0.35	0.40
0.2 s^-1层错能/（mJ·m^-2）	11.8	18.2	23.1	25.1

Fig.13 MWH algorithm of the undeformed and initial deformation samples

Table 3 Austenite dislocation density of the undeformed and initial deformation samples

应变速率/s^-1	工程应变	奥氏体位错密度/m^-2
0	0	7.71e+14
0.002	0.10	21.12e+14
0.2	0.10	20.57e+14

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