The significant impact of pre-strain on the structure-mechanical properties relationship in cold-rolled medium manganese TRIP steel

Li, Z.C.; Misra, R.D.K.; Ding, Hua; Li, H.P.; Cai, Z.H.

doi:10.1016/j.msea.2017.11.112

Cited by 35 publications

(9 citation statements)

References 35 publications

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“…Figure 7 describes the variation law of the mechanical property of H260 and TA2 samples with singlestep pre-strain. With pre-strain increasing, both σ s and σ b of each material increase, and Er decreases gradually, which is consistent with the result of many research works [3,9,19] . Nominal stress and strain cannot reflect the real condition at the large deformation stage, so mechanical property indexes such as true yielding strength σ s-true , ultimate tensile strength σ b-true, and true yield ratio are calculated based on true stress and strain data.…”

Section: Influence Of Pre-strain On Mechanical Propertysupporting

confidence: 91%

“…Therefore, the total elongation rate can be expressed as a sum of the pre-strain and Er of the pre-strained sample [9] . It can be seen from Figure 7(d) that the total elongation rate is quite close at each pre-strain The reason is that the tensile plasticity of pre-strained specimens is reduced by the higher dislocation density, which is consistent with many research works [3,9] . It is reported in reference [20][21] that the total elongation rate of St15 cold-rolled automotive steel and the 5754 aluminum alloy plate increased after they are previously pre-loaded to the strain of 0.17.…”

Section: Eimm-2022mentioning

confidence: 99%

“…Stretching deformation on the pre-strain sample can be considered as two-step loading on the original sample. Therefore, the total elongation rate can be expressed as a sum of the pre-strain and Er of the pre-strained sample [9] . It can be seen from Figure 7(d) that the total elongation rate is quite close at each pre-strain The reason is that the tensile plasticity of pre-strained specimens is reduced by the higher dislocation density, which is consistent with many research works [3,9] .…”

Section: Eimm-2022mentioning

confidence: 99%

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Effect of pre-strain on microstructure and stamping ability of TA2 titanium alloy and H260 low-alloy steel

Liu

Wen

Wang

et al. 2023

J. Phys.: Conf. Ser.

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Applying pre-strain can not only change the microstructure and the mechanical property of metal material but also affect sheet metal stamping ability. In this paper, taking H260 low-alloy steel and TA2 titanium alloy as experimental materials, pre-strain ranging from 0 to 0.16 was applied using the one-step and the multi-step method respectively. Microstructure observation, tensile test, bending test, and cup bulging test were conducted on the pre-strained samples. Results show that in the pre-strain loading stage, the slipping and twinning deformation occurs in the TA2 alloy sample while dislocation sliding mainly happens in H260 low-alloy. With pre-strain increasing, the product of ultimate tensile strength and elongation rate gradually decreases, and the true ultimate tensile stress and accumulating elongation change rarely. The “product of yielding strength and elongation rate” can be enhanced by applying a pre-strain of 0.04 on the condition that plasticity is still at a high level. In the pre-strain range of 0 - 0.16, a bending test with a 30.8 °-opening angle can be completed on H260 steel. The springback angle changes from negative to positive with an increase in pre-strain. The bending ability of TA2 titanium alloy is very poor, for a crack can easily occur even in the original sample. The cupping value decreases gradually with an increase in pre-strain. The cupping value of TA2 titanium alloy is higher than that of H260 low alloy steel for the constant pre-strain. A quite large difference exists between the two experimental materials. Pre-strain loading pass has no significant effect on the microstructure evolution, mechanical properties, and stamping properties.

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Section: Influence Of Pre-strain On Mechanical Propertysupporting

confidence: 91%

Section: Eimm-2022mentioning

confidence: 99%

Section: Eimm-2022mentioning

confidence: 99%

See 1 more Smart Citation

Effect of pre-strain on microstructure and stamping ability of TA2 titanium alloy and H260 low-alloy steel

Liu

Wen

Wang

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…The results of this study support the findings of Steineder et al and De Cooman et al, both of whom suggested that the introduction of a large volume fraction of mobile dislocations due to the formation of athermal martensite was effective at preventing discontinuous yielding in medium manganese steels [14,30]. The prevention of discontinuous yielding through an increase in mobile dislocation density has also been shown effective in studies which utilized pre-straining to increase mobile dislocation density [31]. Other proposed mechanisms for the elimination of discontinuous yielding in medium manganese steels, such as the modification of austenite strength and volume fractions or the sequential deformation of individual phases during yielding, were not found to influence the yielding behavior of the medium manganese steel used in this study, as these factors were held constant between the two sample conditions examined [13,32,33].…”

Section: Role Of Martensite In Yielding Behaviorsupporting

confidence: 89%

Deformation Behavior of a Double Soaked Medium Manganese Steel with Varied Martensite Strength

Glover

Gibbs

Liu

et al. 2019

Metals

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The effects of athermal martensite on yielding behavior and strain partitioning during deformation is explored using in situ neutron diffraction for a 0.14C–7.14Mn medium manganese steel. Utilizing a novel heat treatment, termed double soaking, samples with similar microstructural composition and varied athermal martensite strength and microstructural characteristics, which composed the bulk of the matrix phase, were characterized. It was found that the addition of either as-quenched or tempered athermal martensite led to an improvement in mechanical properties as compared to a ferrite plus austenite medium manganese steel, although the yielding and work hardening behavior were highly dependent upon the martensite characteristics. Specifically, athermal martensite was found to promote continuous yielding and improve the work hardening rate during deformation. The results of this study are particularly relevant when considering the effect of post-processing thermal heat treatments, such as tempering or elevated temperature service environments, on the mechanical properties of medium manganese steels containing athermal martensite.

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“…De Moor et al [23] proposed a model which is used to design the composition of steels and predict the heat treatment temperature. The model suggests that the amount of austenite stabilized at room temperature depends on the content of carbon, aluminum, and manganese alloying elements enriched in austenite [15,16,19]. It further suggests that a temperature exists in the intercritical region that yields the maximum fraction of retained austenite at room temperature.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 93%

Design of an Effective Heat Treatment Involving Intercritical Hardening for High Strength/High Elongation of 0.2C–3Al–(6–8.5)Mn–Fe TRIP Steels: Microstructural Evolution and Deformation Behavior

Mou

Zhang

et al. 2019

Metals

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High strength/high elongation continues to be the primary challenge and focus for medium-Mn steels. It is elucidated herein via critical experimental analysis that the cumulative contribution of transformation-induced plasticity (TRIP) and microstructural constituents governs high strength/high elongation in 0.2C–3Al–(6–8.5)Mn–Fe steels. This was enabled by an effective heat treatment involving a combination of intercritical hardening and tempering to obtain high strength/high ductility. An excellent combination of high ultimate tensile strength of 935–1112 MPa and total elongation of 35–40% was obtained when the steels were subjected to intercritical hardening in the temperature range of 700–750 °C and low tempering at 200 °C. The intercritical hardening impacted the coexistence of austenite, ferrite, and martensite, such that the deformation behavior varied with the Mn content. The excellent obtained properties of the steels are attributed to the cumulative contribution of the enhanced TRIP effect of austenite and the microstructural constituents, ferrite and martensite. The discontinuous TRIP effect during deformation involved stress relaxation, which was responsible for the high ductility. Lamellar austenite, unlike the equiaxed microstructure, is envisaged to induce stress relaxation during martensitic transformation, resulting in the discontinuous TRIP effect.

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The significant impact of pre-strain on the structure-mechanical properties relationship in cold-rolled medium manganese TRIP steel

Cited by 35 publications

References 35 publications

Effect of pre-strain on microstructure and stamping ability of TA2 titanium alloy and H260 low-alloy steel

Effect of pre-strain on microstructure and stamping ability of TA2 titanium alloy and H260 low-alloy steel

Deformation Behavior of a Double Soaked Medium Manganese Steel with Varied Martensite Strength

Design of an Effective Heat Treatment Involving Intercritical Hardening for High Strength/High Elongation of 0.2C–3Al–(6–8.5)Mn–Fe TRIP Steels: Microstructural Evolution and Deformation Behavior

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