The Effect of High Strain Rate on Properties and Microstructure of the Fully Austenitic High Mn Steel

Śmiglewicz, A.; Jabłońska, Magdalena; Płachta, A.; Rodak, K.; Michalik, R.

doi:10.4028/www.scientific.net/ssp.246.55

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…Moreover, these steels are extremely sensitive to the strain rate [6]. The studied carried out in [7] proved an influence of the strain rate on the ability to transfer dynamic loads by the TWIP steel, confirming an increase in the impact resistance under the influence of increasing strain rate. The dynamic deformation conditions favors the mechanical twins growth in TWIP steel [8,9].…”

Section: Introductionmentioning

confidence: 78%

Specific behavior of high-manganese steels in the context of temperature increase during dynamic deformation

Jabłońska

2023

Materials Research Proceedings

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Abstract. In recent years, a development of AHSS steels for manufacturing parts for the automotive industry is the observed trend. The high-manganese steels with aluminium and silicon addition, exhibiting twinning induced plasticity (TWIP) effect, are one of the most interesting modern materials, due to their unique combination of both very good strength and great ductility. However, the material behaviour during plastic deformation depends not only on the chemical composition but also on deformation conditions, inter alia, strain rate and temperature. TWIP steels can be used for production of energy-absorbing parts, therefore it is very important to analyse their deformation behaviour at high strain rates. The paper presents the effect of deformation in quasi-static and dynamic conditions on the microstructure of an experimental TWIP steel. The experiments were performed on tensile testing machine and on the flywheel machine. The microstructure was analyzed by optical and scanning transmission electron microscopy. Thanks to the measurements during the quasi-static test and numerical simulations of both tensile tests, the temperature increase was determined in the sample region from which the sections for microstructural studies were taken. It was found that the temperature increase in dynamic conditions can affect the microstructure evolution in the investigated TWIP steel.

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Section: Introductionmentioning

confidence: 78%

Specific behavior of high-manganese steels in the context of temperature increase during dynamic deformation

Jabłońska

2023

Materials Research Proceedings

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“…However, it indicates the existence of a significant dependence between the dynamics of the deformation course and the mechanical properties and structural phenomena accompanying high rates of deformation. There are few publications in the literature that present similar research results and discuss the possibilities of using the obtained databases in the structure design process [22]. This is undoubtedly due to limited access to unique research equipment, lack of experience or purely commercial reasons.…”

Section: Discussionmentioning

confidence: 99%

“…There are no material characteristics available under high-speed deformation conditions above 500 s −1 . The purpose of the work is to present the device and the original test methodology, which will certainly work in both scientific and industrial laboratory conditions [20][21][22][23]. The studies present, intentionally, test results for materials representing steels and nonferrous metal alloys, and they want to take an interest in the new method of environmental specialists of the aerospace (PA4, AZ31) and automotive (STEEL DP and TRIP) industries.…”

Section: Introductionmentioning

confidence: 99%

A New Method of Testing the Dynamic Deformation of Metals

et al. 2021

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This paper presents the characteristics of a modernized rotary hammer equipped with a new measuring system based on strain gauges for recording short-term signals. The stand makes it possible to carry out dynamic tensile and bending tests in the range of linear speed of the exciting element from 5 to 40 m/s. Initial tests of dynamic deformation and structural studies in the form of fractures carried out on a representative group of metallic materials allowed determining the correlation “strain rate–strain structure”. The proposed new methodology of dynamic materials testing is an original achievement of the authors and may be an effective tool for assessing the properties of construction materials under conditions of dynamic deformation. In practice, the test results can be used to design the structures of energy-consuming elements of vehicles and aircraft load-bearing elements subjected to dynamic loads. Having an extensive database of results from dynamic tests will allow verifying the correctness of calculations of the structure with the use of the finite element method.

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“…The TWIP effect is responsible for a range of advantageous properties, such as those which can be used in transport vehicles or military technologies for ballistic shields. The compression behaviour of the TWIP steels was manifested by an excellent combination of strength and ductility as well as with continuous strain hardening to the high strain [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the work hardening rate has an increasing tendency with strain rate. The strain rate effect for the TWIP steel could be described by Johnson-Cook hardening model [12].…”

Section: Introductionmentioning

confidence: 99%

The influence of the heat generation during deformation on the mechanical properties and microstructure of the selected TWIP steels

et al. 2023

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The TWIP (Twinning Induced Plasticity) steels are one of the most promising materials in reducing the weight of vehicles. Despite a lot of research on TWIP steel, there are some issues that are not explained enough. Due to the future use of TWIP steel and the manufacturing of the final part by metal forming, three issues still need to be clarified. The first one, which is the most important, is the increase of the temperature due to the conversion of the deformation work into heat. TWIP steel has a high limit strain, strength and lower conductivity than conventional steel, therefore the heat generation of TWIP steel is greater than for other materials. The second and third issues are combined. They concern the influence of V microadditions on the stress–strain curves, the strain hardening coefficient n and the strain rate sensitivity coefficient m under cold deformation conditions. These properties determine the cold formability of TWIP steels. In the research, two TWIP steels were used with and without V microadditions (MnAl and MnAl-V steel). The special methodology using strain and temperature measurement systems as well as light and scanning electron microscopy (SEM) were applied. Research shows a significant increase of the temperature in the material due to high plastic deformations as well as a high level of yield stress. In the neck area, for the highest strain rate of 0,1 s -1, at the moment of rupture, the temperature reaches more than 200 °C. The difference between the average temperature in the rupture area and the maximum temperature is equal to 100° C. Its high increase can lead e.g. to changes in the deformation mechanism from twinning to dislocation gliding, which is also connected with a worsened workability, and thus also energy consumption of the bodywork elements. MnAl-V steel has better or similar ductility for the deep drawing in comparison to MnAl steel at low strain rates for almost isothermal conditions (constant temperature during deformation). However the MnAl steel has better ductility for the larger strain rates over 0.1 s−1 then there is large heat concentration in a very narrow area for MnAl-V steel. The obtained results are very important from an application point of view. The strain rate sensitivity coefficient m of the steel MnAl has very low, and even negative, values, which can make the production of complicated drawpieces difficult. Higher values of the strain rate sensitivity coefficient are exhibited by steel MnAl-V, i.e. at the level of 0,05, which is almost constant in the whole range of the obtained deformations.

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The Effect of High Strain Rate on Properties and Microstructure of the Fully Austenitic High Mn Steel

Cited by 8 publications

References 9 publications

Specific behavior of high-manganese steels in the context of temperature increase during dynamic deformation

Specific behavior of high-manganese steels in the context of temperature increase during dynamic deformation

A New Method of Testing the Dynamic Deformation of Metals

The influence of the heat generation during deformation on the mechanical properties and microstructure of the selected TWIP steels

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