Deformation behaviour of high-manganese steel with addition of niobium under quasi-static tensile loading

Jabłońska, Magdalena; Jasiak, Katarzyna; Kowalczyk, Karolina; Bednarczyk, I.; Skwarski, Mateusz; Tkocz, M.; Gronostajski, Z.

doi:10.2478/msp-2022-0029

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…According to ref. [34], even an increase of the strain rate from 0.001 to 0.5 s −1 results in the increase of the sample temperature from 40 up to 100 °C in the necking region. The change of RA stability can increase the necessary strain limit for the TRIP effect to occur or even stop the transformation resulting in a decrease of mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Morawiec

Grajcar

Krawczyk

et al. 2023

steel research int.

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The comparison of the dynamic mechanical behavior and microstructure of two medium manganese sheet steels (3Mn–Al and 5Mn–Al) alloyed with aluminum is aimed. Mechanical properties under dynamic tensile loads are determined by means of rotary hammer dynamic tests at strain rates of 250 and 1000 s−1 and analyzed together with the results of static tensile test. It is found that the results are significantly affected by the variations in Mn content in the range from 3 to 5 wt%. In both steels, the tensile strength increases with increasing strain rate, but the variation in the strain rate range has a moderate effect on mechanical behavior. The highest ultimate tensile strength of 1475 MPa is measured in the 5Mn–Al steel, whereas the 3Mn–Al steel is characterized by better total elongation due to a larger fraction of retained austenite and more pronounced transformation‐induced plasticity effect. The results show that the mechanical properties of 3Mn steel are more strain rate sensitive than those of 5Mn steel. The microstructural features are characterized qualitatively and quantitatively by X‐ray diffraction, scanning electron microscopy, and electron back‐scattered diffraction techniques.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Morawiec

Grajcar

Krawczyk

et al. 2023

steel research int.

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“…The temperature changes in the sample tested at the lower strain rate were recorded by FLIR T840 thermal imaging camera. Temperature measurement methodology during quasi-static tensile tests was presented in [13]. The numerical modelling of quasi-static and dynamic tensile tests were performed in Forge NxT 3.2 -a commercial finite element method software dedicated for metal forming and heat treatment simulations.…”

Section: Methodsmentioning

confidence: 99%

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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“…The effects of these metallurgical phenomena are often manifested in melt flow curves [8]. The influence of strain rate and temperature on microstructural changes was also observed [9,10].…”

Section: Introductionmentioning

confidence: 99%

Metallographic Evaluation of Increased Susceptibility to Intermediate Embrittlement of Engine Valve Forgings Made of NCF 3015 High Nickel and Chromium Steel

Lachowicz,

Zwierzchowski,

Hawryluk

et al. 2023

Materials

Self Cite

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This paper focused on determining the increased tendency of cracking after the die forging process of high nickel and chromium steel. The increase in carbon content in austenitic nickel–chromium steel promoted the tendency of valve forgings to forging intergranular crack on the valve head. Attention was paid to issues related to the chemical composition of the material to be considered when hot forming nickel–chromium steel components. Optical and scanning electron microscopies were used to examine the microstructure and fracture features of the samples removed from a fractured valve head. The embrittlement was due to microcavity formation at grain boundaries. Creep theory at grain boundaries was used to explain crack formation. The tensile behavior was interpreted from the evolution of the microstructure during deformation and referred to intermediate brittleness to explain the effect of carbon. It was found that the increased carbon content of the nickel–chromium steel and the strong undercooling observed at the edges of the valve head are factors that promote a reduction in grain boundary cohesion and enhance intermediate temperature embrittlement. Finally, it was found that the formation of a heterogeneous structure manifested by the presence of grain boundary M23C6-type carbides in the austenitic matrix was most likely related to the occurring brittleness.

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Deformation behaviour of high-manganese steel with addition of niobium under quasi-static tensile loading

Cited by 13 publications

References 24 publications

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

Microstructure and Dynamic Mechanical Behavior of Thermomechanically Rolled 3Mn–Al and 5Mn–Al Sheet Steels

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

Metallographic Evaluation of Increased Susceptibility to Intermediate Embrittlement of Engine Valve Forgings Made of NCF 3015 High Nickel and Chromium Steel

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