Effect of Strain Rate on the Martensitic Transformation During Plastic Deformation of an Austenitic Stainless Steel

Isakov, Matti; Hiermaier, Stefan; Kuokkala, Veli‐Tapani

doi:10.1007/s11661-015-2862-z

Cited by 33 publications

(21 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the strain-hardening rate (slope of the stress-strain curve) also decreases immediately to a value close to that of the monotonous test. This behavior is expected since the microstructure at this stage is mostly austenitic regardless of the strain rate history [8,9,13,14]. In the jump test after a prestrain of 0.23, the sudden increase of strain rate leads to a behavior similar to that observed in the jump after 0.10.…”

Section: Resultsmentioning

confidence: 71%

“…The phase transformation rate has been observed to decrease immediately after a sudden increase of strain rate, leading to an immediate decrease in the strainhardening rate of the material [13,14]. To further study this effect, the strain rate jumps were performed at 0.10 and 0.23 of true strain, i.e., before and after the large change in the strain-hardening rate observed in the constant low strain rate test.…”

Section: Resultsmentioning

confidence: 99%

“…Materials undergoing a phase transformation have a microstructure that evolves considerably during plastic deformation, and therefore it is crucial to distinguish between the two above mentioned loading rate effects. Following this approach, Isakov et al [13] performed strain rate jump experiments on a metastable austenitic stainless steel, and observed that both the strain-hardening rate and the phase transformation rate decreased instantaneously after the jump. Furthermore, a monotonous low strain rate test revealed a notable increase in the strain-hardening rate at around 0.15 of true strain, in comparison with the high strain rate test, where the strain-hardening rate was more or less constant with respect to the amount of strain.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strain rate jump tests on an austenitic stainless steel with a modified tensile Hopkinson split bar

et al. 2018

Self Cite

View full text Add to dashboard Cite

This paper presents an improved experimental setup for high strain rate testing based on the modified Tensile Hopkinson Split Bar device developed previously at TUT. The test setup can be used to study the effects of a sudden large change in the strain rate on the stress flow of the material. The setup allows deforming the sample at a low rate and at isothermal conditions before the high rate loading. During the strain rate jump, the deformation rate is rapidly increased by approximately six orders of magnitude. In this work, the low and high rate deformation of the specimen was recorded with a combination of low and high-speed digital cameras and analyzed using the Digital Image Correlation technique. The measurement provides information about the effects of the strain rate jump on the macroscopic response of the material and allows accurate observation of the deformation of the sample just before, during, and immediately after the strain rate jump, when the conditions change from isothermal to adiabatic. In this paper, we present the results for a metastable austenitic stainless steel and discuss the effects of the strain rate jump on the strain-hardening rate, compare the experimental results with numerical results from a thermomechanical model, and evaluate the effects of the preceding deformation at a low strain rate on the strain localization. We conclude that the strain rate jump results in a clear decrease in the strain-hardening rate, the deformation following the jump is uniform along the gauge section, and that the strain localization is not significantly affected by the strain rate or the amount of pre-strain in the studied conditions.

show abstract

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strain rate jump tests on an austenitic stainless steel with a modified tensile Hopkinson split bar

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, yield strength is increased in the dynamic case. The tests performed by Yoo et al [40,41] with stainless steel AISI 304 under tension at low strain rates demonstrate that the strain rate has an influence on the global behavior of steel, in particular at low temperatures. This present work is dedicated to the investigation of the TRIP effect in the stainless steel AISI 304.…”

Section: Due To Its Good Mechanical Chemical and Physicalmentioning

confidence: 99%

Metallurgical Phase Transformation and Behavior of Steels Under Impact Loading

Zerouki

Ouali

Benabou

2019

Metall Mater Trans A

View full text Add to dashboard Cite

This study deals with the mechanical behavior of the austenitic stainless steel, AISI 304, under quasi-static and impact loadings. In particular, the evolution of the transformation-induced plasticity (TRIP) is investigated. Several compression tests have been performed at various strain rates under both static and impact conditions (crash tests). In order to show the influence of the strain rate on the phase transformation, the microstructures of as-received and deformed specimens have been observed with a scanning electron microscope. Then, the newly formed ferromagnetic martensitic phase is analyzed with the help of the vibrating sample magnetic (VSM) method and by X-ray diffraction (XRD). The results obtained from the mechanical testing indicate that the TRIP effect is actually occurring since a significant change of the curve slope is visible during the hardening regime in the stress-strain curve. The VSM and XRD techniques, on the other hand, show that the proportion of the martensitic phase is reduced when the strain rate is increased. The quantity of martensite formed is greater when quasi-static loadings are applied to the material.

show abstract

“…Ahmedabadi et al proposed a model to predict the kinetics of martensite formation in 304 austenitic stainless steel as a function of strain. Talonen et al and Isakov have have also investigated the relationships between the strain rate and the kinetics of phase transformation in various metastable austenitic stainless steels. De et al examined phase transformation in 304 austenitic stainless steel as a function of temperature and grain size.…”

Section: Introductionmentioning

confidence: 99%

Influence of Strain State on the Kinetics of Martensitic Transformation Induced Plasticity (TRIP) in AISI 304 Stainless Steel

Mansourinejad

Ketabchi

2018

steel research int.

View full text Add to dashboard Cite

The influence of strain state on the kinetics of martensitic phase transformation in stainless steel 304 is investigated. The methodology involves stretching various specimens with different widths over a hemispherical punch. The specimens are stretched to various depths by controlling the punch traveling in order to achieve different strain levels. The volume fraction of strain induced martensite is then measured using ferrite scope and plotted versus strain for different strain states. The results show that the martensitic transformation curve has the lowest value for plane strain condition among strain states used for determination of forming limit diagram. There are a close proximity between the two sets of the experimental data and those of the modified Olson-Cohen and Santacreu's models.

show abstract

Effect of Strain Rate on the Martensitic Transformation During Plastic Deformation of an Austenitic Stainless Steel

Cited by 33 publications

References 12 publications

Strain rate jump tests on an austenitic stainless steel with a modified tensile Hopkinson split bar

Strain rate jump tests on an austenitic stainless steel with a modified tensile Hopkinson split bar

Metallurgical Phase Transformation and Behavior of Steels Under Impact Loading

Influence of Strain State on the Kinetics of Martensitic Transformation Induced Plasticity (TRIP) in AISI 304 Stainless Steel

Contact Info

Product

Resources

About