Efeito da taxa de aquecimento na reversão da martensita induzida por deformação em um aço inoxidável austenítico do tipo ABNT 304

Santos, Tiago Felipe de Abreu; Andrade, Margareth Spangler; Castro, Ana Luiza Resende de

doi:10.1590/s0370-44672009000100008

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…It is seen that under the present conditions, the reversion occurs over the temperature range of 600 -800 °C. Both the austenite start (A s ) and finish (A f ) temperatures increase slightly with increasing heating rate, as also observed elsewhere [1,13,14]. The A s (i.e., the maxima in the expansion coefficient in Fig.…”

Section: Resultssupporting

confidence: 79%

Studies on Martensite Transformation in a Metastable Austenitic Cr-Mn Stainless Steel

Kisko

Rovatti

Misra

et al. 2013

MSF

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The influences of the heating rate and annealing duration on martensite formation and its reversion to austenite have been investigated in a 60% cold-rolled metastable high-manganese austenitic Type 204Cu stainless steel. A Gleeble 3800 thermomechanical simulator was used for dilatometric measurements. Cold-rolled steel pieces were either heated up to 1000 °C at various heating rates between 5 °C/s and 150 °C/s followed by quenching to room temperature, or heated and held at temperatures in the range of 450 620 °C for different durations between 0.1 600 s. In heating experiments, dilatation curves revealed an expansion of a specimen starting around 550 °C followed by contraction, both processes depending on the heating rate. These dimensional changes could be correlated to the formation and reversion of a ferromagnetic phase, α-martensite. Some martensite was also formed during isothermal holding in connection with tempering of the pre-existing α-martensite before the following reversion, as established by magnetic measurements. Tempering of martensite was revealed by microhardness behaviour, X-ray diffraction analysis and transmission electron microscopy.

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Section: Resultssupporting

confidence: 79%

Studies on Martensite Transformation in a Metastable Austenitic Cr-Mn Stainless Steel

Kisko

Rovatti

Misra

et al. 2013

MSF

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“…[3,20] Both (e fi c, a¢ fi c) transformations are shifted to higher temperatures with the increase of heating rate (at the heating rate higher than 0.1 K/s). [21] Tomimura et al described two types of possible reverse transformation (a¢ fi c) mechanisms: 1st diffusive by nucleation and growth of new austenite grains and 2nd diffusionless shear reversion. [22] The reverse transformation plays a significant role in grain refinement in metastable austenitic stainless steels.…”

Section: Introductionmentioning

confidence: 99%

The Investigation of Strain-Induced Martensite Reverse Transformation in AISI 304 Austenitic Stainless Steel

Cios

Tokarski

Żywczak

et al. 2017

Metall Mater Trans A

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This paper presents a comprehensive study on the strain-induced martensitic transformation and reversion transformation of the strain-induced martensite in AISI 304 stainless steel using a number of complementary techniques such as dilatometry, calorimetry, magnetometry, and in-situ X-ray diffraction, coupled with high-resolution microstructural transmission Kikuchi diffraction analysis. Tensile deformation was applied at temperatures between room temperature and 213 K (À60°C) in order to obtain a different volume fraction of strain-induced martensite (up to~70 pct). The volume fraction of the strain-induced martensite, measured by the magnetometric method, was correlated with the total elongation, hardness, and linear thermal expansion coefficient. The thermal expansion coefficient, as well as the hardness of the strain-induced martensitic phase was evaluated. The in-situ thermal treatment experiments showed unusual changes in the kinetics of the reverse transformation (a¢ fi c). The X-ray diffraction analysis revealed that the reverse transformation may be stress assisted-strains inherited from the martensitic transformation may increase its kinetics at the lower annealing temperature range. More importantly, the transmission Kikuchi diffraction measurements showed that the reverse transformation of the strain-induced martensite proceeds through a displacive, diffusionless mechanism, maintaining the Kurdjumov-Sachs crystallographic relationship between the martensite and the reverted austenite. This finding is in contradiction to the results reported by other researchers for a similar alloy composition.

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“…O primeiro nível de deformação escolhido foi o equivalente a cinco por cento (5%). Esse valor foi proposto conforme Santos, Andrade e Castro (2009), que indica que valores equivalentes a esse nível, são favoráveis à formação da martensita induzida por deformação em aços inoxidáveis austeníticos. Na figura 11, observa-se a presença das fases ferrita e austenita em duas regiões, porém sem evidências de MID.…”

Section: Resultados E Discussõesunclassified

“…Figura 3 -Comparação da fração de martensita induzida por deformação de um aço inoxidável austenítico e dúplex Fonte: Gauss (2015).Figura 4 -Micrografias ópticas das amostras deformadas: (a) três por cento (3%), (b) seis por cento (6%), (c) nove por cento (9%) e (d) doze por cento (12%) de um aço inoxidável AISI 304 Fonte: Santos, Andrade eCastro (2009).…”

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Efeito do grau de deformação na formação de martensita induzida por deformação em uma liga de aço inox dúplex UNS S32205

Silveira¹,

Vieira²,

Medeiros³

et al. 2018

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O objetivo deste trabalho foi avaliar a formação de martensita induzida por deformação (MID), para diferentes graus de deformação em uma liga de aço inoxidável dúplex UNS S32205. Para a realização deste estudo, foram aplicados cinco (5) níveis de deformações, variando-se de cinco (5) a trinta por cento (30%). Posteriormente, as microdurezas e microestruturas foram analisadas, através de microdurômetro, microscópio óptico e eletrônico de varredura, respectivamente. Por análise metalográfica, foi possível identificar a presença de MID em todos os graus de deformação. Um aumento significativo de microdureza ficou evidente nas fases MID, quando comparados com a condição preliminar às deformações.

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Efeito da taxa de aquecimento na reversão da martensita induzida por deformação em um aço inoxidável austenítico do tipo ABNT 304

Cited by 5 publications

References 5 publications

Studies on Martensite Transformation in a Metastable Austenitic Cr-Mn Stainless Steel

Studies on Martensite Transformation in a Metastable Austenitic Cr-Mn Stainless Steel

The Investigation of Strain-Induced Martensite Reverse Transformation in AISI 304 Austenitic Stainless Steel

Efeito do grau de deformação na formação de martensita induzida por deformação em uma liga de aço inox dúplex UNS S32205

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