Effect of reversion of strain induced martensite on microstructure and mechanical properties in an austenitic stainless steel

Ghosh, S. K.; Mallick, P.; Chattopadhyay, Paramita

doi:10.1007/s10853-011-5253-x

Cited by 21 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There are two types of martensite formed sequentially from the austenite (FCC): martensite " (HCP) then martensite˛0 (BCC) [14,21,22]. The volume percent of " martensite compared to˛0 is considered as negligible above approximately 15 % strain [19,23]. In the present study only˛0 martensitic, i.e., the stable phase, was detected by EBSD which is in agreement with the above references since the applied strain in this study is 40 %.…”

Section: Microstructural Analysissupporting

confidence: 89%

“…This finding is in agreement with those reported by other authors. For instance, Ghosh et al [23] mention a residual volume percent of strain induced˛0-martensite after annealing (800 ı C/1h) in an austenitic stainless steel with a composition very similar to the one investigated in the present study. The presence of martensite after the second SR heat treatment in the specimen undergoing the "SR C 40 % C SR" sequence could indicate that 40 % strain corresponds to an excessive deformation level.…”

Section: Microstructural Analysissupporting

confidence: 58%

See 1 more Smart Citation

Improving the Formability of Stainless Steel 321 Through Multistep Deformation for Hydroforming Applications

Anderson

Gholipour

Bridier

et al. 2013

Transactions of the Canadian Society for Mechanical Engineering

View full text Add to dashboard Cite

Tube hydroforming (THF) is a well established process in the automotive industry and its application is being extended to the aerospace for manufacturing complex geometries. However, most of the alloys used in aerospace are high in strength and low in formability, which renders the application of THF more challenging. The objective of this paper is to present a method to increase the formability of an austenitic stainless steel. A multistep forming process was simulated through interrupted uniaxial tensile testing experiments to study the influence of the latter process on formability. The tensile test was divided into several deformation steps with a stress relief heat treatment after each forming step. The results indicated that the application of intermediate heat treatments considerably increased the formability of the stainless steel 321 alloy (SS321). Microstructure evolution as a function of deformation or heat treatment parameters was also investigated and revealed the formation of strain-induced martensite after the first deformation and heat treatment cycle without any deleterious effect on formability enhancement.

show abstract

Section: Microstructural Analysissupporting

confidence: 89%

Section: Microstructural Analysissupporting

confidence: 58%

Improving the Formability of Stainless Steel 321 Through Multistep Deformation for Hydroforming Applications

Anderson

Gholipour

Bridier

et al. 2013

Transactions of the Canadian Society for Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The XRD analysis showed the α and γ phases, as indicated in Figure . As expected, the XRD analysis did not allow the identification of α ′‐martensite owing to the overlap of its peaks with α ; indirectly, however, the technique allowed the detection of α ′‐martensite through an estimation of the phase . Comparing the phase volume fraction between the as‐received and cold rolled samples, it was concluded that the amount of α was increased by 24%.…”

Section: Discussionmentioning

confidence: 99%

Strain‐Induced Martensite and Reverse Transformation in 2304 Lean Duplex Stainless Steel and its Influence on Mechanical Behavior

Maria

Pedroso

Rodrigues

et al. 2018

steel research int.

View full text Add to dashboard Cite

Duplex stainless steels (DSS) combine the mechanical properties of ferrite (α) with the corrosion resistance of austenite (γ), and is widely used in industrial applications. The γ can transform into martensite (SIM) during a deformation. When annealed, these types of steel undergo a reverse transformation, namely, SIM reversed to austenite (SIMRT). The aim of this study is to evaluate SIM and SIMRT in 2304 lean DSS (LDSS) as well as its influence on the mechanical properties after a 60% reduction in thickness. The annealing is conducted within a range of 600–900 °C with a soaking time of 1800s. The samples undergo X‐ray diffraction, EBSD, and a tensile test. The results show that, after cold rolling, the amount of α′‐martensite formed is made up 24%. The α′‐martensite collaborates with the enhanced yield strength and reduces the total elongation. The orientation among γ and α′‐martensite, and (111)γ//(110)α [110]γ//[111] Kurdjumov‐Sachs and (111)γ//(110)α [110]γ//[001]α Nishiyama–Wassermann, is observed after deformation and during the reversion process. The EBSD shows a high misorientation inside the γ after the cold rolling. The SIMRT shows diffusional and shear reversion characteristics, at 900 °C, yield strength is 468 MPa, and the elongation is 32%.

show abstract

“…Nestes estágios iniciais também acontece a formação de bandas de cisalhamento e maclas mecânicas devido à sobreposição sucessiva das falhas de empilhamento nos planos {111} durante a deformação plástica. Por outro lado, a fase ' nucleia-se em sítios preferenciais, tais como interseções de bandas de cisalhamento ou interseções entre martensita ԑ e um plano de deslizamento, contorno de grão ou macla [15][16][17][18][19]. Uma forma de avaliar o efeito TRIP, em termos da ocorrência da transformação como do progresso da mesma, pode ser realizado via nanoindentação, uma vez que esta técnica permite a obtenção de outras propriedades mecânicas além da dureza clássica.…”

Section: Figuraunclassified

Nanoindentação Aplicada Aos Aços Inoxidáveis Austeníticos 304l E 201ln

Silva¹,

Souza²,

Casanova³

et al. 2017

Anais Do Congresso Anual Da ABM

View full text Add to dashboard Cite

Resumo Com o objetivo de avaliar as condições estruturais via comportamento mecânico associada ao efeito TRIP realizou-se estudo comparativo das propriedades mecânicas de dois aços inoxidáveis austeníticos comerciais de graus 304L e 201LN. A martensita induzida por deformação foi formada durante a laminação a frio a temperatura ambiente até percentual de redução de espessura de 80% e avaliada via nanoindentação com cargas máximas de ensaio de 1, 20, 50 e 100 gf. Observou-se que as propriedades decresceram com o aumento das cargas utilizadas e apresentaram tendência de estabilização com as maiores cargas.

show abstract

Effect of reversion of strain induced martensite on microstructure and mechanical properties in an austenitic stainless steel

Cited by 21 publications

References 31 publications

Improving the Formability of Stainless Steel 321 Through Multistep Deformation for Hydroforming Applications

Improving the Formability of Stainless Steel 321 Through Multistep Deformation for Hydroforming Applications

Strain‐Induced Martensite and Reverse Transformation in 2304 Lean Duplex Stainless Steel and its Influence on Mechanical Behavior

Nanoindentação Aplicada Aos Aços Inoxidáveis Austeníticos 304l E 201ln

Contact Info

Product

Resources

About