Martensitic transformation and fractographic analysis of lean duplex stainless steel during low temperature tension deformation

Li, Heping; Liu, Bin; Bai, Peikang; Sun, Huer; Li, Dazhao; Sun, Fei; Lin, Naiming

doi:10.1016/j.matchar.2015.07.019

Cited by 17 publications

(6 citation statements)

References 28 publications

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“…Both the previously described deformation mechanisms contribute to the increase of elongation capability of the material; however, Bhadeshia reported that the TRIP effect is responsible for only ≈2% of the total steel deformation. The formation of martensite near the fracture region is restrained by deformation limitations of austenite, which is located between the less soft ferrite lamellae matrix . Furthermore, the increasing of the martensite fraction promotes a gradual reduction of γ into α′ transformation kinetics …”

Section: Discussionmentioning

confidence: 99%

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Tavares

Rodrigues

Santos

2020

steel research int.

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The effect of warm rolling and annealing processes on the microstructure, microtexture, and mechanical properties of a 2205 duplex stainless steel is investigated in this work. To evaluate the microstructure, scanning (SEM) and transmission electron microscopy (TEM) and electron backscatter diffraction are used as the main techniques. The mechanical properties are assessed through tensile tests. A transition from a bamboo type into a pearl structure is observed as the thickness reduction increases. Furthermore, the ferrite phase presents a weakening of the α‐fiber (<011>//rolling direction, RD) and a development of γ‐fiber (<111>//normal direction, ND), whereas the austenite has a reduction in the intensity of the {110}<112> brass component and a strengthening of the {110}<001> Goss and {112}<111> copper components. Multistage work hardening behavior is observed by Jaoul–Crussard analysis, which indicates the presence of secondary deformation mechanisms during the plastic deformation of the steel. Post‐deformation SEM and TEM results reveal the formation of α′ and ε‐martensite at deformed regions. The orientation relationship that develops between γ‐ and ε‐martensite is Shoji–Nishiyama (S–N) <110>γ//<2110>ε.

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Section: Discussionmentioning

confidence: 99%

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Tavares

Rodrigues

Santos

2020

steel research int.

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“…The crack path of tested specimens resulted in a typical brittle quasi-cleavage fracture surface in the ferritic phase, following by induction of microcracks in the austenite grain crossing the ferritic-austenitic boundary. Finally, the crack propagates through the austenite grain [17,18,38,41,45,46]. Challa et al [39] observed a similar behavior in austenitic stainless steels with a nanograins microstructure, and ultrafine grains with an average grain size of 320 nm, associating the deformation mechanism mainly to the deformation twins.…”

Section: Fractography Analysismentioning

confidence: 86%

“…In addition, several microvoids emerged, which are represented in Figure 16 by dark spots or regions. Research works related to the morphology of martensite with the fracture surface found that block martensite tends to generate more microcavities [45,46].…”

Section: Fractography Analysismentioning

confidence: 99%

Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Alves¹,

Rodrigues²,

Santos³

2022

Tecnol. Metal. Mater. Min.

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The deformation mechanism of lean duplex stainless steel (LDSS) is overly complex not only by their dual phase microstructure, but also due to metastable austenite, which can deform by different mechanisms and transform to martensite by strain. The purpose of this study was to investigate the mechanisms of deformation by tensile test on low deformed cold-rolled samples (4%-22%) of a 2304 LDSS. The microstructure was analyzed by X-ray diffraction, optical microscopy, electron backscattered diffraction and transmission electron microscopy. It was observed the formation of mechanical twinning, ε-martensite, and α'-martensite which evidenced the TRIP effect. The strain hardening rate was calculated and analyzed by Holomon and Crussard-Jaoul modeling together with instantaneous strain hardening exponent, and three operating mechanisms were observed: twinning, dislocations slipping, and strain induced martensite formation (SIM). Brass texture had compromised SIM transformation. The fractography analysis of tensile specimens showed quasi-cleavage occurrence, and dimples formation for this range of pre-deformation.

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“…This suggests that the transformation is possible only because of the significant suppression of dynamic recovery at the cryogenic temperature. [26][27][28] Thus, during the process of deformation, large amounts of dislocations and stacking faults are formed followed by the nucleation and growth of strain-induced martensite. Furthermore, the large strain applied during various levels of deformation leads to the continuous generation of twins followed by interaction between different orientation twins, which provides a large number of locations for the nucleation and continuous growth of martensite.…”

Section: Discussionmentioning

confidence: 99%

Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel

Zhou

Xiong

Zha³

et al. 2020

Adv Eng Mater

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Thermomechanical deformation is one of the most efficient and facile routes to tailor microstructure in structural materials for mechanical property enhancement. Herein, the Ce‐modified SAF2507 super duplex stainless steel (Ce‐SAF2507) is deformed at different levels from 30% to 90% at a cryogenic temperature (–196 °C) to achieve superior mechanical performances. Cryogenic rolling increase fiber texture and induce ultra‐fine grain refinement which brings grains to ≈10 nm in the selected steel. The high‐density dislocations and deformation twins in the cryogenically rolled Ce‐SAF2507 lead to the nucleation and growth of martensite. Increases in the martensite volume fraction and nanoscale grain refinement occur at higher deformation levels. Cryogenically rolled deformation results in the overall increase in the Ce‐SAF2507 hardness. A higher hardness increment of austenite–martensite dual‐phase compared to that of ferrite is attributed to the austenite–martensite's higher work hardening ability. Furthermore, the ultimate tensile strength and yield strength increase with the deformation level, but the elongation decrease. Observed microstructural evolutions induced by cryogenic rolling enunciate the superiority of the present method over conventional ones to promote steel’ mechanical properties.

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Martensitic transformation and fractographic analysis of lean duplex stainless steel during low temperature tension deformation

Cited by 17 publications

References 28 publications

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel

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