Tensile behavior of TRIP-aided multi-phase steels studied by in situ neutron diffraction

Tomota, Yō; Tokuda, H; Adachi, Yoshitaka; Wakita, Masashi; Minakawa, Nobuaki; Moriai, Atsushi; Morii, Yukio

doi:10.1016/j.actamat.2004.08.016

Cited by 224 publications

(147 citation statements)

References 7 publications

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“…Numerous studies have 323 focused on understanding the TRIP effect. The most 324 widely accepted interpretation [44][45][46][47] is that not only the 325 total amount of induced martensite is significant, but 326 also the rate of transformation for a given plastic strain 327 and at which point it takes place, are the factors that 328 govern the ductility. The evolution of martensite trans-329 formation shown in Figure 9 demonstrates the validity 330 of this interpretation.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Correlation Between Microstructure and Mechanical Properties Before and After Reversion of Metastable Austenitic Stainless Steels

Fargas

Zapata

Roa

et al. 2015

Metall Mater Trans A

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Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Correlation Between Microstructure and Mechanical Properties Before and After Reversion of Metastable Austenitic Stainless Steels

Fargas

Zapata

Roa

et al. 2015

Metall Mater Trans A

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“…Therefore, several studies were carried out to reveal the deformation behavior of retained austenite in TRIP steels [7][8][9]. Experimental investigations showed that the austenite stability is affected by: (i) the constraining effect from the phases surrounding the retained austenite [10], (ii) the crystallographic orientation of grains with respect to the loading direction [11], (iii) the local carbon concentration in the austenite [12] and (iv) the grain volume of the retained austenite grains [14].…”

Section: Introductionmentioning

confidence: 99%

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

et al. 2012

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Uniaxial straining experiments were performed on a rolled and annealed Si-alloyed TRIP (transformation-induced plasticity) steel sheet in order to assess the role of its microstructure on the mechanical stability of austenite grains with respect to martensitic transformation. The transformation behavior of individual metastable austenite grains was studied both at the surface and inside the bulk of the material using electron back-scattered diffraction (EBSD) and X-ray diffraction (XRD) by deforming the samples to different strain levels up to about 20%. A comparison of XRD-and EBSD-results revealed that the retained austenite grains at the surface have a stronger tendency to transform than the austenite grains in the bulk of the material.The deformation-induced changes of individual austenite grains before and after straining were monitored with EBSD. Three different types of austenite grains can be distinguished that have different transformation behaviors: austenite grains at the grain boundaries between ferrite grains, twinned austenite grains, and embedded austenite grains that are completely surrounded by a single ferrite grain. It was found that twinned austenite grains and the austenite grains present at the grain boundaries between larger ferrite grains typically transform first, i.e. are less stable, in contrast to austenite grains that are completely embedded in a larger ferrite grain. In the latter case, straining leads to rotations of the harder austenite grain within the softer ferrite matrix before the austenite transforms into martensite. The analysis suggests that austenite grain rotation behavior is also a significant contributing factor for enhancement of the ductility.

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“…Although, the strength of steel can be increased by the addition of various alloying elements, the key problem concerning this steel strengthening route is that it reduces the ductility of the steel as well as the bendability and/or stretch formability [7][8][9][10][11][12][13]. In this regard, worldwide as well as local industries have already started to produce high strength thermomechanically treated (TMT) steel bars of various categories.…”

Section: Introductionmentioning

confidence: 99%

Hardened Case Properties and Tensile Behaviours of TMT Steel Bars

Kabir¹,

Islam²

2014

AJME

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Nowadays, high strength steels are getting very popular all over the world for various applications such as in auto body making, machine parts manufacturing, steel structure buildings, concrete reinforcement, etc. In Bangladesh, use of high strength TMT steels bars has got a momentum in the construction of flyovers, bridges and high rise buildings because of its good combination of the required mechanical properties. In this research work, locally produced high strength TMT reinforcing steel bars (20 mm dia.) of two different companies have been investigated. As a part of this research work, at first, details microstructural morphologies of hardened case, transition zone and core of both steels were investigated by optical microscope and they were then photographed. After that, Rockwell hardness was measured on different zones. Tensile tests were also carried by a Universal Testing Machine at room temperature. After tensile tests, details of the fracture modes of the steel bars were studied carefully. The fracture modes were then discussed in terms of chemical compositions and carbon equivalents, resulted microstructures, case and core hardness, depths of hardened case and transition zone of the steel bars.

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Tensile behavior of TRIP-aided multi-phase steels studied by in situ neutron diffraction

Cited by 224 publications

References 7 publications

Correlation Between Microstructure and Mechanical Properties Before and After Reversion of Metastable Austenitic Stainless Steels

Correlation Between Microstructure and Mechanical Properties Before and After Reversion of Metastable Austenitic Stainless Steels

Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel

Hardened Case Properties and Tensile Behaviours of TMT Steel Bars

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