Retained austenite thermal stability in a nanostructured bainitic steel

Avishan, Behzad; García‐Mateo, C.; Yazdani, S.; Caballero, Francisca G.

doi:10.1016/j.matchar.2013.04.015

Cited by 52 publications

(24 citation statements)

References 34 publications

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“…Selected TEM micrographs are presented in Fig. 3 depicting not only the scale of the microstructure but also the intense dislocation debris evident in both bainitic ferrite and high carbon retained austenite which has been also shown by the authors before for the same steels 54 . Moreover, Fig.…”

Section: Detailed Microstructural Characterizationsupporting

confidence: 68%

Characterisation of microstructure and mechanical properties in two different nanostructured bainitic steels

Avishan¹,

Yazdani²,

Caballero³

et al. 2015

Materials Science and Technology

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Recently, valuable combinations of mechanical properties with strength of 1.9 GPa accompanied by very decent ductility of 19 % and toughness of 31 J, have been achieved in a set of nanostructured bainitic steels. However, it is necessary to elucidate the significance of various microstructural features responsible of that extraordinary mechanical response in more detail.Thus, using two steels, with different Mn, Ni and V contents, and changing the nanostructured bainite isothermal transformation temperatures (200-300 ºC), has led to a plethora of subtle and essential microstructural variations, necessary to explain how the mechanical response of nanostructured bainite is attained.

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Section: Detailed Microstructural Characterizationsupporting

confidence: 68%

Characterisation of microstructure and mechanical properties in two different nanostructured bainitic steels

Avishan¹,

Yazdani²,

Caballero³

et al. 2015

Materials Science and Technology

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“…X-ray diffraction measurements were performed by means of a Bruker AXS D8 diffractometer equipped with a Co X-ray tube and Goebel mirror optics to obtain a parallel and monochromatic X-ray beam. Operational parameters and the procedure for obtaining the austenite content and composition are described elsewhere [22,23].…”

Section: Resultsmentioning

confidence: 99%

Tensile Ductility of Nanostructured Bainitic Steels: Influence of Retained Austenite Stability

Sourmail

García‐Mateo

Caballero

et al. 2017

Metals

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High silicon (>1.5%) steels with different compositions were isothermally transformed to bainite at 220 and 250 • C to produce what is often referred to as nanostructured bainite. Interrupted tensile tests were carried out and the retained austenite was measured as a function of strain. Results were correlated with tensile ductility. The role of retained austenite stability is remarkably underlined as strongly affecting the propensity to brittle failure, but also the tensile ductility. A simple quantitative relationship is proposed that clearly delimitates the different behaviours (brittle/ductile) and correlates well with the measured ductility. Conclusions are proposed as to the role of retained austenite fraction and the existence of a threshold value associated with tensile rupture.

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“…For the long isothermal treatment, several thermal activated processes are expected to appear in the same fashion as in tempering routines, i.e., dislocations networks restoration, C diffusion, and even precipitation. 8,25,26 After isothermal heat treatment, the samples were air cooled to room temperature. Formation of martensite during quenching was completely suppressed due to the carbon partition into retained austenite.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Morales-Rivas

Yen

Huang

et al. 2015

JOM

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The present work is concerned with the study of the relationship between microstructure and ductility of nanostructured bainite. The tensile behavior of two steels treated at the same temperature during different times has been analyzed. Special attention has been paid to the role that the retained austenite mechanical stability plays in enhancing the ductility through its contribution to the work-hardening and the damage resistance of these materials. The results have shown that the relative mechanical properties of the phases present affect both the martensitic transformation behavior and the total elongation.

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Retained austenite thermal stability in a nanostructured bainitic steel

Cited by 52 publications

References 34 publications

Characterisation of microstructure and mechanical properties in two different nanostructured bainitic steels

Characterisation of microstructure and mechanical properties in two different nanostructured bainitic steels

Tensile Ductility of Nanostructured Bainitic Steels: Influence of Retained Austenite Stability

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

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