scispace - formally typeset
Search or ask a question
Topic

Bainite

About: Bainite is a research topic. Over the lifetime, 9520 publications have been published within this topic receiving 145305 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the microstructure of the coarse grain heat affected zone (CGHAZ) of an offshore platform steel exhibited a gradual transition from lath bainite/martensite (LB/LM) to granular bainitic (GB) with increasing cooling time.

48 citations

Journal ArticleDOI
TL;DR: In this article, Austenite nucleation and growth is studied during continuous heating using three-dimensional X-ray diffraction (3-D XRD) microscopy at the European Synchrotron Radiation Facility (ESRF) (Grenoble, France).
Abstract: Austenite nucleation and growth is studied during continuous heating using three-dimensional X-ray diffraction (3-D XRD) microscopy at the European Synchrotron Radiation Facility (ESRF) (Grenoble, France). Unique in-situ observations of austenite nucleation and growth kinetics were made for two commercial medium-carbon low-alloy steels (0.21 and 0.35 wt pct carbon with an initial microstructure of ferrite and pearlite). The measured austenite volume fraction as a function of temperature shows a two-step behavior for both steel grades: it starts with a rather fast pearlite-to-austenite transformation, which is followed by a more gradual ferrite-to-austenite transformation. The austenite nucleus density exhibits similar behavior, with a sharp increase during the first stage of the transformation and a more gradual increase in the nucleus density in the second stage for the 0.21 wt pct carbon alloy. For the 0.35 wt pct carbon alloy, no new nuclei form during the second stage. Three different types of growth of austenite grains in the ferrite/pearlite matrix were observed. The combination of detailed separate observations of both nucleation and growth provides unique quantitative information on the phase transformation kinetics during heating, i.e., austenite formation from ferrite and pearlite.

48 citations

Journal ArticleDOI
Manabu Takahashi1
TL;DR: In this article, two different approaches to model the kinetics of the bainite transformation were proposed, one based on a nucleation-controlled model and the other based on the diffusion of substitutional alloying elements.
Abstract: There are two different approaches to model the kinetics of the bainite transformation. The diffusional growth model needs to adopt the solute drag effect, and a quantitative approach is proposed although the diffusion of substitutional alloying elements is not fully accepted experimentally. The nucleation-controlled model based on the displacive and diffusionless nature of the bainite transformation, combined with the kinetics of cementite formation in austenite and in ferrite as the simultaneous reactions.

48 citations

Journal ArticleDOI
TL;DR: In this paper, the significance of various micro-structural features responsible for the extraordinary mechanical response of nanostructured bainite is elucidated in more detail, using two steels, with different Mn, Ni and V contents.
Abstract: 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°C), has led to a plethora of subtle and essential microstructural variations, necessary to explain how the mechanical response of nanostructured bainite is attained.

48 citations

Journal ArticleDOI
Longyun Xu1, Jian Yang, Ruizhi Wang, Yu-Nan Wang, Wanlin Wang1 
TL;DR: In this paper, the effect of Mg content on the microstructure and toughness of steel plates after high heat input welding was investigated by means of welding thermal simulation test and in situ observation through high-temperature laser scanning confocal microscopy.
Abstract: The effect of Mg content on the microstructure and toughness of the heat-affected zone (HAZ) of steel plates after high heat input welding was investigated by means of welding thermal simulation test and in situ observation through high-temperature laser scanning confocal microscopy. It was found that with the increase of Mg content in the steel, the former austenite grain sizes were greatly decreased and the mainly microstructural constituents in HAZ were changed from the brittle constituents of Widmanstatten ferrite, ferrite side plate and upper bainite to the ductile constituents of intragranular acicular ferrite and polygonal ferrite. The proportion of grain boundary ferrite was decreased greatly with the further addition of Mg from 27 to 99 ppm. As a result, the HAZ toughness after welding with heat input of 400 kJ cm−1 is increased with increasing Mg content in the steel plate.

48 citations


Network Information
Related Topics (5)
Alloy
171.8K papers, 1.7M citations
89% related
Microstructure
148.6K papers, 2.2M citations
87% related
Deformation (engineering)
41.5K papers, 899.7K citations
86% related
Grain boundary
70.1K papers, 1.5M citations
84% related
Welding
206.5K papers, 1.1M citations
83% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023211
2022417
2021337
2020425
2019427
2018409