Topic
Acicular ferrite
About: Acicular ferrite is a research topic. Over the lifetime, 1824 publications have been published within this topic receiving 28025 citations.
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01 Jan 1982
TL;DR: In this article, the authors studied the effects of alloying elements in iron-carbon alloys and the formation of martensite, bainite reaction and acicular ferrite reaction.
Abstract: Iron and its interstitial solid solutions * The strengthening of iron and its alloys * The iron-carbon equilibrium diagram and plain carbon steels * The effects of alloying elements in iron-carbon alloys * Formation of martensite * The bainite reaction * Acicular ferrite * The heat treatment of steels - hardenability * The tempering of martensite * Commercial Steels: New material to include Nanostructured Steels, Steels for the Energy and Automobile Industries * The embrittlement and fracture of steels * Stainless steel * Weld microstructures * Modelling of microstructure and properties *
1,613 citations
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TL;DR: The mechanism of the bainite transformation in steels is reviewed in this paper, with a summary of the early research and concluding with an assessment of the transformation in the context of the other reactions which occur as austenite is cooled to temperatures where it is no longer the stable phase.
Abstract: The mechanism of the bainite transformation in steels is reviewed, beginning with a summary of the early research and finishing with an assessment of the transformation in the context of the other reactions which occur as austenite is cooled to temperatures where it is no longer the stable phase. The review includes a detailed account of the microstructure, chemistry, and crystallography of bainitic ferrite and of the variety of carbide precipitation reactions associated with the bainite transformation. This is followed by an assessment of the thermodynamic and kinetic characteristics of the reaction and by a consideration of the reverse transformation from bainite to austenite. It is argued that there are useful mechanistic distinctions to be made between the coherent growth of ferrite initially supersaturated with carbon (bainite), coherent growth of Widmanstatten ferrite under paraequilibrium conditions, and incoherent growth of ferrite under local equilibrium or paraequilibrium conditions. The nature of the so-called acicular ferrite is also discussed.
1,162 citations
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TL;DR: In this article, the authors examined acicular ferrite, bainite, and martensite microstructures observed in three low-alloy steels and used electron backscattering diffraction (EBSD) to assess crystallographic features.
Abstract: This study deals with acicular ferrite, bainite, and martensite microstructures observed in three low alloy steels. Electron backscattering diffraction (EBSD) was used to assess crystallographic features of these microstructures. In each area studied by EBSD mapping, ‘crystallographic packets’ defined as clusters of points sharing the same crystallographic orientation were compared with ‘morphological packets’ observed in the corresponding light micrograph. Microtexture studies suggested that acicular ferrite and upper bainite grow with Nishiyama– Wassermann relationships with the parent austenite phase, whereas lower bainite and martensite consist of highly intricate packets having Kurdjumov–Sachs relationships with the parent phase. In all cases three highly misoriented texture components were found within each former austenite grain. Electron backscattering diffraction also gave information about the cleavage and intergranular reverse temper embrittlement fracture mechanisms of these steels. In...
399 citations
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TL;DR: In this paper, a modified ISO17081(2004) standard method is used to evaluate the hydrogen trapping by measuring the permeability (JssL) and apparent diffusivity (Dapp).
313 citations
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TL;DR: In this paper, the nature of the fine interlocking acicular ferrite microstructure in HSLA steel weld metals is investigated and it is shown that the active nucleation sites for this ferritic product are weld metal inclusions.
Abstract: In this paper, the nature of the fine interlocking acicular ferrite microstructure in HSLA steel weld metals is investigated The results strongly suggest the acicular ferrite is comprised of intragranularly nucleated Widmanstatten ferrite Further, it is shown that the active nucleation sites for this ferritic product are weld metal inclusions Sympathetic nucleation then takes place which leads eventually to the fine, interlocking microstructure which is a characteristic of acicular ferrite
299 citations