Patent
Method for producing ultra fine-grained microstructure in ferrous alloys
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TLDR
In this article, a martensitic or bainitic alloys containing up to about 25 percent Ni, 15 percent Mn, 1.2 percent C, 0.5 percent N are cooled to remove the principal nucleating effect of the prior austenite boundaries and other microstructural interfaces, so that when subsequently heated into the multiphase region, recrystallization occurs by random nucleation of extremely fine austenitic crystals thoughout the material.Abstract:
Ferrous alloys containing up to about 25 percent Ni, 15 percent Mn, 1.2 percent C, 0.5 percent N are cooled to form a martensitic or bainitic structure. The material is then worked to an extent sufficient to remove the principal nucleating effect of the prior austenite boundaries and other microstructural interfaces, so that when subsequently heated into the multiphase region, recrystallization occurs by random nucleation of extremely fine austenite crystals thoughout the material. Exceptionally fine equiaxed grains in the micron and submicron range are achieved, thereby providing unique combinations of both increased strength along with increased ductility and increased notch toughness.read more
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Strain-induced transformation to ultrafine microstructure in steel
TL;DR: In this paper, the transformation from one which normally proceeds with grain boundary nucleation followed by intragranular nucleation at deformation bands and other defects, to one which induces a substantially instantaneous transformation homogeneously over the austenite grain.
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Interstitial free steels and method thereof
TL;DR: In this article, the strength of interstitial free steels is increased by up to 100% and the ductile to brittle transition temperature is decreased by upto 100° C. by warm finish rolling in the single phase ferrite region below A rl to effect ferrite dynamic recrystallization of the steel microstructure to a ferrite structure of grain size having a grain size of up to 5 μm.
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High performance nanostructured materials and methods of making the same
Ev Ma,Yinmin Wang,Mingwei Chen +2 more
TL;DR: In this article, a nanostructured metal or alloy is prepared by providing a metallic material, deforming the metallic material to form a plurality of dislocation cell structures, annealing the material at a temperature from about 0.3 to 0.7 of its absolute melting temperature, and cooling the annealed metallic material.
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System and method for annealing nuclear fission reactor materials
Charles E. Ahlfeld,John Rogers Gilleland,Roderick A. Hyde,David G. Mcalees,Jon D. Mcwhirter,Ashok Odedra,Clarence T. Tegreene,Joshua C. Walter,Kevan D. Weaver,Charles Whitmer,Lowell L. Wood,George B. Zimmerman +11 more
TL;DR: In this article, the authors provide systems, methods, apparatuses, and applications related to annealing nuclear fission reactor materials, and demonstrate how they can be used in a variety of applications.
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High-hardness, highly ductile ferrous articles
TL;DR: In this paper, the article is converted to at least 60% bainite, and the balance substantially converted to martensite by quenching; the articles are then cold worked, preferably by both compression and tensile deformation, to achieve at most 60% yield strength.
References
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Method of processing steel
TL;DR: In this article, the authors describe the process of heat-treating steel, where the starting material may be in the hot-rolled condition, or may have been heattreated to improve its ductility.
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