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ultrafine grained steels researchgate

ultrafine grained steels researchgate

ultrafine grained steels researchgate

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(PDF) Ultrafine Grained Steels - ResearchGateJul 01, 2002 · PDF | Recent progress in grain refinement of steels was overviewed. After energetic research works since middle 1990's including big national …

Welding of Ultra-Fine Grained Steels | SpringerLink

Abstract. Weldability is an important application property of ultra-fine grained steel. The grain growth and microstructure transformation in the HAZ of ultra-fine grained steel are UltraFine Grained Steels - ResearchGateEqual channel angular pressing of low-carbon steel produces an ultrafine-grained microstructure with an average (sub-)grain size of 325 nm and both coarse and fine carbides, a microhardness of 330 ultrafine grained steels researchgateUS3178324A - Method of producing ultrafine grained steel ultrafine grained steels researchgateUS3178324A US285121A US28512163A US3178324A US 3178324 A US3178324 A US 3178324A US 285121 A US285121 A US 285121A US 28512163 A US28512163 A US 28512163A US 3178324 A US3178324 A US 3178324A Authority US United States Prior art keywords steel heating austenite grain grain size Prior art date 1963-06-03 Legal status (The legal status is an assumption and is not a legal

Thermomechanical processing of advanced high strength

May 01, 2018 · This TMP-treated steel exhibited the highest strength and ductility combination for ultrafine-grained DP steels reported so far in the literature, with UTS of 1371 MPa and uniform elongation of 16%. This TMP method provides a new path for developing bimodal grain size distribution with the aim of obtaining an optimised combination of strength ultrafine grained steels researchgateTensile behavior of ultrafine-grained low ultrafine grained steels researchgate - ResearchGateAn ultrafine-grained (UFG) low-carbon medium-manganese steel was fabricated by the heavily warm rolling (HWR) and subsequent quenching, and the effects of annealing temperatures on microstructure ultrafine grained steels researchgateProcessing of Ultrafine-Grained Steels by ultrafine grained steels researchgate - ResearchGateThe annealed ultrafine grained steel samples exhibit the yield strength in the range of 800-950 MPa, the ultimate tensile strength in the range of 1150-1200 MPa, and total elongation of 12% to 19%.

OPEN ACCESS Related content Fatigue behavior of

materials with an ultrafine grained microstructure [1, 2]. As this effect, however, has not yet been investigated in steels, fatigue experiments of an unalloyed medium carbon steel with a carbon content of 0.45 wt.-%, which was treated by high pressure torsion (HPT) [3 OPEN ACCESS Related content Fatigue behavior of materials with an ultrafine grained microstructure [1, 2]. As this effect, however, has not yet been investigated in steels, fatigue experiments of an unalloyed medium carbon steel with a carbon content of 0.45 wt.-%, which was treated by high pressure torsion (HPT) [3 Microstructure and Mechanical Properties of Ultrafine ultrafine grained steels researchgate316L stainless steel based austenitic oxide dispersion strengthened (AODS) steel was fabricated by mechanical alloying (MA) and hot isostatic pressing (HIP). The AODS sample exhibited an ultrane-grained (UFG) structure with a bimodal grain size distribution (large grains of about 1200 nm and ne grains of about 260 nm).

Microstructure and Mechanical Properties of Ultrafine ultrafine grained steels researchgate

316L stainless steel based austenitic oxide dispersion strengthened (AODS) steel was fabricated by mechanical alloying (MA) and hot isostatic pressing (HIP). The AODS sample exhibited an ultrane-grained (UFG) structure with a bimodal grain size distribution (large grains of about 1200 nm and ne grains of about 260 nm).Microstructure and Fatigue of Ultrafine-Grained Ferritic ultrafine grained steels researchgateSpecific features of the ultrafine-grained structure determined by the X-ray diffraction and transmission electron microscopy studies were used for estimation of dispersion hardening in the ultrafine grained steels researchgateMicrostructure and Deformation Behavior of Phase Materials with submicron to nanometer-sized grains by virtue of their high grain boundary area to grain size ratio provide valuable tools for studying deformation behavior in ultrafine-grained structures. In this regard, the well-known strain-induced martensite transformation and its reversal to the parent austenite phase were used to produce nanograins/ultrafine grains via controlled ultrafine grained steels researchgate

Mechanical behavior of ultrafine-grained eutectoid steel ultrafine grained steels researchgate

Jan 24, 2018 · A eutectoid steel with an ultrafine-grained ferrite () + submicron/Nano-cementite particle () structure was formed by combining warm deformation of martensite to a strain of 0.36 at 0.1 s 1 at 500 °C with subsequent annealing at 500 °C for 6 h.The characteristics of the microstructure were investigated by means of a scanning electronic microscope and transmission electron microscope ultrafine grained steels researchgateMaking ultrastrong steel tough by grain-boundary ultrafine grained steels researchgateJun 19, 2020 · , Inverse temperature dependence of toughness in an ultrafine grain-structure steel. Science 320 , 1057 1060 ( 2008 ). doi: 10.1126/science.1156084 pmid: 18497294 OpenUrl Abstract / Inverse Temperature Dependence of Toughness in an ultrafine grained steels researchgateMay 23, 2008 · Materials are typically ductile at higher temperatures and become brittle at lower temperatures. In contrast to the typical ductile-to-brittle transition behavior of body-centered cubic (bcc) steels, we observed an inverse temperature dependence of toughness in an ultrahigh-strength bcc steel with an ultrafine elongated ferrite grain structure that was processed by a thermomechanical

Friction Stir Welding of Ultrafine Grained IF and Carbon ultrafine grained steels researchgate

ultrafine grained IF steel and carbon steel using a newly developed tool6,7,10-13). The ultrafine grains were made by the accumulative roll-bonding (ARB) processs2,14) or by the new Martensite process15,16). 2. Experimental The materials used in this study were interstitial freeFriction Stir Welding of Ultrafine Grained IF and Carbon ultrafine grained steels researchgateultrafine grained IF steel and carbon steel using a newly developed tool6,7,10-13). The ultrafine grains were made by the accumulative roll-bonding (ARB) processs2,14) or by the new Martensite process15,16). 2. Experimental The materials used in this study were interstitial freeFABRICATION AND TENSILE PROPERTIES OF ULTRAFINE low carbon steel, ultrafine grains, equal channel angular pressing, microalloying, dual phase steel, microstructure, tensile properties INTRODUCTION Severe plastic deformation (SPD) is an effective top-down approach refining grains of metallic materials down to the sub-µm level [1], so-called ultrafine grained (UFG) materials.

FABRICATION AND TENSILE PROPERTIES OF ULTRAFINE

low carbon steel, ultrafine grains, equal channel angular pressing, microalloying, dual phase steel, microstructure, tensile properties INTRODUCTION Severe plastic deformation (SPD) is an effective top-down approach refining grains of metallic materials down to the sub-µm level [1], so-called ultrafine grained (UFG) materials.Enhanced work-hardening behavior and mechanical Oct 01, 2010 · Ultrafine-grained duplex manganese-bearing steels fabricated by quenching and annealing demonstrated excellent combinations of tensile elongation of 3144% and tensile strength of 11.5 GPa and a three-stage work-hardening behavior. Their enhanced mechanical properties and work-hardening behavior were explained by their dynamic composition due to the strain induced phase Effects of Strain Energy and Grain Size on Corrosion ultrafine grained steels researchgateEffect of strain energy and grain size on corrosion resistance of ultrafine grained (UFG) Fe-20%Cr steels with extremely low C and N fabricated by equal channel angular pressing (ECAP) was investigated. UFG structures of initial grain size of 144 nm exhibited the typical three-stage softening comprising recovery, recrystallization, and grain growth.

Effect of Manganese on Grain Size Stability and ultrafine grained steels researchgate

Effect of Manganese on Grain Size Stability and Hardenability in Ultrafine-Grained Dual-Phase Steels For this project two plain carbon steels with varying manganese content (0.87 wt pct and 1.63 wt pct) were refined to approximately 1 um by large strain warm deformation and subsequently subjected to intercritical annealing to produce an ultrafine grained steels researchgateEffect of Manganese on Grain Size Stability and ultrafine grained steels researchgateEffect of Manganese on Grain Size Stability and Hardenability in Ultrafine-Grained Dual-Phase Steels For this project two plain carbon steels with varying manganese content (0.87 wt pct and 1.63 wt pct) were refined to approximately 1 um by large strain warm deformation and subsequently subjected to intercritical annealing to produce an ultrafine grained steels researchgateDeformation Behaviour of Ultrafine Grained Steel Produced ultrafine grained steels researchgateJul 18, 2013 · An ultrafine grained Nb microalloyed steel was produced by cold rolling of martensite followed by annealing heat treatments at different times to study its effect on the microstructure and mechanical behaviour of the ultrafine grained steel.

Cyclic stability of ultrafine-grained interstitial-free ultrafine grained steels researchgate

Mar 15, 2009 · 1. Motivation and significance. Significant attention has been paid to nanocrystalline (NC) and ultrafine-grained (UFG) materials within the last decades , , , , .The grain size varies between 1 nm and 100 nm for the former and falls into the 1001000 nm range in the case of the latter.Bulk Ultrafine-Grained Interstitial-Free Steel Processed ultrafine grained steels researchgateOct 24, 2016 · Grain size can be reduced to ultrafine grain (UFG) range by severe plastic deformation (SPD) techniques (Ref 4, 5, 7-10). UFG steel is several times stronger than its coarse-grained counterpart, but it suffers with low ductility due to restricted dislocation activities in submicron size grained alloys (Ref 4-6).Additive manufacturing of ultrafine-grained high-strength ultrafine grained steels researchgateDec 04, 2019 · Additive manufacturing, often known as three-dimensional (3D) printing, is a process in which a part is built layer-by-layer and is a promising approach for creating components close to their ultrafine grained steels researchgate

Ultrafine-grained microstructures and mechanical ultrafine grained steels researchgate

Abstract. Ultrafine-grained microstructures can be developed in a variety of alloy steels by coldworking followed by annealing in the + region. Because the annealing temperatures are relatively low and the recrystallized structure is two-phase, grain growth is restricted.Ultrafine-grained microstructures and mechanical ultrafine grained steels researchgateUltrafine-grained microstructures can be developed in a variety of alloy steels by coldworking followed by annealing in the + region. Because the annealing temperatures are relatively low and the recrystallized structure is two-phase, grain growth is restricted. Specimens with grain sizes in the range 0.3 to 1.1 .m (ASTM 20 to 16) were obtained in manganese and nickel steels by ultrafine grained steels researchgateUltrafine grain effect on pearlitic transformation in ultrafine grained steels researchgatePearlitic transformation in an ultrafine-grained (UFG) hypereutectoid steel was investigated. The steel was a plain carbon steel containing 1.0 wt% C and very few other elements. The UFG samples were prepared by thermomechanical treatment, and an average grain size of approximately 1

Ultrafine Grained HSLA Steels for Cold Forming

The industrial level production of ultrafine grained (or ultrafine ferrite) ferrous alloys was investigated through three examples of steels that complied with the EN 10149-2 Euronorm and were produced by advanced controlled hot rolling techniques. The steel samples were tension tested and chemically analyzed, and the microstructure was evaluated through quantitative metallographic techniques ultrafine grained steels researchgateUltra-Fine Grained Steels | Springer for Research ultrafine grained steels researchgateThe phenomenon of ultra-fine grain refinement effect by the existing precipitates of nanometer size in the steel produced by using thin slab casting and rolling (TSCR) has been discovered and analyzed. The theory of deformation induced precipitation and medium temperature phase transformation control for bainitic steels has been proposed.Ultra-Fine Grained Steels :: Total Materia ArticleIn general, the term ultrafine grain is used for average grain sizes between 1 m and 2 m in diameter. The term submicron structure refers to grain sizes between 100 nm and 1000 nm; and the term nano-structure means grain sizes below 100 nm. The formation of ultra-fine grained steels is an area of intense research around the world.

Ultrafine grained structure formation in steels using ultrafine grained steels researchgate

The present paper reviews the status of the production of ultrafine grained steels through relatively simple thermomechanical processing. This requires deformation within the Ae 3 to Ar 3 temperature range for a given alloy. Here, the formation of ultrafine ferrite (UFF) involves the dynamic transformation of a significant volume fraction of ultrafine grained steels researchgateUltrafine grained steels managing both high strength In case of commercial steels, the champion value has been 5 µm in the steel plate thermomechanically processed by so-called controlled rolling [1]. On the other hand, it has become recently possible to fabricate the steels with ultrafine grained (UFG) structures of which mean grain size is smaller than 1 m, at least in laboratory scales [2].(PDF) Ultrafine Grained Steels - ResearchGateJul 01, 2002 · PDF | Recent progress in grain refinement of steels was overviewed. After energetic research works since middle 1990's including big national

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