the analysis of phase transformation of undercooled

the analysis of phase transformation of undercooled
DIN 17100 St37-2

The analysis of phase transformation of undercooled ...

Feb 01, 2015 · The analysis of phase transformation of undercooled austenite and selected mechanical properties of low-alloy steel with boron addition - ScienceDirect. Archives of Civil and Mechanical Engineering. Volume 15, Issue 2, February 2015, Pages 308-316.Cited by: 10Publish Year: 2015Author: B. Łętkowska, R. Dziurka, P. Bałasp.info The analysis of phase transformation of undercooled ...The paper presents continuous cooling transformation (CCT) diagram of selected low-alloy boron steel with high resistance to abrasion. Tests were performed on samples with dimensions of Ø 3 mm × 10 mm. Samples were prepared from examined material in as - delivery conditions, then were austenitized at 930 °C for 20 min, and then cooled with the rates of V800-500 = …Cited by: 10Publish Year: 2015Author: B. Łętkowska, R. Dziurka, P. Bałasp.info The analysis of phase transformation of undercooled ...The analysis of phase transformation of undercooled austenite and selected mechanical properties of low-alloy steel with boron addition August 2014 Archives of Civil and Mechanical Engineering 15(2)sp.info The analysis of phase transformation of undercooled ...The analysis of phase transformation of undercooled austenite and selected mechanical properties of low-alloy steel with boron addition Łetkowska, B. Dziurka, R.Cited by: 10Publish Year: 2015Author: B. Łętkowska, R. Dziurka, P. Bała

(PDF) Kinetics of phase transformations of undercooled ...

An essential factor allowing to develop the proper heat treatment is the knowledge of the kinetics of phase transformations of undercooled austenite and its relating to …Estimated Reading Time: 7 minssp.info Kinetics of phase transformations of undercooled …the kinetics of phase transformations of undercooled austenite and its relating to technological conditions, being at the producer disposal, as well as to forging dimensions. Such investigations should be carried out on real melts used for forgings for toothed wheels productionsp.info Kinetics of phase transformations of undercooled austenite ...An essential factor allowing to develop the proper heat treatment is the knowledge of the kinetics of phase transformations of undercooled austenite and its relating to technological conditions, being at the producer disposal, as well as to forging dimensions.sp.info (PDF) The Phase Transformations in Hypoeutectoid Steels …The analysis of the kinetics of phase transformations of undercooled austenite of steels containing different amounts of alloying elements in their …

Widmannstätten laths in Ti48Al2Cr2Nb alloy by undercooled ...

Sep 01, 2015 · Undercooling in solid state phase transformation (ΔT s) (α → γ w) has been clearly distinguished from the melt undercooling (ΔT) below the liquidus temperature (L → β) in Fig. 1(a). Fig. 1 (b) presents that with undercooling increasing, Δ t pl increases first and then decreases, and Δ t pl (8.2–15.4 s) is longest at moderate undercoolings.sp.info In situ observation of solidification of undercooled ...Jul 01, 2013 · Solidification of undercooled Ni–3.3 wt% B alloy melt was investigated by glass fluxing. If Δ Te < 140 ± 10 K, two recalescences appear, indicating that stable eutectic reaction occurs; if Δ Te ≥ 140 ± 10 K, three recalescences can be observed, indicating that metastable eutectic reaction occurs. Analysis indicates that the phase fractions of the as-solidified …sp.info Phase Selection in Undercooled Ni-3.3 Wt Pct B Alloy Melt ...Request PDF | Phase Selection in Undercooled Ni-3.3 Wt Pct B Alloy Melt | The change of eutectic solidification mode in undercooled Ni-3.3 wt …sp.info Microstructure Evolution in Undercooled Ni-Si Melt ...Upon non-equilibrium solidification, the intrinsic parameters, such as moving velocity, temperature, solute partition coefficient, and liquid and solid concentrations at the interface, deviate from their equilibrium characteristics, and the morphology of the as-solidified structure and the grain size are influenced by the non-equilibrium liqulid/solid transformation, which further …

Metastable phase formation in undercooled eutectic Ni78 ...

Nov 01, 1999 · Direct evidence for metastable phase formation could be inferred from in-situ observation of growth kinetics of bulk undercooled melts, which can display multi-step recalescence. The identification of metastable phases in bulk as-solidified samples, e.g. by X-ray techniques, is difficult because of their decomposition on slow cooling.sp.info Measurement of Continuous Cooling Transformation …Mar 25, 2021 · The continuous cooling transformation curve of undercooled austenite is also called CCT curve. It can be used as the basis for the analysis of austenite transformation and microstructure and properties of transformation products in continuous cooling process, and also as an important reference for the formulation of heat treatment process of steelsp.info The influence of carbon content on the kinetics of phase ...Purpose: Present work corresponds to the research on the kinetics of phase transformation of undercooled austenite of three Cr-Mn-Mo models alloys with a different carbon content.sp.info Multi-transformations in rapid solidification of highly ...Oct 09, 2015 · For moderate initial undercooling (Δ T p = 75 K), the solidification interface for primary phase transformation manifests a shape of a planar dendrite, and possesses an constant growth velocity, for eutectic transformation whereas the interface presents multi-dendrite shape and spasmodic growth, so that a constant velocity cannot describe the interface exactly. …

Nonequilibrium effects of primary solidification on ...

Jan 31, 2011 · It was found that when the initial melt undercooling (Δ T) is smaller than 130 K, the overall thickness of the peritectic phase formed in peritectic reaction (PR) and peritectic transformation (PT) decreases as Δ T increases. The nonequilibrium effects of the primary solidification on PR and PT in the undercooled peritectic Fe–Ni alloys were illuminated.sp.info Effects of an ultra-high magnetic field up to 25 T on the ...Phase transformations in undercooled Co-B alloy under 25T magnetic field are studied. • The 25T magnetic field has little effect on homogeneous nucleation. • Magnetic field affects heterogeneous nucleation by modifying the wetting angle. • Decompostion of Co 23 B 6 phase is effectively inhibited by applying 25T magnetic field.sp.info Solidification and melting of high temperature materials ...Dec 20, 2011 · Such a double recalescence event is an indication of the formation of the metastable phase β m, which is rapidly decomposed into the stable α, as it was previously suggested from the microstructure analysis of undercooled samples . These observations are consistent with the nucleation theory, which predicts a lower energy barrier for nucleation of …sp.info In situ observation of solidification of undercooled ...In addition, the transition from stable phase to metastable phase occurs upon undercooled solidification of Ni–Ni 3 B alloy. Reference Xu, Liu and Dang 12 Our previous study has shown that a competitive nucleation between Ni 23 B 6 and Ni 3 B leads to a critical undercooling (125 K < ΔT* < 157 K), for the metastable/stable eutectic formation.

Retained free energy as a driving force for phase ...

Nov 19, 2018 · In the limit, free energy is conserved during growth of the metastable phase and is hereafter assumed to be retained to drive the subsequent transformation by augmenting volume free energy from ...sp.info Direct observation of phase transformation layers in the ...Jul 01, 2000 · The primary phase β in 0 K<∆ T <36 K , the primary phase α in 36 K<∆ T <120 K , and the primary phase γ in 120 K<∆ T <250 K were determined by microstructure analysis. The transient nucleation theory was adopted to explain the phase evolution relationship in the undercooled melt on the consideration of the competing phase with the ...Cited by: 10Publish Year: 2000Author: Y.C Liu, X Lin, X.F Guo, G.C Yang, Y.H Zhousp.info STUDIES OF NUCLEATION AND GROWTH, SPECIFIC …ESL undercooling studies was to explore whether the i-phase may become the primary crystallizing phase from the undercooled liquid, if the nucleation of β(Ti/Zr) and the C14 Laves phases were avoided. One interesting feature of the phase diagram is the existence of an eutectic phase around 21 at.% Ni composition. Below the eutectic temperature, Tisp.info Dynamic Analysis of Recalescence Process and Interface ...Mar 12, 2018 · Using the JMAK equations for a two-dimensional system in combination with a Dirac function, the transformation fraction f of liquid phase can be given as follows: ... phase and deeply undercooled irregular ... C. Bos, and E.J. Mittemeijer, Analysis of Solid State Phase Transformation Kinetics: Models And Recipes, Int. Mater. Rev., 2007, 52 ...

Effects of liquid separation on the microstructure ...

Aug 10, 2012 · For samples undercooled by 62, 79 and 105 K, grain refinement occurs and becomes more serious without the occurrence of liquid separation and peritectic transformation. In contrast, metastable liquid demixing occurs upon the undercooling reaching 125 K, and it proceeds completely with the further increase of undercooling to 188 and 220 K, which ...sp.info Experimental determination and molecular dynamics ...Oct 21, 2008 · The experimental result, 39.54 J mol −1 K −1, is in good agreement with the calculated value of 38.03 J mol −1 K −1, and there exists only a little difference between them. The calculated undercooling range of 0 ∼ 623 K is much wider than the experimental range of 0 ∼ 218 K. The undercooled liquid structure of this alloy is analyzed according to the total and …sp.info MICROGRAVITY STUDIES OF LIQUID-LIQUID PHASE …Jan 31, 2004 · Liquid phase transitions can occur in undercooled melts by a diffusionless process. 2. Onset of the liquid phase transition is accompanied by a large change in the ... Analysis of Single and Two-phase Glasses: ... appears that a polyamorphic transformation of the matrix glass phase occurs together with thesp.info Nucleation and phase selection in undercooled Fe-Cr-Ni ...Feb 01, 1997 · Nucleation and phase selection in undercooled Fe-Cr-Ni melts. Part 1: Theoretical analysis of nucleation behavior Part 1: Theoretical analysis of nucleation behavior Full …

Pulsed laser-induced melting of intermediate Cu-Zn phases ...

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