Thermodynamic assessment of the Fe-Te system. Part II: Thermodynamic modeling

Arvhult, Carl-M; Guéneau, C.; Gossé, Stéphane; Selleby, Malin

doi:10.1016/j.jallcom.2018.07.051

Cited by 13 publications

(17 citation statements)

References 41 publications

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“…In addition, Data of 61 at.% Te from Terzieff. [8] Binary data from Arvhult et al [19,20] [19,20] DTA studies present the liquidus and solidus temperatures for isoplethal sections of 44-80 at.% Te, complementing the work by Terzieff, [8] which only considered 61 at.% Te. Metallographic studies show that the b2 phase forms Widmanstätten structures, precipitated inside the ternary s phase regions, which supports theories that the s phase extends at higher temperature to reach above the b2 phase towards the Fe-Te binary high-temperature rhombohedral phase, [2] also known as b 0 .…”

Section: Discussionmentioning

confidence: 94%

Experimental Phase Diagram Study of the Fe-Ni-Te System

Arvhult

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et al. 2019

J. Phase Equilib. Diffus.

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Fe-Ni-Te alloys have been experimentally studied using isothermal heat treatments with SEM-EDS and WDS, XRD, and DTA in order to add phase diagram data for a thermodynamic assessment. This is for the application of fission product-induced corrosion of the stainless steel cladding of nuclear fuel pins, where Te is a key element. Phase diagram data are presented at 700 and 800 C, together with the solidus and liquidus temperatures from 44 to 80 at.% Te. Metallographic and XRD analysis show that the b2 phase forms as a Widmanstätten structure, preferentially precipitated in the s phase. SEM images show unidentified precipitates in several samples.

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Section: Discussionmentioning

confidence: 94%

Experimental Phase Diagram Study of the Fe-Ni-Te System

Arvhult

Poissonnet

Menut

et al. 2019

J. Phase Equilib. Diffus.

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“…Such associates were already considered by Koza.ke vitch et al [60] to explain the role of sulphur in cast iron melts. They have been aJso seen to be necessary for appropriate thermodynamic de scription of the Fe S [61,62] and Fe Te [63] systems. This suggests that the existence of these associates is the fundamental reason for S and Te to preferentially adsorb on basal planes.…”

Section: These Calculations Thus Support the Suggestion Made Above Thmentioning

confidence: 99%

Effects of impurities on graphite shape during solidification of spheroidal graphite cast ions

2019

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This is an author's version published in: http://oatao.univ-toulouse.fr/25345 To cite this version:Lacaze, Jacques and Connétable, Damien and Castro-Román, Manuel Jesus Effects of impurities on graphite shape during solidification of spheroidal graphite cast ions. (2019) Materialia, 8. 100471. ARTICLE INFO ABSTRACT Keyword.s: Cast iron Solidification microstructure Graphite morphology Graphite degeneracy DFTSince the discoveiy that magnesium and cerium (and more generally rare earths) added at low level to cast iron melts lead to spherodized graphite, it is lmown that some other elements are detrimental even when present as traces. In ail practicality, it bas soon been recogniz.ed that adding rare earths to the melt helps counteracting the effect of these detrimental elements. Accordingly, only few works have been devoted to studying the effect of trace elements in melts without any rare earths. This is the first aim of the present work to review those studies as they contain the material to understand the mechanism for spheroidal graphite degeneracy. From this review, three types of degeneracy have been defined which show up when the critical level of any particular element is exceeded. These results are then discussed to show that ail degeneracies certainly proceed in the same way. To substantiate this discussion, the growth of compacted graphite as obtained by low level treatrnent of cast iron melt with magnesium is also presented. Finally, a mechanism is suggested for describing the action of trace elements on spheroidal graphite degeneracy. This mechanism is partly substantiated by first principles calculations which showed that ail elements can strongly adsorb on the prismatic planes which are the planes on which carbon atorns add on during graphite growth. • Corresponding author. E-mail address: jacques.lacaze@ensiacet.fr (J. Lacaze). scription of the impurity effect without RE addition, i.e. concerned with describing and understanding this effect The impurities listed in the patent [4] are As, Bi, Pb, Sb, Se, Sn and Te, and it is worth stressing that most of them are also harmful to non spheroidized lamellar graphite iron melts as reviewed by Rey naud [7]. In an extensive study aimed at controlling the charges for melt preparation, Thielemann [8] proposed the following quality index S b for spheroidal graphite cast irons where Al and Ti appear but not Se and Te which were not considered: S b = 1.6 • w Al+ 2. 0 · w A s + 3 70 · We; + 2 90 · WPb + 5 . 0 · Wsb +2.3 . Wsn +4.4 . WTi (1) in which W; is the weight fraction of i element in the charge used for preparing the melt This quality index has been obtained with spheroidal graphite cast irons containing 0.04 to 0.08 wt. % Mg that were cast with wall thickness in between 8 and 45 mm. When S., is lower than 1 no action is necessary while if it is higher RE should be added to avoid spheroidal graphite degeneracy.What is seen in the Thielemann's factor and which reflects foundry practic e is that bismuth and lead have a much higher coefficient than the other ...

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“…The phase diagrams and thermodynamic interactions between the major alloying elements (Cr, Fe, Ni) and Te were studied by numerous authors: Cr-Te [14]- [16], Fe-Te [17]- [20] and Ni-Te [21] [22].…”

Section: Thermodynamic Considerationsmentioning

confidence: 99%

Corrosion of 316L in liquid tellurium at 551°C

et al. 2019

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Grade 316L stainless steel was exposed to liquid tellurium at 551 o C. Corrosion was rapid, leading to more than 100 m loss of steel section in 30 min. The corrosion product was a mixed telluride scale, which thickened according to parabolic kinetics whilst simultaneously dissolving at its outer surface into the liquid tellurium. A mathematical model based on diffusion-controlled scale growth coupled with dissolution at a rate controlled by liquid phase diffusion is shown to describe scaling and dissolution kinetics successfully.

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Thermodynamic assessment of the Fe-Te system. Part II: Thermodynamic modeling

Cited by 13 publications

References 41 publications

Experimental Phase Diagram Study of the Fe-Ni-Te System

Experimental Phase Diagram Study of the Fe-Ni-Te System

Effects of impurities on graphite shape during solidification of spheroidal graphite cast ions

Corrosion of 316L in liquid tellurium at 551°C

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