scholarly journals Short Range Ordering (SRO) Reaction in Ni-base Alloy X-750

2020 ◽  
Vol 58 (9) ◽  
pp. 590-598
Author(s):  
SungSoo Kim ◽  
Jung Jong Yeob ◽  
Young Suk Kim
Keyword(s):  
Short Range ◽  
Thermal Activation ◽  
Base Alloy ◽  
Exothermic Reaction ◽  
Lattice Contraction ◽  
Exothermic Reactions ◽  
Candu Reactors ◽  
Short Range Ordering ◽  
Endothermic Reactions ◽  
Cold Rolled

The short range ordering (SRO) reaction of the X-750 Ni-base alloy used as a garter spring material for CANDU reactors was systematically investigated through differential scanning calorimeter (DSC) analysis. Water quenching (WQ) after solution annealing (SA) and 20% cold rolled (CR) X-750 were prepared and these samples were subjected to ordering treatment at 475 <sup>o</sup>C for up to 2,160 hours. The WQ and CR specimens showed an exothermic reaction due to the release of entropy formed by the WQ and CR processes, respectively, whereas the ordered WQ and CR specimens exhibited endothermic reactions. The exothermic reaction from the WQ and CR specimens means the SRO reaction occurred. In the WQ specimen, two exothermic reactions at 577 <sup>o</sup>C and 671 <sup>o</sup>C were observed, which corresponds to SRO formation of Ni<sub>2</sub>Cr and CrFe, respectively. The critical temperature and thermal activation energy for these specimens were measured by varying the heating rate. The lattice variation with ordering time at 475 <sup>o</sup>C up to 2,160 hours was measured by XRD using CuKa X-ray. A 0.03-0.09% lattice contraction of the (200) plane occurred, depending on prior treatment condition. We discuss whether a lattice contraction due to SRO reaction may cause voids, providing formation sites for He bubbles in the X-750 garter spring exposed to the operating environment of the CANDU reactor.

scholarly journals Susceptibility to Severe PWSCC (primary water stress corrosion cracking) of LTMA (low temperature mill anneal) Alloy 600

2020 ◽  
Vol 58 (12) ◽  
pp. 815-821
Author(s):  
Sung Soo Kim ◽  
Jung Jong Yeob ◽  
Young Suk Kim
Keyword(s):  
Water Stress ◽  
Low Temperature ◽  
Stress Corrosion Cracking ◽  
Short Range ◽  
Alloy 600 ◽  
Lattice Contraction ◽  
Short Range Ordering ◽  
Mill Anneal ◽  
Primary Water ◽  
Kinetics Of

It has been proposed that a primary water stress corrosion cracking (PWSCC) in pressurized water reactor (PWR) is governed by a lattice contraction due to a short range ordering reaction in Alloy 600. This leads researcher to think that the kinetics of lattice contraction may control a susceptibility of PWSCC in Alloy 600. A lattice variation with ordering treatment at 400 <sup>o</sup>C was systematically investigated using high resolution neutron diffraction(HRPD) in high temperature mill anneal (HTMA), low temperature mill anneal (LTMA), and sensitized (SEN) Alloy 600. The results showed that ordering treatment caused an isotropic lattice contraction due to short range ordering (SRO) reaction. The lattice contractions of (111) plane are saturated to be 0.04% in 4 to 1500 hours at 400 <sup>o</sup>C according to prior treatment condition. The lattice contraction in the magnitude of 0.03% of (111) plane in LTMA Alloy 600 is faster by 8 times and 66 times than that of SEN and HTMA, respectively. This fact may explain why the LTMA is most susceptible to PWSCC through of kinetics of lattice contraction in Alloy 600. Thus, it is possible to conclude that the susceptibility of Alloy 600 to PWSCC is governed by the kinetics of (111) lattice contraction.

Short Range Ordering-Disordering in an FeNiB Metallic Glass

1983 ◽  
Vol 28 ◽  
Author(s):  
A. Kursumovic
Keyword(s):  
Activation Energy ◽  
Heat Flow ◽  
Low Temperature ◽  
Short Range ◽  
Creep Recovery ◽  
Velocity Of Sound ◽  
Glassy Material ◽  
Exothermic Reactions ◽  
Short Range Ordering ◽  
Temperature Relaxation

ABSTRACTLow temperature relaxation of Fe40Ni40B20 glassy samples was monitored by DSC, velocity of sound and creep recovery measurements. The as-quenched samples exhibited very pronounced exothermic reactions in the temperature region prior to crystallization. Reversible changes were found during subsequent heat treatmentof preannealed glassy material having exothermic and endothermic heat flow during ordering and disordering respectively. Results were found to be in agreement with velocity of sound and creep recovery changes, found earlier , having activation energy for these reversible changes around 160 kJ/mole.

WC-3015 Alloy

Alloy Digest ◽  
1974 ◽  
Vol 23 (5) ◽  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Base Alloy ◽  
Heat Treating ◽  
Rolled Sheet ◽  
Good Oxidation Resistance ◽  
Structural Applications ◽  
Cold Rolled

Abstract WC-3015 is a columbium-base alloy developed for structural applications in high-temperature oxidizing environments. It is characterized by good oxidation resistance, good mechanical properties and compatibility with silicide coatings. Cold-rolled sheet can be joined and welded without cracking. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: Cb-21. Producer or source: Wah Chang, a Teledyne Corporation.

Emulation of short-range ordering within the Compound Energy Formalism: Application to the calcite-magnesite solid solution

Calphad ◽  
2019 ◽  
Vol 64 ◽  
pp. 115-125 ◽  
Author(s):  
Xin Liu ◽  
Victor L. Vinograd ◽  
Sergii Nichenko ◽  
Dmitrii A. Kulik ◽  
Xiancai Lu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Short Range ◽  
Compound Energy Formalism ◽  
Short Range Ordering

Short-range-ordering in the Ba2+ ion distribution in Ba2+ β''-alumina at 295 K

1984 ◽  
Vol 40 (3) ◽  
pp. 208-213 ◽  
Author(s):  
J. O. Thomas ◽  
M. Aldén ◽  
G. J. McIntyre ◽  
G. C. Farrington
Keyword(s):  
Short Range ◽  
Ion Distribution ◽  
Short Range Ordering

scholarly journals Short range ordering in Fe–Ge and Fe–Ga single crystals

2009 ◽  
Vol 95 (17) ◽  
pp. 171907 ◽  
Author(s):  
Mianliang Huang ◽  
Thomas A. Lograsso
Keyword(s):  
Single Crystals ◽  
Short Range ◽  
Short Range Ordering

Short-range ordering inAlxGa1−xAsgrown with metal-organic vapor-phase epitaxy

1999 ◽  
Vol 59 (15) ◽  
pp. 10296-10301 ◽  
Author(s):  
A. J. Heinrich ◽  
M. Wenderoth ◽  
K. J. Engel ◽  
T. C. G. Reusch ◽  
K. Sauthoff ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Short Range ◽  
Vapor Phase Epitaxy ◽  
Organic Vapor ◽  
Short Range Ordering ◽  
Metal Organic
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