Products tagged with 'long-range ordering'

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Long Range Ordering In Thermally Treated And Cold-Worked Alloy 690

Product Number: ED22-17251-SG

Author: Daniel Brimbal, Pierre Joly, Claude Benhamou, Cécilie Duhamel, Michael A. Burke, Annie Pagès, Bénédicte Gueraud

Publication Date: 2022

$20.00

Nickel-chromium alloys may be susceptible to ordering under certain thermal aging conditions, resulting in the formation of an Ni2Cr phase. The Ni2Cr phase is a superlattice which can result in significant changes of the physical or mechanical properties compared to those of the disordered alloy. Alloy 690, which usually contains a bit less than two nickel atoms per chrom-ium atom, could potentially be susceptible to long-range ordering (LRO) or short-range ordering (SRO). SRO implies that a Cr atom has a high probability of having a Ni nearest neighbor and that small order domains containing at most a few atoms exist. LRO implies that small Ni2Cr clusters exist, and although they may not be visible by transmission electron microscopy (TEM) dark field imaging, they lead to the detection of
additional diffraction spots in selected area electron diffraction (SAED) patterns, contrary to SRO. Below the critical temperature for LRO, the formation of the long-range ordered structures is preceded by a period of short-range ordering.

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Long-Term Aging Behavior Of Cold-Worked Alloy 690 In Simulated PWR Primary Water

Product Number: ED22-18358-SG

Author: Ziqing Zhai, Matthew J. Olszta, Mychailo B. Toloczko

Publication Date: 2022

$20.00

Alloy 690 has been utilized since the late 1980s as a replacement for Alloy 600 in pressurized water reactors (PWR) pressure boundary components due to laboratory data indicating higher resistance to stress corrosion cracking (SCC). Although to date no SCC incidents have been reported on Alloy 690 components in service, the growing interest of extending the operation life of PWRs beyond 60 or even 80 years has raised concerns for the potential occurrence of long-range ordering (LRO) in Alloy 690 and its compatible weld metals.

Products tagged with 'long-range ordering'

Long Range Ordering In Thermally Treated And Cold-Worked Alloy 690

Long-Term Aging Behavior Of Cold-Worked Alloy 690 In Simulated PWR Primary Water

Association for Materials Protection and Performance