Intermediate temperature brittleness of Ni based superalloy Nimonic263

Title
Intermediate temperature brittleness of Ni based superalloy Nimonic263
Authors
정우상정희정허주열
Keywords
Ni based superalloy; Intermediate temperature brittleness (ITB); Ductility minimum; Gamma prime; Precipitate
Issue Date
2018-06
Publisher
Materials characterization
Citation
VOL 140-14
Abstract
Ni based superalloy Nimonic263 offers excellent resistance to corrosion and high temperatures, and as such can be used under an A-USC environment, which has extremely high temperatures and high pressure. To investigate the intermediate temperature brittleness that is the temperature dependence of this alloy, the tensile test was carried out at a constant cross head speed of 1 mm/min in the temperature range of room temperature to 900 °C. As the temperature increased during the test, the constant yield strength decreased sharply at 800 °C while the ductility began to decrease from 500 °C and then recovered after showing a minimum value at 800 °C. The results of the OM, SEM and TEM observations indicate that the deformation mechanism changed from γ′ shearing to bypass as the temperature increased, and the minimum ductility resulted from decohesion of the glide plane.
URI
http://pubs.kist.re.kr/handle/201004/67652
ISSN
1044-5803
Appears in Collections:
KIST Publication > Article
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