Microstructure and properties of alloy HP50–Nb: comparison of as cast and service exposed materials
作者:
ThomasC. W.,
StevensK. J.,
RyanM. J.,
期刊:
Materials Science and Technology
(Taylor Available online 1996)
卷期:
Volume 12,
issue 6
页码: 469-475
ISSN:0267-0836
年代: 1996
DOI:10.1179/mst.1996.12.6.469
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractSpun cast alloy HP50–Nb tubing retired from service in a steam reformer after approximately 8 years of service had stress rupture properties suggesting very short remaining life. Microstructural examination, however, indicated little or no creep damage (cavitation) but did reveal extensive microstructural modification. The microstructure, mechanical properties, and stress rupture properties of the ex service material were determined and compared with virgin as cast material. The microstructural changes that occurred during service included the formation of phases rich in alloying elements such as chromium and niobium that would otherwise be expected to contribute to high creep strength. The creep life of the service exposed material was correspondingly short. The creep ductility of the service exposed material, however, was significantly higher than that of the as cast material. The implications of these findings for remaining life assessments of reformer furnaces using these materials are discussed.MST/3207
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