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Carburisation of nickel‐base alloys and its effects on the mechanical properties
Author(s) -
Klöwer J.,
Heubner U.
Publication year - 1998
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/(sici)1521-4176(199804)49:4<237::aid-maco237>3.0.co;2-5
Subject(s) - alloy , charpy impact test , metallurgy , ductility (earth science) , materials science , chromium , aluminium , nickel , carbon fibers , 6063 aluminium alloy , ultimate tensile strength , composite material , creep , composite number
The effect of carburisation on the ductility in terms of Charpy V‐notch impact energy of five nickel‐base alloys (alloy 45‐TM, alloy 600H, alloy 617, alloy 601 and alloy 602CA) and three iron‐nickel‐chromium alloys (alloy 800H, alloy AC66, alloy DS) with different concentrations of aluminium, chromium and silicon was investigated in CH 4 — H 2 at a carbon activity of a c = 0.8 at 850°C and 1000°C. All chromia‐forming materials suffer carbon pick‐up, formation of internal carbides and a severe loss of ductility during exposure. The loss of Charpy V‐notch impact energy after exposure is directly correlated to the carbon pick‐up. The susceptibility to carburisation increases with increasing iron concentration and decreasing nickel concentration of the alloy. Silicon was found to decrease the carbon pick‐up and the loss of ductility. Alumina‐forming alloys do not suffer any significant ductility loss by carburisation.