Premium
Damage of a heat‐treatment retort by metal dusting attack
Author(s) -
Dettenwanger F.,
Grotmann D.,
Friedrich H.,
BerghofHasselbächer E.,
Schorr M.,
Schütze M.
Publication year - 1999
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(199905)50:5<289::aid-maco289>3.0.co;2-d
Subject(s) - retort , carbide , carburizing , metallurgy , metal , chemistry , chromium , oxide , oxidizing agent , materials science , organic chemistry
The damage of a heat‐treatment retort which was made of cast Fe36Ni21Cr steel and used under a carburizing atmosphere at about 900 °C has been investigated. Strong corrosion attack had occurred, leading locally to pitting on the surface or even to hole formation in the retort walls. An oxide layer rich in chromium had formed on the outside of the metal followed by a precipitation zone of carbides. These carbides decomposed near the surface into graphite and the corresponding metal, similar to “metal dusting”. The strong corrosion attack was often correlated with preexisting imperfections in the cast material like shrinkage cavites or microporosity.