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Hot corrosion cracking of stainless steel
Author(s) -
Radhakrishnan V. M.,
Iyer K. J. L.,
Iyer S. R. K.
Publication year - 1982
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/maco.19820330805
Subject(s) - materials science , cracking , fracture mechanics , metallurgy , kerosene , stress intensity factor , sulfur , corrosion , crack closure , stress corrosion cracking , composite material , fracture (geology) , grain boundary , microstructure , chemistry , organic chemistry
Investigations have been carried out to study the hot corrosion cracking and crack propagation in 304 type stainless steel at 700°C. Kerosene was used as the base fuel to which CS 2 was added in controlled quantities to obtain different sulphur contents (2.5% and 5%). Crack propagation tests were carried out at three stress levels. It has been observed that an increase in the sulphur content of the fuel reduces the crack initiation time, increases the crack propagation rate and decreases the rupture life. The crack growth rate plotted against the LEFM (linear elastic fracture mechanics) parameter K resulted in a sigmoidal type of relation, which could be well correlated by a model based on COD approach. The threshold stress intensity factor K 0 is reduced with increasing sulphur content. Fractographic studies by SEM and light microscope revealed crack propagation through grain boundaries, which were weakened by the formation of low melting sulphides.