✦ LIBER ✦

Hot corrosion cracking of stainless steel

✍ Scribed by V. M. Radhakrishnan; K. J. L. Iyer; S. R. K. Iyer

Publisher: John Wiley and Sons
Year: 1982
Tongue: German
Weight: 857 KB
Volume: 33
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.19820330805

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

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.

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