The effects of cold working on sensitization and intergranular corrosion behavior of AISI 304 stainless steel |
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Authors: | Raghuvir Singh I Chattoraj A Kumar B Ravikumar P K Dey |
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Affiliation: | (1) CRP Division, the National Metallurgical Laboratory, 831007 Jamshedpur, India;(2) MTC Division, the National Metallurgical Laboratory, 831007 Jamshedpur, India |
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Abstract: | The effects of prior cold rolling of up to an 80 pct reduction in thickness on the sensitization-desensitization behavior
of Type AISI 304 stainless steel and its susceptibility to intergranular corrosion have been studied by electrochemical potentiokinetic
reactivation (EPR) and Strauss-test methods. The results indicate that the prior deformation accelerated the sensitization
as compared to the undeformed stainless steel. The deformed Type 304 stainless steel experienced desensitization at higher
temperatures and times, and it was found to be enhanced by increased cold deformation. This could be attributed to the increased
long-range chromium diffusion, possibly brought on by increasing pipe diffusion and vacancies. The role of the deformation-induced
martensite (DIM) and texture, introduced by uniaxial cold rolling, on the sensitization-desensitization kinetics has also
been discussed. This study could not reveal any systematic relationship between texture and the degree of sensitization (DOS)
obtained. The effect of DIM on DOS seems to be pronounced at 500 °C when the steel retained significant amounts of DIM; however,
the retained DIM is insignificant at higher sensitization times and temperatures. |
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