Previous studies have considered the sensitization of Type 304 stainless steel that occurs during continuous cooling through the sensitization temperature range and the influence of prior strain on this behavior. This study is of the influence of the effect of straining during this cooling. It was found that straining during cooling will enhance sensitization, but that strains on the order of 5% are required if only a single cooling cycle is employed. If multiple cycling is used; i.e., heating and cooling in successive cycles, then strains as small as 0.8% per cycle are shown to promote sensitization providing the peak temperature of each cycle is 800 C. When the peak temperature of each cycle is 1000 C, then, there was no cumulative effect of multiple cycling, even when 1% strain is applied during each of 10 successive cycles. This paper also shows that air cooling, compared to water quenching after an anneal, can make a specimen more susceptible to sensitization due to a subsequent continuous cooling exposure.
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Solomon et al. (1980) studied this question.
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