Study of Hot Salt Stress Corrosion Crack Initiation of Alloy IMI 834 by using DC Potential Drop Method
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DC potential drop technique was employed during the slow strain rate tests to study the hot salt stresscorrosion crack (HSSCC) initiation at 300 and 400 °C. Threshold stresses for HSSCC initiation were foundto about 88 % of the yield strength at both temperatures, but the time from crack initiation to final failure(Δtscc) decreased significantly with temperature, which reflects larger tendency for brittle fracture and secondarycracking. The brittle fracture features consisted of transgranular cracking through the primary α grain anddiscontinuous faceted cracking through the transformed β grains.
Abstract
DC potential drop technique was employed during the slow strain rate tests to study the hot salt stresscorrosion crack (HSSCC) initiation at 300 and 400 °C. Threshold stresses for HSSCC initiation were foundto about 88 % of the yield strength at both temperatures, but the time from crack initiation to final failure(Δtscc) decreased significantly with temperature, which reflects larger tendency for brittle fracture and secondarycracking. The brittle fracture features consisted of transgranular cracking through the primary α grain anddiscontinuous faceted cracking through the transformed β grains.
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