High-temperature failure of a cast soot blower lance tube nozzle
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A cast stainless steel lance tube nozzle failed prematurely in a brittle manner after one to two years of service. Metallographic examination of the nozzle revealed a Widmanstätten structure, likely resulting from the precipitation of sigma phase. The presence of this structure suggests that the component was exposed to temperatures beyond the specified operating range.
Keywordsbrittle fracture CK-20 stainless steel high-tempersture failure sigma phase
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