Brittle fractures in austenitic steel parts
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With the temperature increasing to 800°C, the yield strength value of solutionized austenitic steel (with a homogeneous, non-equilibrium structure) falls to almost one-half and the elongation to one-third of the respective room temperature figures.
Formation of secondary phases during aging (service) reduces the ductility of the steel both at room and at elevated temperatures.
Incomplete removal of cold work induced by cold rolling results in a drastic loss of ductility at elevated temperatures.
Work hardening due to forming operations, for instance, cold bending, lowers the ductility of austenitic steel at high temperatures the more, the heavier the deformation.
Brittle failures (without creep) of austenitic steels in service are attributable to the combined action of the aforementioned factors, especially one that is extraordinarily strong.
KeywordsBrittle Ductility Yield Strength Elevated Temperature Cold Work
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