Toughness and Fatigue Properties of Austenitic Steels at Cryogenic Temperature and their Application in Complex Structures
Austenitic stainless steels playa major role in structures for cryogenic equipment. The mechanical properties (yield strength, ultimate tensile strength etc.) of these materials at cryogenic temperature are relatively well known and are mostly superior to thos'e at ambient temperature. On the other hand, the fracture mechanics properties tend to deteriorate at low temperature and the corresponding data basis is still very limited. To improve this situation, a testing program has been initiated to determine the fracture toughness (JIC, KIC) of several stainless steels presently used in cryogenic structures. Commercially available materials from different vendors were used in the as-received condition without any additional treatment affecting their properties. Measurements' were performed at 77 K and 4 K.
KeywordsFracture Toughness Weld Metal Fatigue Crack Propagation Fatigue Crack Propagation Cold Expansion
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