The Cryogenic Tensile and Fracture Toughness Properties of Austenitic Steels Given Low Temperature, Short-Time Nb3Sn Reaction Heat Treatments
Commercial 316L and 316LN alloys have been evaluated for service as the conduit material for the 45-T Hybrid Magnet. The 4 K tensile and fracture toughness properties of these alloys have been measured before and after a simulated Nb3Sn reaction heat treatment. The tensile properties have been found to be unaffected by the heat treatment short, low temperature proposed for high performance superconductors. The fracture toughness also does not change with heat treatment although there is evidence of discontinuous intergranular precipitation in the high carbon 316LN alloy. Uncharacteristically low toughness is reported for one alloy in both the as received and heat treated condition.
KeywordsFracture Toughness Austenitic Steel Charpy Impact Aging Heat Treatment Fracture Toughness Property
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- 2.R. P. Reed, R. P. Walsh, and C. N. McCowan, Effects of Nb3Sn heat treatment on the strength and toughness of 316LN alloys with different carbon contents, Adv. Cryo. Eng. 38:45 (1992).Google Scholar
- 3.M. Shimada and S. Tone, Effects of Niobium on Cryogenic Mechanical Properties of Aged Stainless Steel, Adv. Cryo. Eng. 34:131 (1988).Google Scholar
- 5.J. Kubier, H.-J. Schindler, and W. J. Muster, Influence of aging on the fracture toughness of cryogenic austenitic materials evaluated by a simple test method, Adv. Cryo. Eng. 38:191 (1992) vol. 38, pp. 191–198, 1992.Google Scholar