Cryogenic mechanical properties of high-manganese steel weldments

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The structural alloys used in fusion reactor magnets of the next generation are required to have a 4.2 K yield strength and fracture toughness combination superior to that of alloys used currently. An alloy of nominal composition 18Mn-5Ni-16Cr-0.22N after proper thermomechanical treatment approaches the JAERI projected requirements and exceeds the proposed US requirements for 4.2 K yield strength and fracture toughness in the base metal. However, the properties in the welded condition are still uncertain. This work investigates the effect of autogenous GTAW on the cryogenic properties of this alloy. It was found that the 4.2 K yield strength of ... continued below

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Pages: 11

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Chan, J.W. & Morris, J.W. Jr. August 1, 1985.

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Description

The structural alloys used in fusion reactor magnets of the next generation are required to have a 4.2 K yield strength and fracture toughness combination superior to that of alloys used currently. An alloy of nominal composition 18Mn-5Ni-16Cr-0.22N after proper thermomechanical treatment approaches the JAERI projected requirements and exceeds the proposed US requirements for 4.2 K yield strength and fracture toughness in the base metal. However, the properties in the welded condition are still uncertain. This work investigates the effect of autogenous GTAW on the cryogenic properties of this alloy. It was found that the 4.2 K yield strength of the weld can be increased through the addition of nitrogen to a 75% He/25% Ar shield gas; specifically, a yield strength comparable to that of the base metal was achieved for a 6 vol % nitrogen addition. Fracture toughness data are still preliminary; however, autogenous welds made on this alloy approach the US requirements for both yield strength and K/sub Ic/.

Physical Description

Pages: 11

Notes

NTIS, PC A02/MF A01; 1.

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  • Cryogenic engineering conference and international cryogenic materials conference, Boston, MA, USA, 12 Aug 1985

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  • Other: DE86005219
  • Report No.: LBL-19226
  • Report No.: CONF-850814-37
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 6248509
  • Archival Resource Key: ark:/67531/metadc1109238

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 1, 1985

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • April 25, 2018, 3:58 p.m.

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Chan, J.W. & Morris, J.W. Jr. Cryogenic mechanical properties of high-manganese steel weldments, article, August 1, 1985; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1109238/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.