Investigation of Structure and Crack Formation in Welded Joints of Single Crystal Ni-Base Alloys

Journal Article · Thu Feb 07 04:00:00 EST 2013 · Welding in the World

DOI:https://doi.org/10.1007/BF03266611· OSTI ID:1474746

Savchenko, V. S. ^[1]; Yushchenko, K. A. ^[1]; Zvjagintseva, A. ^[1]; David, S. A. ^[2]; Vitek, J. M. ^[2]

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1. E. O. Paton Electric Welding Institute (Ukraine)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Conditions of initiation of hot cracks in welding of single crystal heat-resistant alloys with a 56% content of the γ’-phase were studied. Conditions for providing a polycrystalline structure in HAZ and part of the weld metal were artificially created in one region of a welded joint with the single crystal structure. Welding of the single crystal alloy was performed by the electron beam method in vacuum. Cracks in a low-temperature ductility dip range (ductility dip cracking) were found to form in HAZ and weld of a welded joint with the polycrystalline structure. The nature of cracking of the single crystal weld is related to formation of low-melting point eutectoid interlayers, as well as to exhausting of the safety factor for ductility. In conclusion, cracks in the single crystal weld along the strain grain boundaries are formed by a similar mechanism.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1474746
• Journal Information: Welding in the World, Journal Name: Welding in the World Journal Issue: 11-12 Vol. 51; ISSN 0043-2288
• Publisher: Springer Nature
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE