Abstract
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. Cracks in the single crystal weld along the strain grain boundaries are formed by a similar mechanism.
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Savchenko, V.S., Yushchenko, K.A., Zvjagintseva, A. et al. Investigation of Structure and Crack Formation in Welded Joints of Single Crystal Ni-Base Alloys. Weld World 51, 76–81 (2007). https://doi.org/10.1007/BF03266611
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DOI: https://doi.org/10.1007/BF03266611