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

Savchenko, V. S.; Yushchenko, K. A.; Zvjagintseva, A.; David, S. A.; Vitek, J.M.

doi:10.1007/bf03266611

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…Current researches about the welding of single crystals were mostly focused on Nickel-based alloys [12][13][14][15][16]21,23,29], but Nickel has much lower melting point (1400°C) than refractory metals, which makes it hard to apply the results concerning Nickel to refractory metals, such as Molybdenum (2600°C), Rhenium (3200°C) and Tungsten (3400°C). In fact, it was clearly found that the microstructure of the weld in Molybdenum was quite different from that of Nickel.…”

Section: Introductionmentioning

confidence: 99%

Formation of low angle boundaries and stray grains in welds of single-crystal Mo-3Nb alloys

Zhao

Zheng

Huang

et al. 2019

Science and Technology of Welding and Joining

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Mo-3Nb single-crystal alloy is an ideal material for emitters of thermionic fuel elements. In this experiment, heat-affected zone of electron beam welding of Mo-3Nb single-crystal tubes was investigated, and it was discovered that heat-affected zone basically inherited the orientation of parent metal while there were still plenty of low angle boundaries and a few stray grains (SGs). Those low angle boundaries (LABs) stemmed from the fusion line and converged toward the centreline. Besides, the distribution of LABs was asymmetrical about the centreline of welding pool, and Laue diffraction pattern showed that the side with more LABs had higher dislocation density than the other. Furthermore, SGs existed merely at the bottom of welding pool and were discontinuously distributed along the circumferential direction of single-crystal tube.

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