"Avtomatychne Zvaryuvannya" (Automatic Welding), #6, 2024, pp. 35-42
Influence of the condition of the surface on the fatigue resistance of samples with hole from VT22 alloy at restorative surfacing
A.O. Gorpenko, O.I. Semenets
«ANTONOV COMPANY». 1 Acad. Tupolev Str., 03062, Kyiv, Ukraine.
E-mail: timanz.ag@gmail.com
Six samples with holes made from high-strength titanium alloy VT-22, which have passed fatigue tests, were studied. The tests
were conducted on samples whose surfaces were restored by inert-gas arc surfacing using SP-15 alloy filler wire. Obtained
results confirm a significant improvement in the deposited layer structure and a reduction in the negative impact of welding
defects. Subsequent local heat treatment (LHT) markedly enhanced the mechanical properties of the samples in the weld zone.
Samples of Group 2, which had relatively uniform microhardness in the heat-affected zone (HAZ), after LHT demonstrated
high resistance to failure, unlike samples of Group 1, which showed significant microhardness variations in the HAZ. Noncompliance
with LHT modes for Group 1 samples resulted in six times reduction in service life compared to Group 2. The
detected surface defects of the holes in Group 1 samples negatively affected the crack initiation rate. The obtained results
emphasize the importance of adhering to specified parameters of surfacing, final part treatment, and LHT modes to enhance the
efficiency and reliability of the restoration procedure. 11 Ref., 5 Tabl., 11 Fig.
Keywords: high-strength titanium alloy VT-22, surface defects, surfacing, heat-affected zone, cyclic loading
Received: 21.06.2024
Received in revised form: 11.09.2024
Accepted: 22.10.2024
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