An experimental batch of connecting M12 bolts for aerospace application was produced by the method of rapid heat treatment with hot heading from the rods of VT22 alloy obtained as a result of intense hot plastic deformation (step-by-step forging and rolling). After final aging in the course of tensile tests, the bolts had the following characteristics: the yield and ultimate strengths equal to 1380 and 1455 МРа, respectively, a relative elongation of 7.2%, and a relative narrowing of 24.3%. The tests carried out according to the program developed at the “ANTONOV” State Enterprise showed that the fatigue and low-cycle fatigue are almost two times higher in the case of thread rolling performed in the completely thermally hardened state, i.e., after final aging. We also established the possibility of enhancement of the fatigue characteristics of the bolts by improving the technology of mechanical treatment.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 51, No. 3, pp. 62–67, May–June, 2015.
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Ivasyshyn, О.М., Vasylevs’kyi, E.T., Antonyuk, S.L. et al. Specific Features of Fracture of High-Strength Bolts of VT22 Alloy. Mater Sci 51, 366–371 (2015). https://doi.org/10.1007/s11003-015-9850-8
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DOI: https://doi.org/10.1007/s11003-015-9850-8