Structure and Hardness Variations Through Section of Hot-Forged Pipe Billet from PT-1M Alloy

Abstract

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Structure, Texture and Mechanical Properties through the Section of the Hot-Extruded Tube of Titanium Alloy PT-1M

“…There are only lines from the α-phase with the HCP lattice. The lattice parameters of the α phase is a = 0.29476 ± 0.00003 nm, c = 0.46826 ± 0.00005 nm, c/a = 1.589, which is close to the values of [9,10]. The obtained value of the "c/a" parameter is higher than that of pure titanium (1,587), due to the additional alloying with aluminum, which increases this parameter [18].…”

“…5. At the same time, it can be noted that this is 4 times less than that of the hot-deformed initial billet (20 units HV) [9]. In this case, the average value over the entire cross section of the semifinished product slightly increased to 155 units HV in the hot-pressed pipe with 150 units HV in the initial billet [9].…”

“…At the same time, it can be noted that this is 4 times less than that of the hot-deformed initial billet (20 units HV) [9]. In this case, the average value over the entire cross section of the semifinished product slightly increased to 155 units HV in the hot-pressed pipe with 150 units HV in the initial billet [9]. The decrease in the scatter of hardness values over the cross section of the hot-extruded tube as compared to the hot-formed initial billet is associated with the development of recrystallization processes noted above and the formation of a more uniform finegrained structure.…”

“…The decrease in the scatter of hardness values over the cross section of the hot-extruded tube as compared to the hot-formed initial billet is associated with the development of recrystallization processes noted above and the formation of a more uniform finegrained structure. Whereas there was a significant heterogeneity of the structure over the cross section of the initial billet [9].…”

“…Hot-rolled tubes of titanium alloys, including PT-1M, are produced by hot extrusion or rolling [8]. We showed that the structure of a hot-rolled large-sized tube billet of PT-1M alloy is not uniform over the section, with a large grain in the center [9]. Expanding at 850 °С leads to the grinding of grains and obtaining a more homogeneous structure due to the development of recrystallization processes [10].…”