Changes in mechanical properties and structure are investigated in alloy VT3-1 rods produced with the use of high temperature thermomechanical treatment (HTMT) on their heating and deformation during straightening as well as during preliminary hot deformation of the billets on a helical rolling mill (HRM). It is stated that the straightening at 550-700 deg C with elongation of ∼ 2% results in some decrease of ultimate strength and in essential enhancement of plasticity and impact strength. In a similar manner, preliminary rolling on HRM affects the properties of rods after final heat treatment. It is shown that rod production according to the experimental processing procedure increases the quality of the rods and can be realized when manufacturing rolled products of alloy VT3-1 with the use of HTMT
G.M. Drapak; Y.I. Shalapko; N.S. Mashovets; N. Radek
Purpose: It was explored fretting resistance titanic alloy VT3-1 (Ti-Al6-Cr2-Mo2,5) after low temperature ionicnitriding in unhydrogen environment.Design/methodology/approach: Small amplitude fretting was initiated by the dynamic contact of ball andflat in the regime of the partial slip on edge of spot of contact. A method differs by simplicity and expressdetermination of fretting resistance, namely areas of destruction by action of fretting for part nominally fixedcontact - how the functions...
Fatigue tests run-out specimens up to 106 – 5x107 load cycles are used to determine the stress level named “fatigue limit”. Nevertheless, it is not clear what kind of fatigue cracking takes or will take place in these specimens. To discuss this problem, fatigue tests of titanium alloy VT3-1 specimens have been performed under tension with different values of R-ratio and under rotating-bending after various thermo-mechanical treatments (tempering, surface hardening and their combin...
The regularities of mass transfer and structure formation in the process of thermal reaction electric spark hardening (TRESH) of titanium boride base coatings are investigated. For coatings deposition of titanium alloy VT3-1 and stainless steel 12Kh18N9T substrates aluminium-, copper- and steel sheathed Ti+B, Ti+B+diamond, and TiB2-Ti electrodes are used. It is revealed that coatings wear resistance and TRESH efficiency are determined by the electrode sheath. The highest microhardness of the coatings is obtained with the use of the electrode of TiB2Ti composition. The best wear resistance is observed in coatings with a diamond content up to 40 vol.%. Partial graphitization of diamond results in the formation of composite coatings hardened with carbide and carbonitride phases