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Heat treatment of titanium

Heat treatment of titanium and its alloys. Most high strength alloys are characterized by satisfactory weldability. Alloys TC6, VT16, VT23, VT15 - suitable for thermosetting, VT22, VT6, VT14 and vt3-1 - for thermosetting and annealing. After heat treatment of titanium and its alloys, the best properties of welded joints can be realized.


For titanium and its alloys and welded joints, the following types of heat treatment are mainly used: annealing, hardening and aging. In the structure, titanium alloys can be used after rolling, annealing or hardening heat treatment. Compared with fe-based alloys, titanium alloys are hardened by heat treatment, mainly through dispersion hardening and aging.


Annealing involves heating to a certain temperature and then keeping it cool in the air to obtain a stable alloy, using a high alloy furnace. Table 1 shows the annealing pattern. The exposure time at these temperatures depends on the thickness of the workpiece. The following excerpts are recommended for bed sheets:


Plate thickness, mm≤1,51.6 to 2.03.1 to 6.06
Hold time, minutes15202560


Exposure time for incomplete annealing (tempering) is 20... 60 minutes.


Thermally stable alloys (i.e. Titanium, - and pseudo- alloys) and their welded joints undergo the first annealing (above the alloy recrystallization temperature) to relieve residual welding stress (temperature 500... 600 ° С, exposing 0.5 c... 1 h) and thin-walled structures, for this purpose, at 600... 650 ° C temperature preservation in rigid equipment 0.5... 1 hour.


The annealing of the (+) alloy and its welded joints combines the elements of the first annealing based on the recrystallization process and the second annealing based on the phase recrystallization process. For these alloys, recrystallization annealing is used in addition to simplicity. It includes heating the alloy at a relatively high temperature sufficient for the recrystallization process, cooling to a temperature that ensures high stability of phase (lower recrystallization temperature), and aging at that temperature, followed by cooling in the air.


During the hardening heat treatment of titanium (+) alloys and metastable alloys, their base metals are annealed or hardened before welding, hardened and aged after welding. If the joint is located in the thickened zone, the following variations in the sequence of welding and heat treatment operations are possible: quench-aging weld-local annealing; Hardening - welding aging.


Table 1. Heat treatment of titanium: polycrystalline transition, recrystallization, annealing and removal of residual welding stress (complete annealing) of industrial titanium alloys.


Titanium alloyTemperature, °C
Polymorphism
       Conversion
re-crystallizeAnnealed plateRemove residual stress in the welded structure (incomplete annealing)
At the beginningEnd
VT1-00885 ... 890580670520 ... 540445 ...... 485
VT1-0885 ... 900600700
VT5930 ... 980750850-550 ... 600
VT5-1950 ... 990680950700 ... 750
OT4-0860 ... 930800590 ... 610480 ... 520
OT4-1910 ... 950720840640 ... 660520 ... 560
OT4920 ... 960760860660 ... 680545 ... 595
VT4960 ...... 1000780900690 ... 710550 ... 650
OT4-2990 ... 1050800930710 ... 730600 ... 650
BT20950700 ... 800
AT2870 ... 910-600 ... 650430 ... 560
AT3990 ...... 1000800 ... 850545 ... 585
AT4950 ... 1020850 ... 870600 ... 650
TC5970 ... 1020760 ... 780
VT6S950 ... 990850950750 ... 800550 ... 600
VT6980 ... 1010550 ... 650
VT14920 ... 960900930740 ... 760
VT16840 ... 880820840730 ... 770520 ... 650
VT22800825740 ... 760550 ... 650
VT15750 ... 800500770 
TC6770 ... 810-790 ...... 810
VT23880 ... 930740 ... 760


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