Structural conversions in VT22 titanium alloy during aging

Shevel'kov, V. V.

doi:10.1007/bf00775008

Cited by 2 publications

(3 citation statements)

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“…The cooling rate and platform temperature differ for individual EBM processes and depend primarily on the process parameters used and the volume of the specimens built. Nucleation of the α from the β starving regions was seen to occur at 500°C after only 0.1 h [34].…”

Section: Resultsmentioning

confidence: 99%

The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

et al. 2019

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In this article, the authors discuss the results of studies into the processing of Ti-5Al-5Mo-5V-1Cr-1Fe near-β titanium alloy (Ti-55511) by electron beam melting (EBM), an additive manufacturing technique. Due to its high flexibility in shaping mechanical properties, Ti-55511 alloy is commonly used in aircraft components such as landing gear or airframes. In this study, Ti-55511 powder was used and its properties were described as regards chemical composition and particle size distribution in order to assess its suitability for EBM processing and repeatability of results. 20 sets of processing parameters were tested in the energy input range between 10 J/mm3 and 50 J/mm3 (cathode current, 4.5 mA-19.5 mA; scanning speed, 1080 mm/s–23400 mm/s). Four types of top surfaces were obtained, namely, flat, orange peel, with single pores, and with swelling. Best results were obtained for the energy of 30 J/mm3: flat top surface and relative density in excess of 99.9%. Analysis of chemical composition showed that aluminum loss was below the specification minimum for the analyzed parameter sets. Scanning speed most significantly affected aluminum content: the lower the scanning speed, the higher the aluminum loss. Analysis of microstructures showed the dependence of lamellar α-phase volume fraction on the process parameters used. For low scanning speed, the determined α-phase volume accounted for about 78%. Higher scanning speed resulted in a decrease of the α-phase content to 61%. The dimensions of the lamellas and the amount of the α-phase strongly effected hardness results (360 HV to 430 HV).

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Section: Resultsmentioning

confidence: 99%

The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

et al. 2019

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“…Ti55511 alloy during ageing [11,[17][18][19][20][21], while some others reported only microstructural changes without providing data on the mechanical properties [13,22]. Mechanical properties of cast/wrought Ti-55511 alloy after ageing at different conditions are listed in Table 1; they are dependent on the complete processing schedule.…”

Section: Most Of the Previous Investigations Mentioned Only The Mechamentioning

confidence: 99%

“…It is mentioned in [22], that the growth of the α phase could be due to (i) the increase of diffusional mobility of atoms at the temperature of ageing and (ii) the need to decrease surface-to-volume ratio of needle-like α particles in order to reduce the total energy of the system. In the present study no α" phase appears contrarily to the findings by Shevel'kov [22], because shorter ageing times used were not sufficient to produce large concentration gradients within β phase. The obtained microstructures are in good agreement with the existing literature [13,14,31,32].…”

Section: The Evolution Of Microstructurementioning

confidence: 99%