ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The method for production of a structure with a grain size of 30-40 nm in two-phasetitanium alloys is proposed. It is shown, that the nanostructure can be formed in billets of150×70×15 mm, and sheets of 250×150×1 mm. The method consists of several steps includinghydrogen alloying of the alloy, heat treatment, warm deformation and finally dehydrogenatingvacuum annealing.α-, α+β and β-titanium alloys have been investigated. Hydrogen content varied in the range 0.1–30 at. %. Microstructure was examined using optical, scanning, transmission electron microscopyand X-ray analysis after every step of the treatment.The investigations have shown that a specific character of phase transformations in hydrogenatedtitanium alloys plays a leading role in formation of nanostructure. The effect of dissolved hydrogenon dynamic recrystallization in α- and β- phases is of a secondary importance. Additionalrefinement in structure is observed in the deformed alloys after vacuum annealing, if its temperatureis less than the temperature of their deformation.The work was focused on the optimization of hydrogen content and deformation conditions withthe aim to create the nanostructure in titanium alloys and to enhance their mechanical properties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.86.pdf
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