Abstract
TG/DSC tests of hydrogenated TC21 alloys were carried out. Effects of temperature and holding time on the residual hydrogen contents of hydrogenated TC21 alloys and their microstructures were analyzed. Results show hydrogen atoms begin to release from the hydrogenated TC21 alloys when the heating temperature reaches 500 °C. Release of hydrogen from the hydrogenated TC21 alloy appears at the heating temperature in the range of 500 °C to 700 °C. The area of the endothermic peak of the hydrogenated alloy is consistent with its hydrogen content. The residual hydrogen contents in the alloys dehydrogenated at different temperatures all decrease with the increase of holding time. When the hydrogenated TC21 alloy is dehydrogenated at 700 °C, hydrogen has not been removed completely when the holding time reaches 8 h because of its low dehydrogenation rate. Hydrogen can be removed completely when the alloys are dehydrogenated at 750 °C for 4 h or 800 °C for 2 h. The grains in all dehydrogenated TC21 alloys are effectively refined compared with those in the as-received alloy. With the increase of holding time, the grains in the alloys dehydrogenated at different temperatures all grow up. The optimal dehydrogenation temperature of hydrogenated TC21 alloy is 750 °C.
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