Mechanical properties of fully martensite microstructure in Ti-6Al-4V alloy transformed from refined beta grains obtained by rapid heat treatment (RHT)
Scripta Materialia, 2017•Elsevier
Fully martensite microstructures transformed from refined β grains were obtained in a Ti-6Al-
4V alloy by rapid heat treatment (RHT) into a single β phase region followed by water
quenching. Ultrafine-grained equiaxed α+ β microstructure obtained by hot compression of
martensite was used as the starting microstructure for subsequent RHT. By increasing the
heating rate from 10° C/s to 50° C/s, the resulting β grain size was refined from 40 μm to 8
μm, which was the smallest size of β reported so far. Both strength and ductility increased …
4V alloy by rapid heat treatment (RHT) into a single β phase region followed by water
quenching. Ultrafine-grained equiaxed α+ β microstructure obtained by hot compression of
martensite was used as the starting microstructure for subsequent RHT. By increasing the
heating rate from 10° C/s to 50° C/s, the resulting β grain size was refined from 40 μm to 8
μm, which was the smallest size of β reported so far. Both strength and ductility increased …
Abstract
Fully martensite microstructures transformed from refined β grains were obtained in a Ti-6Al-4V alloy by rapid heat treatment (RHT) into a single β phase region followed by water quenching. Ultrafine-grained equiaxed α + β microstructure obtained by hot compression of martensite was used as the starting microstructure for subsequent RHT. By increasing the heating rate from 10 °C/s to 50 °C/s, the resulting β grain size was refined from 40 μm to 8 μm, which was the smallest size of β reported so far. Both strength and ductility increased with decreasing the β grain size, which was attributed to the reduced micro-crack lengths by fractography analysis.
Elsevier
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