Mechanical properties of fully martensite microstructure in Ti-6Al-4V alloy transformed from refined beta grains obtained by rapid heat treatment (RHT). (September 2017)

• Record Type: Journal Article
• Authors: Chong, Yan; Bhattacharjee, Tilak; Yi, Jangho; Shibata, Akinobu; Tsuji, Nobuhiro
• Is Part Of: Scripta materialia. Number 138(2017)
• Page Start: 66
• Page End: 70
• Publication Date: 2017-09
• Subjects: Ti-6Al-4V -- Martensite -- β grain size -- Rapid heat treatment; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.05.038
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: