Mechanical properties and precipitation evolution behavior of V–5Cr–5Ti alloy after cold rolling

• Published in: Fusion engineering and design Vol. 114; pp. 76 - 83
• Main Authors: Li, Z.D., Li, Q., Li, Y., Lin, C.G., Cui, S., Ma, T.D.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2017; Elsevier Science Ltd
• Subjects: Annealing; Chemical precipitation; Cold rolling; Face centered cubic lattice; Lattice parameters; Lattice patameter; Lattice theory; Mechanical properties; Microstructure; Optical microscopy; Precipitates; Scanning electron microscopy; Titanium alloys; Transmission electron microscopy; V-5Cr-5Ti; Vanadium base alloys; Cold rolling; Lattice patameter; Microstructure; Precipitates; V-5Cr-5Ti
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2016.11.017

•Precipitation evolution behavior of cold-rolled V–5Cr–5Ti alloy was investigated.•There are two kinds of HCP structure precipitates in cold-rolled V–5Cr–5Ti alloy.•The precipitates were broken into small spherical particles during cold rolling.•The stable precipitates with FCC structure were formed after annealing. The mechanical properties and precipitation behavior of V–5Cr–5Ti alloy were investigated after 80% cold rolling and annealing by optical microscopy, scanning electron microscopy, transmission electron microscopy (TEM), and tensile testing. The TEM analysis revealed that the cold-rolled V–5Cr–5Ti alloy had two kinds of precipitates with an hexagonal close-packed(HCP) structure. The rectangular precipitate had the following lattice parameters: a=0.3041–0.3048nm, c=0.5153–0.5158nm, and c/a=1.69. The elliptically shaped precipitate had the following lattice parameters: a=0.3080–0.3082nm, c=0.5003–0.5009nm, and c/a=1.62. The other precipitates had a face-centered cubic(FCC) structure. The precipitates were broken into small spherical particles, which were arranged in the vicinity of the band structure. After annealing (1273 K×1h), the stable precipitates were formed by increasing the components of Cr and N. The yield strength of cold-rolled V–5Cr–5Ti alloy after annealing was 21.5% higher than that before cold rolling, and the yield ratio increased from 0.69 to 0.79.