TY - JOUR
T1 - Microstructure, precipitate and property evolution in cold-rolled Ti-V high strength low alloy steel
AU - Zhang, Xukai
AU - loannidou, Chrysoula
AU - ten Brink, Gert H.
AU - Navarro-López, Alfonso
AU - Wormann, Jan
AU - Campaniello, Jean
AU - Dalgliesh, Robert M.
AU - van Well, Ad A.
AU - Offerman, S. Erik
AU - Kranendonk, Winfried
AU - Kooi, Bart J.
PY - 2020
Y1 - 2020
N2 - A cold-rolled Ti-V high strength low alloy (HSLA) steel was isothermally annealed at 650 °C and 700 °C for different times. A unique combination of techniques including visible light microscopy (VLM), transmission electron microscopy (TEM), matrix dissolution, small angle neutron scattering (SANS) and hardness measurement has been employed to investigate the evolution of microstructure, hardness and precipitate composition, size and volume fraction. Results show that recrystallization is completed after annealing 8 h at 650 °C and 30 min at 700 °C. Three types of precipitates were identified: large Ti(C,N), medium-size (Ti,V)(C,N) and small (Ti,V)C. The Ti/(Ti+V) atomic ratio in the (Ti,V)C precipitates decreases with increasing radius in the 1–15 nm range, which can be explained by the initial nucleation of a TiC-rich core. The average size of the (Ti,V)C precipitates increases, whereas the number density decreases during annealing. The volume fractions of the three types of precipitates were separately determined by the matrix dissolution method. The volume fractions of (Ti,V)C precipitates obtained by matrix dissolution are comparable even slightly more accurate than those obtained by SANS. The hardness first increases and then decreases when annealing at both temperatures, which can be correlated well with the observed microstructural and precipitate evolution.
AB - A cold-rolled Ti-V high strength low alloy (HSLA) steel was isothermally annealed at 650 °C and 700 °C for different times. A unique combination of techniques including visible light microscopy (VLM), transmission electron microscopy (TEM), matrix dissolution, small angle neutron scattering (SANS) and hardness measurement has been employed to investigate the evolution of microstructure, hardness and precipitate composition, size and volume fraction. Results show that recrystallization is completed after annealing 8 h at 650 °C and 30 min at 700 °C. Three types of precipitates were identified: large Ti(C,N), medium-size (Ti,V)(C,N) and small (Ti,V)C. The Ti/(Ti+V) atomic ratio in the (Ti,V)C precipitates decreases with increasing radius in the 1–15 nm range, which can be explained by the initial nucleation of a TiC-rich core. The average size of the (Ti,V)C precipitates increases, whereas the number density decreases during annealing. The volume fractions of the three types of precipitates were separately determined by the matrix dissolution method. The volume fractions of (Ti,V)C precipitates obtained by matrix dissolution are comparable even slightly more accurate than those obtained by SANS. The hardness first increases and then decreases when annealing at both temperatures, which can be correlated well with the observed microstructural and precipitate evolution.
KW - High strength low alloy steel
KW - Matrix dissolution
KW - Precipitate
KW - Small angle neutron scattering
KW - Titanium‑vanadium-carbide
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=85083295184&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2020.108720
DO - 10.1016/j.matdes.2020.108720
M3 - Article
AN - SCOPUS:85083295184
VL - 192
JO - Materials & Design
JF - Materials & Design
SN - 0264-1275
M1 - 108720
ER -