Effect of isothermal annealing on Nano Ti-carbides precipitation
Transmission electron microscopy was used to investigate the effect of isothermal holding temperature and time on the nano Ti-precipitates. A holding temperature was varied systematically from 400℃ to 1200℃. The isothermal holding was continued for 30s, 300s and 900s, respectively. Nano carbides of (Ti, Nb)C were precipitated significantly at 900℃. The size of carbides was approximately 10nm at 30s holding and increased to 20～30nm at 900s holding.Isothermal holding at 1000oC showed the increased amount of carbides larger than 100nm. At 800℃, nano (Ti, Nb)C was not observed at 30s and it was examined at 300s. The size of nano (Ti, Nb)C was smaller than that of 900℃. As the isothermal temperature decreased to 700℃, the nano (Ti, Nb)C was only seen at 900s holding and the size of carbides was smaller than 10nm. Nano (Ti, Nb)C was disappeared at isothermal holding below 600℃. The kinetics of nano (Ti,Nb)C precipitation were studied as a function of isothermal holding temperature and time, respectively, using the precipitate growth equations.
Ti carbide Hot rolled steel Hole expansion ratio Isothermal holding Nano precipitates
Cheol-ho Park Woo-jin Kim Nam-hyun Kang Hyung-hyup Do Kyung-Mox Cho
Department of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea Technical Research Laboratories, Hyundai steels, Dangjin, Chungnam 343-711, Korea
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
411-413
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）