Formation of Intragranular Ferrite during Isothermal/Thermomechanical Processes in a Medium Carbon V-Ti-N Microalloyed Steel
For a V-Ti-N microalloyed steel with 0.34％C-1.54％Mn, intragranular ferrite (IGF) was obtained in both isothermal austenite decomposition processes and thermomechanical processes simulating the industrial seamless tubing manufacture process. Results show that with decrease of the isothermal temperature in range of 600 ℃ down to 450 ℃ not only the morphology of IGF changed from equiaxed to acicular, but also the equiaxed IGF and the acicular IGF were refined. More importantly, it is found that the amount of equiaxed ferrite increased significantly in the thermomechanical process sample water quenched from 550 ℃ after 800 ℃ deformation than that in the isothermally treated sample at 550 ℃ sample without hot deformation. It implies that appropriate controlled deformation with controlled cooling can significantly promote equiaxed IGF formation, and not solely rely on nucleation mechanisms related with inclusions. Hot deformation of austenite without dynamic and complete static recrystallization causes high energy regions, therefore further promotes the nucleation potency of IGF.
V-Ti-N microalloyed steel intragranular ferrite (IGF) isothermal treatment thermomechanical processes controlled cooling
XU Lei LIU Guo-quan NIE Yu-zhu WANG Xue-hui MA E
Hebei Iron & Steel Technology Research Institute, Shi Jiazhuang, Hebei 050021, China School of Materials Science and Engineering / State Key Laboratory for Advanced Metals and Materials
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
794-798
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）