北京科技大学学报2013，Vol.35Issue(3)：319-324,6.
连续退火的无Si TRIP钢的组织和力学性能
Mechanical properties and microstructure of continuous annealing TRIP steel without Si
摘要
Abstract
A kind of TRIP steel without Si was heat-treated on a Gleeble3500 thermal simulation testing machine. Its mechanical properties, microstructure, and phase transformation were studied by tensile machine, scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and thermal dilatometer. The effects of bainite transformation temperature and time on the mechanical properties and retained austenite in the Si-free TRIP steel were analyzed. It is found that the Si-free TRIP steel has excellent overall mechanical properties with the tensile strength of 740 to 810 MPa and the elongation above 25%, which can reach up to 32%. The best comprehensive mechanical properties can be achieved when the isothermal bainite transformation temperature is 420 ℃. At this temperature, the tensile strength decreases and the elongation increases with the increase of bainite transformation time, but the yield strength has no significant change. The size of ferrite grains in the Si-free TRIP steel is 3 to 4 urn, smaller than that in the Si-containing TRIP steel. The volume fraction of retained austenite is 8% to 10%, about 3% lower than that in the Si-containing TRIP steel. Bainite transitions in the Si-free TRIP steel almost complete at 420 ℃ for 300 s, but the diffusion of C still continues. Compared to the Si-containing TRIP steel, bainite transitions in the Si-free TRIP steel are much faster and the bainite transformation amount is bigger.关键词
TRIP钢/硅/力学性能/微观组织/相变Key words
TRIP steel/ silicon/ mechanical properties/ microstructure/ phase transitions分类
矿业与冶金引用本文复制引用
定巍,龚志华,唐获,江海涛,王宝峰..连续退火的无Si TRIP钢的组织和力学性能[J].北京科技大学学报,2013,35(3):319-324,6.基金项目
国家自然科学基金资助项目(50804005) （50804005）
