Abstract: The 0. 14C-5Mn steel (/%: 0. 14C, 5. OMn, 0. 008P, 0. 002S, 0. 003 ON) is melted by a 50 kg vacuum induction furnace and roiled to 4 mm pate (finishing temperature 1 000 °C, air cooling). The structure and mediatic properties of 4 mm plate of 0. 14C-5Mn steel annealed at 550 ~ 650 °C for 6h are studied by scanning electron microscope, X-ray diffraction analysis and uniaxial tensile test. Results show that the austenite is produced in annealing process of 0. 14C-5Mn steel (occurring transformation-induced plasticity-TRIP effect), and with increasing annealing temperature the volume fraction of austenite increases and the elongation and product of tensile strength to elongation increase obviously. With annealing at 650 °C for 6 li the austenite fraction in steel is up to 30. 11%, the tensile strength of steel is 945 MPa and the product of tensile strength to elongation is 37. 3 GPa%.

摘要： 0.14C-5Mn钢(/%:0.14C、5.0Mn、0.008P、0.002S、0.0030N)由50 kg真空感应炉冶炼,轧成4 mm板材(终轧温度1000℃,空冷)用扫描电子显微镜,X射线衍射法和单轴拉伸试验研究了0.14C-5Mn钢热轧4 mm板550～650℃ 6 h退火后的组织和力学性能。结果表明,热轧0.14C-5Mn钢退火过程中产生了奥氏体(发生相变诱发塑性-TRIP效应),随退火温度的升高,奥氏体体积分数逐渐增加,钢的伸长率和强塑积(抗拉强度与断后伸长率的乘积)明显增加,650℃ 6 h退火时奥氏体体积分数达30.11%,该钢的抗拉强度为945 MPa,强塑积为37.3 GPa%

关键词:  0.14C-5Mn钢, 退火, 奥氏体, 逆相变, 力学性能