论文部分内容阅读
研究了650℃下退火时间对冷轧Fe-0.14C-5Mn钢的组织结构和力学性能的影响规律,利用SEM进行了组织结构表征,采用XRD法测量了残留奥氏体量,通过拉伸试验机测试了钢的单轴拉伸性能。结果表明,退火过程中发生奥氏体逆转变,退火1min以后即形成20%以上的亚稳奥氏体;随退火时间的延长,抗拉强度(Rm)逐渐升高,屈服强度逐渐降低;断后伸长率(A)和强塑积(Rm×A)先升高而后降低,在650℃退火10 min时塑性(46%)和强塑积(46 GPa%)获得最大值。分析认为高含量亚稳奥氏体相的TRIP效应以及超细的晶粒尺寸是获得超高强度、超高塑性及高的强塑积的主要原因。
The effect of annealing time at 650 ℃ on the microstructure and mechanical properties of cold-rolled Fe-0.14C-5Mn steel was investigated. The microstructure and mechanical properties were characterized by SEM. The residual austenite content was measured by XRD. The tensile test The machine tested the uniaxial tensile properties of the steel. The results show that the austenite reverse transformation occurs during the annealing process and the metastable austenite forms more than 20% after annealing for 1 min. With the extension of annealing time, the tensile strength (Rm) gradually increases and the yield strength decreases gradually. The elongation (A) and the plastic mass (Rm × A) increase first and then decrease. The plasticity (46%) and the maximum plastic modulus (46 GPa%) are obtained when annealed at 650 ℃ for 10 min. It is believed that the TRIP effect of high-content metastable austenite phase and the ultra-fine grain size are the main reasons for obtaining super high strength, super-high plasticity and high strength plasticity.