配分时间对低碳热轧F-Q&P钢组织和性能的影响

采用二辊可逆轧机,研究了弛豫-淬火配分(F-Q&P)工艺中配分时间对试验钢组织及力学性能的影响。研究表明,在弛豫-淬火配分(F-Q&P)工艺下,试验钢的组织主要以多边形铁素体、板条马氏体和残留奥氏体组成;当配分时间延长,试验钢的强度降低,屈强比先降低后升高,伸长率增加,加工硬化指数n值和残留奥氏体含量先增加后下降。进行60 s配分后,试验钢有最低的屈强比和最高的n值,分别为0.62和0.12,抗拉强度和伸长率分别为1090 MPa和19.0%, 力学性能最佳。

Effect of partitioning time on microstructure and properties of low carbon hot rolled F-Q&P steel

Using a two-high reversing mill, effect of partitioning time of the relaxation-quenching partition (F-Q&P) process on microstructure and mechanical properties of tested steel was studied. The results show that under the relaxation-quenching partitioning (F-Q&P) process, the microstructure of the tested steel is mainly composed of polygonal ferrite, lath martensite and retained austenite. When the partitioning time is prolonged, the strength of the tested steel decreases, the yield ratio first decreases and then increases, the elongation increases, and the hardening index n value and the retained austenite content first increase and then decrease. After partitioning for 60 s, the tested steel has the lowest yield ratio and highest n value, 0.62 and 0.12, respectively, and the tensile strength and elongation are 1090 MPa and 19.0%, respectively, the mechanical properties are optimum.