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运用Gleeble-1500D热模拟实验机模拟了X100管线钢的轧制过程,并且通过Leica MEF-4M型金相显微镜、HITACHIS-4500型扫描电镜和显微硬度计研究了不同工艺下实验钢的显微组织和力学性能的变化规律。结果表明:X100管线钢主要由粒状贝氏体和板条贝氏体组成。降低精轧变形量、终冷温度和弛豫时间,实验钢的显微组织中板条贝氏体含量增多,显微硬度增加。通过粒状贝氏体组织的细化就可以获得很高的硬度值(>300 HV),所换算的强度远远大于700 MPa。说明通过粒状贝氏体的控制获得X100管线钢的强度是可行的。
The rolling process of X100 pipeline steel was simulated by Gleeble-1500D thermal simulation machine, and the microstructure and mechanical properties of X100 pipeline steel were studied by Leica MEF-4M microscope, HITACHIS-4500 scanning electron microscope and microhardness tester Tissue and mechanical properties of the law of change. The results show that X100 pipeline steel mainly consists of granular bainite and lath bainite. Reducing the amount of finish rolling deformation, final cooling temperature and relaxation time, the microstructure of the experimental steel bainite content increased, the microhardness increases. High hardness values (> 300 HV) are obtained through refinement of the granular bainitic structure with a calculated strength far greater than 700 MPa. It is feasible to get the strength of X100 pipeline steel through the control of granular bainite.