轧制工艺对X100管线钢组织性能的影响
Effects of Rolling Process on Microstructure and Property of X100 Pipeline Steel
彭玲利1,2, 张丁非1, 刘清友2, 孙新军2
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作者单位：(1. 重庆大学 材料科学与工程学院, 重庆 400045; 2. 北京钢铁研究总院, 北京 100081)
中文关键字：X100管线钢； 显微组织； 显微硬度
英文关键字：X100 pipeline steel; microstructure; microhardness
中文摘要：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。
英文摘要：The rolling process for X100 pipeline steel was simulated on Gleeble-1500D thermo-mechanical simulator. The microstructure and property of the steel were studied by OM, SEM and micro-hardness tester. The results show that the microstructure of the steel is mainly composed of granular bainite and lower bainite with a little acicular ferrite. Decreasing the reduction of the finish rolling, final cooling temperature or relaxation time, bainite content in the microstructure of the steel increases and the microhardness rises. The high-microhardness (>300 HV) and strength (?垌700 MPa) are obtained by fining granular bainite. It is feasible to obtain the strength of X100 pipeline steel by controlling the grain bainite.