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。
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（■700 MPa） are obtained by fining granular bainite.It is feasible to obtain the strength of X100 pipeline steel by controlling the grain bainite.
出处
《热加工工艺》
CSCD
北大核心
2010年第10期1-4,101,共5页
Hot Working Technology
基金
国家"十一五"科技支撑计划重点项目(2006BAE03A15)
