摘要
利用金相显微镜、扫描电镜、透射电镜等研究了2种成分的X100管线钢的力学性能、显微组织、晶粒取向及析出物。试验结果表明,采用高铌+钼组合不含硼的X100管线钢更易在高强度和良好低温韧性之间获得平衡,通过控轧控冷工艺研发出的X100管线钢具有粒状贝氏体、针状铁素体和少量下贝氏体的最优化组织,铁素体晶粒尺寸约3μm,钢中大量弥散的纳米级析出物和高密度位错也起到了良好的强化作用。
The mechanical properties,microstructure,grain orientation and precipitates of the pipeline steel X100 with two different chemical compositions were investigated by means of metalloscope,SEM and TEM,etc.The experimental results showed that the X100 pipeline steel made from high niobium + molybdenum chemical constitution design was prone to obtain balance between strength and ductility.The X100 pipeline steel developed through TMCP had optimal structure consisting of granular bainite,acicular ferrite and less lower bainite,and the ferrite grain size was 3 μm approximately.In addition,nanometer precipitates and high-density dislocation in pipeline steel also hardened the parent material actively.
出处
《中国冶金》
CAS
2012年第9期20-25,共6页
China Metallurgy
关键词
管线钢X100
高铌+钼
最优化组织
析出物
pipeline steel X100
high niobium + molybdenum
optimal Structure
precipitate
