超低碳微合金管线钢中针状铁素体的组成对强度的影响  

EFFECT OF ACICULAR FERRITE CONSTITUTION ON STRENGTH OF ULTRALOW-CARBON MICRO-ALLOYED PIPELINE STEEL

作　　者：王伟[1] 单以银[1] 杨柯[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《金属学报》2007年第6期578-582,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50471106;辽宁省科技攻关项目2005221002资助~~

摘　　要：利用控轧控冷工艺,在超低碳微合金管线钢中获得了不同组成比的针状铁素体复相组织,并对其复杂的组织进行了定量金相研究,探讨了组织组成比与材料强度的关系,研究结果表明,降低终轧温度,提高冷却速度均导致管线钢强度的显著提高,归功于针状铁素体复相组织中的粒状铁索体、贝氏体铁索体等低温组织含量的增加;低温组织含量的增加比提高卷取温度导致的沉淀析出增多对强度提高的贡献更大．By using thermo-mechanical controlled processing （TMCP）, the acicular ferrite （AF） consisted of different phase constitutions was obtained in an ultralow-arbon micro-alloyed pipeline steel; the effect of phase constitution in AF, which was analysed by quantitative metallography, on the strength was investigated. The results showed that lowering the finish rolling temperature or enhancing the cooling rate obviously improved the strength of the steel, due to increasing of the percentage of granular ferrite and balnitic ferrite in AF; which makes more contribution to the increase of strength than increasing precipitates by enhancing the coiling temperature.

关 键 词：管线钢 针状铁素体 定量金相 控轧控冷工艺 显微组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335.1[金属学及工艺—金属材料]