Effect of Niobium on Microstructure of X80 Grade Pipe Line Steel
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摘要: 利用金相和透射电镜等分析手段对不同Nb含量的高强度X80管线钢的显微组织进行了分析，并利用萃取复型方法重点研究了两种钢中二次相粒子的析出行为。研究结果表明，低铌管线钢的显微组织主要由粒状贝氏体、板条贝氏体及少量M-A岛组成，而高铌管线钢中的主要组织为针状铁素体和M-A组元。析出相萃取复型分析结果表明，低铌管线钢中主要析出相为方形TiN粒子，而高铌钢中的析出相粒子主要由大尺寸的（Nb，Ti） C复合型粒子及大量弥散分布的小尺寸NbC组成。Abstract: Microstructure of high strength X80 pipeline steels which contain different Nb contents was investigated using optical microscopy and transmission electron microscopy.Second phase particles were analyzed by extraction replica method.Results show that microstructure of low Nb content steel comprises granular bainite and Lath-like bainite,and a few of martensite-austenite（M-A） islands.However,microstructure is consisted of fine acicular ferrite and M-A islands in high Nb content steel.Precipitates in low Nb pipeline steel are large scale cubic TiN particles,however,precipitates of high Nb pipelines steel are mainly the large size duplex type（Nb,Ti）C and fine NbC precipitates.
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Key words:
- pipeline steel /
- Nb /
- microstructure /
- low bainite /
- acicular ferrite /
- precipitate
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