周乐育,李明扬,刘雅政,袁付春

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

研究了终轧温度、冷却速度和卷取温度等工艺参数对具有不同Mo、Nb含量的非调质CT80连续油管用钢组织性能的影响。结果表明,满足其强韧性要求的组织特征为针状铁素体和贝氏体复相组织,且弥散分布约4%的细小M/A岛。终轧温度主要影响组织均匀性。当冷却速度由40～45℃/s提高到60～70℃/s后,铁素体形态转变为针状,其内部亚晶面积增加,位错密度升高。卷取温度影响复相组织中强化相的形态与分布。为避免珠光体或马氏体而促进贝氏体组织转变充分,卷取温度应约为450℃。Mo元素含量提高至0.24%可促进针状铁素体转变并形成细小的强化相M/A岛,起到良好的亚结构强化和相变强化效果。Mo和Nb含量的增加使得实验钢对冷速的敏感性明显降低,增强了非调质CT80连续油管用钢控冷过程工艺稳定性。

关键词(KeyWords)： 连续油管用钢;复相组织;冷却速度;卷取温度

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项资金资助(FRF-TP-12-046A)

作者(Author): 周乐育,李明扬,刘雅政,袁付春

DOI: 10.13289/j.issn.1009-6264.2013.05.017

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