赵金华,侯耀武,袁国,王学强,邸洪双

• 1:太原科技大学材料科学与工程学院
• 2:航空工业陕西宏远航空锻造有限责任公司
• 3:东北大学轧制技术及连轧自动化国家重点实验室

摘要(Abstract)：

采用高分辨热膨胀相变仪对高冷速下X80管线钢等温相变行为进行了研究,利用扫描电镜(SEM)、透射电镜(TEM)对不同相变条件下实验钢微观组织、亚结构进行了表征。基于膨胀量变化规律及微观组织特征,讨论了不同等温相变条件下过冷奥氏体组织演变规律,并进一步给出了高温卷取关键冷却工艺。结果表明,在40℃/s冷却速率下,当等温温度由580℃降低至370℃时,实验钢相变开始温度为621.1～624.5℃;等温温度为580℃时,等温过程过冷奥氏体相变不完全,相变产物为针状铁素体(AF)+贝氏体铁素体(BF)+板条贝氏体(LB)的混合组织;当等温温度降低至510、440及370℃时,实验钢相变产物为AF+BF+M/A岛的复相组织,LB消失,且随着相变温度降低M/A岛体积分数及尺寸均减小。对于X80管线钢而言,需保证控制冷却过程中终冷温度低于510℃,在避免过冷奥氏体相变不完全现象发生的同时,使组织保持以AF+BF+细小M/A岛的复相组织特征。

关键词(KeyWords)： X80管线钢;高冷速;针状铁素体;热轧工艺

Abstract:

Keywords:

基金项目(Foundation): 山西省来晋优秀博士科研资助项目(20192041);; 太原科技大学博士科研启动基金项目(20182007)

作者(Author): 赵金华,侯耀武,袁国,王学强,邸洪双

DOI: 10.13289/j.issn.1009-6264.2020-0088

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