赵金华,胡文莉,王学强,康健,袁国,邸洪双

• 1:东北大学轧制技术及连轧自动化国家重点实验室
• 2:首钢股份迁安钢铁有限公司

摘要(Abstract)：

针对厚规格X80管线钢,采用SEM、EBSD、TEM等方法,研究了不同超快冷终冷温度下厚规格管线钢显微组织演变规律及强韧化机制,并进一步给出了最佳超快冷工艺参数。结果表明,在相同控轧条件下,随着超快速冷却温度由650℃降低至350℃,显微组织经历了由AF+QF+GB+DP向AF+GB的转变,沿厚度方向组织均匀性得到改善,有效晶粒尺寸减小,铁素体板条亚结构细化;当超快速冷却温度为350℃时,沿厚度方向组织均匀性最优,有效晶粒尺寸及板条亚结构尺寸最小,分别为3.83μm及300~900 nm间,材料的主要强化机制为细晶强化与相变强化的综合强化,此时实验钢综合力学性能最优,拉伸、冲击力学性能均满足ASTM A370标准;实验钢轧后超快速冷却最佳工艺参数为:810℃精轧+超快冷至350~400℃+层流冷却至320~360℃+卷取。

关键词(KeyWords)： 超快冷;厚规格管线钢;针状铁素体;热轧工艺

Abstract:

Keywords:

基金项目(Foundation): 国家科技支撑计划(2012BAF04B00);; 国家自然科学基金(51504063)

作者(Author): 赵金华,胡文莉,王学强,康健,袁国,邸洪双

DOI: 10.13289/j.issn.1009-6264.2016.05.016

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