周莹涛,丁文红,彭冲,陈浩,唐小勇,龚红根

• 1:武汉科技大学耐火材料与冶金国家重点实验室
• 2:新余钢铁股份有限公司

摘要(Abstract)：

连续冷却过程中的相变行为是决定淬火残余应力的关键要素。通过相变行为研究和显微组织观察研究了X510L钢连续冷却转变动力学规律。结果表明：冷速是决定相变动力学最关键的影响因素。随冷速增大，铁素体相变开始温度降低，相变时间缩短，且前期转变快于后期。建立了考虑冷速的铁素体相变动力学模型：ξ=1-exp[-b(F_s-T)~(f(v))],弥补了传统相变动力学方程不考虑冷速影响的缺陷，模型中材料参数n对相变过程的影响更显著。运用上述相变动力学方程，结合现场实际冷却工艺分析X510L钢翘曲缺陷形成的原因，提出了基于铁素体钢翘曲控制的F7出口速度与冷速的匹配原则，并确定当F7出口速度为8 m/s时，将冷速范围设定为14.3～20℃/s可以避免X510L钢出现翘曲缺陷。借鉴上述方法，可以避免铁素体钢由于冷速设定不合理所导致的翘曲缺陷。

关键词(KeyWords)： X510L钢;动态CCT;相变动力学;翘曲;残余应力;临界冷速

Abstract:

Keywords:

基金项目(Foundation): 湖北省技术创新专项重大项目(2018AAA005)

作者(Author): 周莹涛,丁文红,彭冲,陈浩,唐小勇,龚红根

DOI: 10.13289/j.issn.1009-6264.2022-0573

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