锻压技术

钢材混晶组织缺陷的形成机理及控制策略

英文标题：Formation mechanism and control strategy on mixed grain structure defect for steel

分类号：TG142.1

出版年,卷(期):页码：2023,48(7):1-6

摘要：

混晶是钢材极易产生的一种内部组织缺陷，对于钢材的微观组织和综合力学性能有很大损害。消除混晶缺陷，实现组织均匀化控制是提升钢材综合性能的必然要求。首先明确了混晶的概念及其定量分析评价方法；其次结合已有的研究基础从钢材变形和加热过程出发揭示了混晶组织缺陷的形成机理，依据成因将其分为4类混晶组织以阐述混晶的特征，包括热变形时部分再结晶引起的混晶、低于临界变形量形变引起的混晶、组织均匀的钢材二次加热后出现的混晶和加热时异常不均匀长大引起的混晶；最后针对性地提出了有效控制策略，对于钢材生产过程提供理论性指导。

Mixed grain is an internal microstructure defect that is easily produced in steel, which has great damage to the microstructure and comprehensive mechanical properties of steel. Eliminating mixed grain defect and realizing microstructure homogenization control are the inevitable requirements for improving the comprehensive performance of steel. Therefore, firstly, the concept of mixed grain and its quantitative analysis and evaluation method were clarified. Secondly, the formation mechanism of mixed grain structure defect was revealed from the deformation and heating process of steel combined with the existing research basis. Then, according to the causes, the characteristics of mixed grain were described in four kinds of categories, including the mixed grain caused by the partial recrystallization during thermal deformation, the mixed grain caused by the deformation below the critical deformation amount, the mixed grain after reheating of steel with uniform structure and the mixed grain caused by the abnormal uneven growth during heating. Finally, the effective control strategies were proposed to provide theoretical guidance for steel production process.

基金项目：

河北省重大科技成果转化专项项目（22281004Z）；河钢集团重点科技项目计划（HG2022114）

郝彦英（1971-），女，硕士，教授级高级工程师 E-mail：cnhao1999@126.com 通信作者：张朝磊（1984-），男，博士，副教授 E-mail：zhangchaolei@ustb.edu.cn

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