锰对免常化中牌号无取向硅钢热变形行为的影响  

Effect of Mn on hot deformation behavior of medium grade non-oriented silicon steel without normalizing process

作　　者：王永强[1] 陆勤阳 李娜 左锐 裴英豪[3] 郑成思 WANG Yongqiang;LU Qinyang;LI Na;ZUO Rui;PEI Yinghao;ZHENG Chengsi(School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243002,Anhui,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243002,Anhui,China;Technology Center,Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000,Anhui,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽工业大学冶金工程学院,安徽马鞍山243002 [3]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《钢铁》2024年第4期136-147,共12页Iron and Steel

基　　金：安徽省重点研究与开发计划资助项目(202104a05020021);国家自然科学基金资助项目(51971003,51604002)。

摘　　要：无取向硅钢免常化生产具有重要的节能降耗、低碳低成本意义,其实现需要合金成分的优化设计,Mn合金化是一种潜在的有效策略,但目前Mn在无取向硅钢热变形过程中的作用尚需全面认识。利用热力学相图计算、热模拟、组织表征分析等手段,研究了Mn含量对1.5%Si-0.3%Al无取向硅钢热变形行为的影响。建立了不同Mn含量试验钢的流变峰值应力本构方程,计算了热变形激活能和发生动态再结晶的临界应变与峰值应变的关系,分析了不同变形条件下不同Mn含量试样的再结晶率和晶粒尺寸。结果表明,Mn含量越高,试样的热变形激活能越大;相同变形条件下,Mn含量越高,试样的流变应力越大,但发生动态再结晶的临界应变与峰值应变的比例却降低;此外,Mn含量越高,试样中动态再结晶的比例越高,即Mn元素促进动态再结晶的发生,这对无取向硅钢的免常化生产有利。在变形温度下Mn含量越高,试验钢中的奥氏体含量越多,基体中固溶的Mn原子也越多。这一方面使得试样的变形抗力越大,热变形激活能越大、流变应力越大;另一方面,由于奥氏体层错能低,位错移动性较差、攀移或交滑移比较困难,动态回复受限,形变储存能可有效累积;再者,由于固溶原子更多,晶格畸变更严重,对位错运动的阻碍和存储效果更明显,也有利于形变储存能的累积。因此,动态再结晶发生得更充分。The energy saving,low carbon emission and low-cost production will be come true when there is no normalization in the process of non-oriented electrical steel.This need to be optimal alloying design,Mn element could be a potential option.However,at present,the role of Mn element in the hot deformation of non-oriented electrical steel still needs comprehensive understanding.The effect of Mn on the hot deformation behavior of 1.5%Si-0.3%Al medium grade non-oriented electrical steel was investigated by the methods of thermodynamic phase diagram calculation,thermal simulation and microstructural characterization experiments.Rheological peak stress constitutive equations of specimens with different Mn content have been established and the critical strains of dynamic recrystallization in specimens have been calculated on the basis of constitutive equations.The grain size and volume fraction of recrystallization in specimens with different Mn content was also analysed.The results show that the more the Mn content,the higher the activation energy,in addition,the flow stress of specimens increased with the increase of Mn content on the same deformation condition,while,the ratio of critical strain to peak strain for dynamic recrystallization decreased.Moreover,the volume fraction of dynamic recrystallization in specimens improved with the increase of Mn content.It means that Mn element can promote the occurrence of dynamic recrystallization,which is beneficial for the production of non-oriented silicon steel without normalizing process.At the range of hot deformation temperatures,austenite phases in specimens increased with the increase of Mn content and the solid solution atoms in specimens increased too.This brings,on one hand,more harder austenite phases which offer more resistance to hot deformation,so the higher activation energy and flow stress are obtained.On the other hand,dislocations are less mobile and relative difficulty to climb or cross slip at high temperatures owing to the low stacking-fault energy in auste

关 键 词：Mn 无取向硅钢 热变形行为 本构方程 动态再结晶 

分 类 号：TG142.1[一般工业技术—材料科学与工程]