低碳贝氏体钢组织的稳定性研究  

Study on Microstructure Stability of Low Carbon Bainitic Steel

作　　者：蔡茗宇 王永 周起 贾保祯 刘朝振 蔡瑞涛 Cai Mingyu;Wang Yong;Zhou Qi;Jia Baozhen;Liu Zhaozhen;Cai Ruitao(Medium and Heavy Plate Rolling Plant of Shandong Steel Group Rizhao Co.,Ltd.)

机构地区：[1]山东钢铁集团日照有限公司中厚板厂

出　　处：《宽厚板》2023年第1期10-13,共4页Wide and Heavy Plate

摘　　要：通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和内耗实验等手段,观察、分析低碳贝氏体钢在受热扰动过程中的显微组织和屈服强度变化。结果表明,随着热扰动的进行,屈服强度先提高、后降低;贝氏体板条的宽度不断增加,板条内部出现胞状亚结构,板条逐步演化为颗粒状;Mo_(2)C和NbC析出物进一步增多并逐渐粗化,组织中的位错密度不断降低;内耗-温度谱中Snoek峰值不断降低,表面处的SKK峰值先降低后升高。贝氏体的稳定性与位错运动有较大关系。By means of SEM,TEM,XRD and internal friction measurement,the changes of microstructure and mechanical properties of low carbon bainitic steel in the process of thermal disturbance are observed and analysed.The results show that with the proceeding of thermal disturbance,the yield strength first increases,then decreases.The bainite lath becomes wider,cellular substructures appear inside the lath,and the lath gradually evolves into granulars.The precipitates of Mo_(2)C and NbC further increase and gradually coarsen,and the dislocation density decreases continuously.The Snoek peak value in the internal friction-temperature spectrum decreases continuously,the SKK peak value at the surface first decreases and then increases.The stability of bainite is closely related to dislocation motion.

关 键 词：热扰动 贝氏体形貌 碳化物 位错密度 内耗 

分 类 号：TG142.1[一般工业技术—材料科学与工程]