加热速率对20MnSi钢相变速率及正火组织的影响  

Effect of Heating Rate on Phase Change Rate and Normalizing Microstructure of 20MnSi Steel

作　　者：马英伟 宁保群[1,2] 

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]天津大学材料科学与工程学院,天津300072

出　　处：《热加工工艺》2018年第2期50-52,56,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51104107);天津市自然科学基金项目(12JCYBJC11800)

摘　　要：采用高精度差分膨胀仪对不同加热速率（5-3000℃/min）下20Mn Si钢的奥氏体化过程进行研究。结果表明：随加热速率的增大,奥氏体化速率显著增大,奥氏体形成所需的时间明显缩短。加热速率影响了正火过程中过冷奥氏体的相变行为,从而影响了钢材的组织。The austenization process of 20 Mn Si steel was studied by high-resolution differential dilatometer in a wide heating rate range of 5-3000 ℃/min. The results show that with the heating rate increasing, the austenitization rate significantly increases. The time for the formation of austenite significantly reduces. The heating rate significantly affects the phase transition behavior of supercooled austenite in the process of normalizing, and then, the microstructure of the steel is affected.

关 键 词：20Mn Si钢 膨胀曲线 加热速率 奥氏体化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]