ZrC粒子对C-Mn钢形变诱导相变晶粒细化的影响  

Effect of addition of ZrC particles on grain refining of low carbon steel during deformation induced ferrite transformation

作　　者：匡建新[1] 唐明华[1,2] 刘志义[2] 邓彬[1] 

机构地区：[1]湖南工学院机械工程系,湖南衡阳421002 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料热处理学报》2011年第4期70-75,共6页Transactions of Materials and Heat Treatment

基　　金：湖南省自然科学衡阳联合基金项目(10JJ9022)

摘　　要：采用外部压入法制备含ZrC粒子的低碳钢,分析了ZrC粒子在试验钢中的固溶析出特点,研究了ZrC粒子对奥氏体晶粒长大及形变诱导相变铁素体晶粒细化的影响。结果表明:试验钢中存在一定数量尺寸较大弥散分布的ZrC粒子,这些粒子具有很高的稳定性,在热加工过程中,这些粒子能明显改变奥氏体晶界的状态,细化初始奥氏体晶粒,显著地阻止奥氏体晶粒的长大;在应变条件下,外加ZrC粒子能够提高形变诱导相变开始温度约40℃,ZrC/奥氏体相界面由于成为了聚集形变能的缺陷,因而加速形变诱导相变的进程,提高铁素体形核率,导致铁素体晶粒细化;在相同的变形条件下,添加了ZrC粒子的试验钢较未加ZrC粒子的钢有更好的晶粒细化效果。In order to deeply understand the effect of ZrC particles on ferrite grain refinement during deformation induced ferrite transformation,the low carbon steel containing ZrC particles was fabricated by external addition method and the characteristics of solid solution and precipitation of ZrC particles in the tested steel were analysised and the influence of ZrC particles on austenite grain growth and ferrite grain refinement were studied.The results show that the added ZrC particles exist are dispersively distributed in the tested steel,those particles are very stable and can be significantly change the state of the austenite grain boundaries,refine the initial austenite grain,inhibit austenite grain coarsening effectively during thermal processing.In the strain conditions,the ZrC particles increase the deformation-induced phase transition starting temperature by 40 ℃,and ZrC/austenite interface as defects of strain energy accumulation accelerates the deformation-induced phase trasformation process,and increase the ferrite nucleating rate,leading to ferrite grain refinement.In the same deformation conditions,the tested steel adding ZrC particles exhibits a better effect of grain refinement than the steel without ZrC particles.

关 键 词：ZRC粒子 C-MN钢 形变诱导铁素体相变(DIFT) 晶粒细化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]