变形方式对含ZrC粒子20Mn2钢晶粒细化的影响  

Effect of Deforming Method on Grain-refining in 20Mn2 Steel Containing ZrC Particles

作　　者：邓小铁[1] 刘志义[1] 郑青春[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《材料导报》2005年第8期128-131,共4页Materials Reports

基　　金：国家自然科学基金(59971031)

摘　　要：研究了恒温压缩与降温轧制对含 ZrC 粒子20Mn2钢晶粒细化的影响。结果表明,在奥氏体再结晶温度区间(1150℃、1050℃)和形变诱导铁素体相变温度区间(950℃、900℃、870℃、850℃),20Mn2钢的晶粒尺寸均能细化至3～4μm;在1150～870℃的降温轧制中,20Mn2钢的晶粒尺寸细化至1～3μm。分析表明,由于 ZrC 粒子的形变核心和再结晶核心的作用,含 ZrC 粒子的20Mn2钢在高温下(1150℃、1050℃)和较低温度下(950℃、900℃、870℃、850℃),变形的晶粒组织分别因奥氏体再结晶和形变诱导铁素体相变及其再结晶而得到细化;在降温轧制时,由于综合了高温奥氏体再结晶和低温形变诱导铁素体相变及其再结晶的细化晶粒效应,而最终获得的晶粒尺寸比恒温变形的更小。The effects of pressing at a constant temperature and roiling with temperature decreasing on grainrefining in 20Mn2 steel containing ZrC particles are investigated. Results show that either deforming at the temperature range of austeninte recrystallization（ 1150℃, 1050℃）or deformation induced ferrite phase transformation（950℃ ,900℃, 870℃, 850℃ ）, the grain size in 20Mn2 steel can be refined to 3-4μm- and in the process of decrasing-temperature rolling, the grain size is refined to 1-3μm. Analyses indicate that because of role of ZrC as deforming nucleus and recrystallizing nucleus, the grains of 20Mn2 steel deformed at higher temperature（1150℃, 1050℃）and lower temperature （950℃, 900℃, 870℃, 850℃）are refined respectively by austenite recrystallization and deformation induced ferrite transformation and recrystallization; when rolled with temperature decreasing, the grain size obtained at last pass of rolling is smaller than that deforming at a constant temperature because of summing up the effects of grain-refining due to austenite recrystallization and deformation induced ferrite transformation and recrystallization.

关 键 词：变形 钢 晶粒细化 ZRC粒子 再结晶 形变诱导铁素体相变 20MN2钢 变形方式 奥氏体再结晶 再结晶温度 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG142.1[金属学及工艺—金属材料]