X100管线钢亚稳奥氏体组织演变动力学  

Kinetics of metastable austenite transformation in X100 pipeline steel

作　　者：齐亮[1] 胡义锋[1] 张迎晖[1] 刘同华[1] 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州34100

出　　处：《材料热处理学报》2013年第11期93-98,共6页Transactions of Materials and Heat Treatment

基　　金：国家"十一五"科技支撑计划(2006BAE03A06);江西省教育厅项目(gjj1145)

摘　　要：采用Gleeble-3500热模拟试验机进行了X100管线钢两阶段控制轧制及轧后控冷工艺模拟，研究冷速、精轧变形量及等温温度对亚稳态奥氏体相变规律影响。结果表明：实验钢在试验冷速范围内组织由块状铁素体、粒状贝氏体和板条贝氏体构成；随着冷速增加，奥氏体转变百分率曲线左移，最快相变温度下降，转变速率增加；随着精轧变形量增大，A。显著提高，奥氏体转变百分率曲线右移，转变速率变化较小。X100管线钢等温温度在400—450℃范围内组织以粒状贝氏体为主，降低至350℃时组织以板条贝氏体为主。Effecs of cooling rate, deformation degree and isothermal temperature on kinetics of phase transformation and microstructure evolution in an X100 pipeline steel were researched on a Gleeble-3500 thermo-mechanical simulator. The results show that microstructure of the tested steel is composed of massive ferrite, granular bainite and lath bainite in the range of experiment cooling rate. With the increasing of cooling rate, the curves of austenite transformation fraction shift left, the temperature of phase transition with the fastest rate is reduced, meanwhile, the transformation rate increases. With finish rolling deformation degree increasing, Aa increases significantly, and the transformation percentage curve move to right slowly, but the transformation rate changes slightly. The microstrueture of the tested steel is mainly composed of granular bainite when isothermal temperature is in the range of 400--450 ℃ , while mainly lath bainite when the temperature is reduced to 350 ℃.

关 键 词：管线钢 亚稳奥氏体 粒状贝氏体 马奥岛 动力学 

分 类 号：TG142.4[一般工业技术—材料科学与工程]