51CrV4弹簧钢相变规律研究  

Phase transformations on 51CrV4 spring steels

作　　者：罗迪强[1] 赖朝彬[1] 彭园龙 谢飞鸣 王艳林 章庆 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]方大特钢科技股份有限公司,南昌330012

出　　处：《有色金属科学与工程》2016年第5期61-66,共6页Nonferrous Metals Science and Engineering

基　　金：江西省科技支撑计划项目(20141BBE50002)

摘　　要：利用Gleeble-3800热模拟机研究51CrV4弹簧钢过冷奥氏体连续转变规律,采用热膨胀法测定其相变临界点,同时测定51CrV4钢过冷奥氏体在不同冷却速度下连续转变时的膨胀曲线,绘制其静态连续冷却转变（CCT）曲线.结合金相-显微硬度法,分析不同冷却速度对51CrV4钢组织性能的影响.结果表明：冷却速度为0.5℃/s时,冷却转变的产物为铁素体和珠光体;当冷速增加,达到1℃/s后,贝氏体开始生成;马氏体转变冷速区间为2-30℃/s;当冷却速度超过12℃/s后,冷却产物只有马氏体.The static continuous cooling transformation（CCT） curves were measured using thermal expansion m ethod in a Gleeble-3800 thermo-mechanical simulator for 51 CrV4 steel. The expansion curves of supercooled a ustenite during continuous cooling under different cooling rate were determined. With metallographic microhardness method, the effect of different cooling rate on microstructure and performance of 51 CrV4 steel was analyzed. The results show that the phases resulted from the cooling transformation are ferrite and pearlite with the cooling at 0.5 ℃/s. With the cooling rate at 1 ℃ /s, the bainite is obtained. The cooling rate region for getting martensite is between 2 to 30 ℃/s. When cooling rate is up to 12 ℃/s, the product of the cooling transformation is only martensite.

关 键 词：51CrV4弹簧钢 过冷奥氏体 CCT曲线 组织性能 

分 类 号：TG142.41[一般工业技术—材料科学与工程]