摘要
为支撑46MnVS5非调质钢轧后控冷工艺的优化,及合理制定钢后热处理工艺,利用Gleeble3800热模拟机热膨胀法,结合组织及硬度检测分析,研究46MnVS5非调质钢过冷奥氏体连续冷却转变规律。试验测定了46MnVS5钢Ac1、Ac3、Ar1、Ar3平衡临界相变点温度,并测定了该钢种奥氏体连续冷却转变CCT曲线。结果表明,当冷速小于2℃/s时,组织转变为铁素体+珠光体;冷速≥2℃/s时,开始出现少量贝氏体和少量马氏体,组织转变为铁素体+珠光体+贝氏体+马氏体;冷速≥7℃/s时,主要转变为马氏体和贝氏体;冷速≥20℃/s时,组织转变为马氏体。通过研究,得到了不同冷速下46MnVS5钢奥氏体连续冷却转变规律,绘制了CCT曲线,为轧后控冷工艺优化提供试验数据支撑,同时支撑下游用户合理制定后续热加工冷却工艺。
In order to support the optimization of the controlled cooling process after rolling of non-quenched and tempered steel 46MnVS5,and to formulate the subsequent hot working cooling process reasonably,the thermal expansion method of Gleeble3800 thermal simulator was used,combined with the analysis of microstructure and hardness,to study the Austenite change rules of the steel in continuous cooling.The critical transformation point temperature of Ac1,Ac3,Ar1 and Ar3 of the steel was measured,and the CCT curve of Austenite continuous cooling transformation of the steel was measured.The results show that when the cooling rate is less than 2℃/s,the microstructure transforms into ferrite+pearlite;when the cooling rate is≥2℃/s,a small amount of bainite and martensite begins to appear,and the microstructure transforms into ferrite+Pearlite+Bainite+Martensite;when the cooling rate≥7℃/s,it mainly transforms into martensite and bainite;when the cooling rate≥20℃/s,the microstructure transforms into martensite.Through this experimental study,the austenite continuous cooling transformation rule of the steel under different cooling rates is obtained,and the CCT curve is drawn,which provides experimental data support for the optimization of the controlled cooling process after rolling,and supports downstream users to rationally formulate the subsequent hot working cooling process.
作者
李祥龙
陈远生
林晏民
李富强
LI Xiang-long;CHEN Yuan-sheng;LIN Yan-min;LI Fu-qiang(Guangdong ZNIS Co.,Ltd.of Baowu Group Zhongnan Iron&Steel,Shaoguan,Guangdong,512123,P.R.China)
出处
《南方金属》
CAS
2023年第6期1-5,12,共6页
Southern Metals
关键词
46MnVS5钢
热模拟
临界相变温度
连续冷却转变曲线
steel 46MnVS5
thermal simulation
critical phase transition temperature
continuous cooling transition curve
