摘要
为支撑S55C-S优碳钢控轧控冷工艺的制定,及合理制定热处理工艺,利用Gleeble3800热模拟机相变膨胀法,结合金相组织分析及硬度试验分析,研究S55C-S优碳钢组织相变规律。试验测定了S55C-S钢Ac1、 Ac3、 Ar1、 Ar3等临界相变点温度,并测定了该钢种静态连续转变CCT曲线。结果表明,当冷速≤3℃/s时,主要为铁素体+珠光体转变;冷速≥4℃/s时,开始有极少贝氏体,少量马氏体转变;冷速≥20℃/s时,主要转变为极少贝氏体和马氏体、极少珠光体;冷速≥30℃/s时,组织转变为马氏体。通过本试验研究,得到了不同冷速下S55C-S钢组织相变规律,绘制了静态CCT曲线,为控冷工艺制定提供实验数据支撑,同时供下游用户参考,用户使用该成果制定合理的热处理工艺,可获得需要的材料性能。
In order to support the formulation of controlled rolling and cooling process of S55 C-S superior carbon steel and reasonable formulation of heat treatment process, the phase transformation expansion method of Gleeble3800 thermal simulator, combined with metallographic structure analysis and hardness test analysis, was used to study the law of phase transition of S55C-S superior carbon steel. In the test, critical phase transition temperatures such as Ac1,Ac3, Ar1, Ar3 of S55 C-S steel and the static continuous transition CCT curve of the steel were measured. The results show that when the cooling rate is ≤3 ℃/s, the structure transformation is mainly ferrite+pearlite;when the cooling rate is ≥4 ℃/s, there is very little bainite and a small amount of martensite transformation;when the cooling rate is ≥20 ℃/s, it mainly transforms into little bainite, martensite and very little pearlite;when the cooling rate is ≥30 ℃/s, the microstructure transformed into martensite. Through this experimental study, the phase transformation law of S55 C-S steel structure at different cooling rates was obtained, and the static CCT curve was drawn to provide experimental data support for the development of the controlled cooling process, and at the same time, it is for the reference of downstream users. The user uses this result to formulate a reasonable heat treatment process, and they can obtain required material properties.
作者
李祥龙
陈远生
刘金源
董凤奎
LI Xianglong;CHEN Yuansheng;LIU Jinyuan;DONG Fengkui(Baowu Group Guangdong Shaoguan Iron and Steel Co.,Ltd.,Shaoguan 512123,China;Baosteel Special Steel Shaoguan Co.,Ltd.,Shaoguan 512123,China)
出处
《金属材料与冶金工程》
CAS
2020年第6期3-9,共7页
Metal Materials and Metallurgy Engineering
关键词
S55C-S钢
热模拟
临界相变温度
连续冷却转变曲线
S55C-S steel
thermal simulation
critical phase transition temperature
continuous cooling transition curve
