摘要
采用Gleeble-3800热模拟实验机测定了一种低碳高铜高镍合金钢50%形变奥氏体在1~50℃/s冷速下的膨胀曲线,结合不同冷速下的相变组织及维氏硬度分析,确定相变温度,获得了实验钢的形变奥氏体连续冷却转变曲线(CCT曲线)。结果表明,高含量的Cu和Ni元素可以促进贝氏体组织的形成。在较低冷速条件下(1~10℃/s),组织基本为粒状贝氏体,并随着冷速增大而尺寸细化。在较高冷速条件下(20~40℃/s),组织主要为细小的粒状贝氏体和少量的板条贝氏体,随冷速增大,组织类型和硬度基本保持不变,表明在此较宽冷速区间实验钢容易得到稳定的组织和性能。当冷速超过50℃/s,开始出现马氏体组织。
The expansion curves of 50% deformed austenite of low-carbon, high-copper and high-nickel alloy steel at cooling rates of 1-50 ℃/s were measured by Gleeble-3800 thermal simulator. Combined with the phase transformation microstructure and Vickers hardness analysis, the phase transformation temperatures were determined and the continuous cooling transformation curves(CCT curves) of deformed austenite of the test steel were obtained. The results show that the high content of Cu and Ni elements can promote the transformation of bainite. At a relatively low cooling rate(1-10 ℃/s), the microstructure is basically granular bainite and the size is refined with the increase of cooling rate. Under the condition of high cooling rate(20-40 ℃/s), the microstructure is mainly fine granular bainite and a small amount of lath bainite. With the increase of cooling rate, the microstructure and hardness of the experimental steel remain unchange, which indicates that it is easy to obtain stable microstructure and properties in this wide cooling rate range. When the cooling rate exceeds 50 ℃/s,martensite structure begins to appear.
作者
李炯轶
李烈军
高吉祥
陈松军
温志林
彭政务
LI Jiongyi;LI Liejun;GAO Jixiang;CHEN Songjun;WEN Zhilin;PENG Zhengwu(National Engineering Research Center for Metal Materials Near Net Forming Technology,South China University of Technology,Guangzhou 510640,China;Guang Dong Provincial Key Laboratory of New Metal Materials Preparation and Forming,South China University of Technology,Guangzhou 510640,China;Guangdong Technical Normal University,Guangzhou 510450,China)
出处
《热加工工艺》
北大核心
2021年第16期117-121,共5页
Hot Working Technology
基金
国家自然科学基金项目(51801066)
广东省自然科学基金项目(2017A030313276,2018A030310405)
广州市对外合作项目(202007020007,201907010011)。
关键词
低碳贝氏体
高铜高镍
形变奥氏体
热膨胀法
CCT曲线
low carbon bainite
high copper and high nickel
deformed austenite
thermal expansion method
CCT curves
