CLAM钢CCT曲线的测定与分析  

Determination and analysis of CCT curves of CLAM steel

作　　者：丁文圆 赵飞[1,2] 张欢[1,2] 叶帅[1,2] 李春京[3] DING Wen-yuan ZHAO Fei ZHANG Huan YE Shuai LI Chun-jing(College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China National Local Joint Engineering Laboratory of High Performance Metal Structure Material and Manufacture Technology, Guizhou University, Guiyang 550025, China Key Laboratory of Neutronies and Radiation Safety, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]高性能金属结构材料与制造技术国家地方联合工程实验室,贵州贵阳550025 [3]中国科学院核能安全技术研究所物理与辐射安全重点实验室,安徽合肥230031

出　　处：《材料热处理学报》2017年第7期101-106,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51461008;51571066)

摘　　要：利用高分辨率Bhr DIL-805 A/D相变仪结合金相-硬度法研究了CLAM钢过冷奥氏体连续冷却转变曲线(CCT曲线)。根据实验数据测得了A_(c1),A_(c3),M_s和M_f点,以及得到了不同冷却速率连续冷却膨胀曲线。结果表明:当冷却速率小于2℃/min时,发生了铁素体转变,主要得到块状铁素体组织,渗碳体在铁素体边界富集,并且数量随着冷却速率的升高而增加;当冷却速率在3~5℃/min时,发生铁素体和马氏体转变,得到铁素体和马氏体组织;当冷却速率大于10℃/min时,只发生马氏体转变,得到完全马氏体组织。Continuous cooling transformation（CCT） curves of the under-cooled austenite of China low activation martensitic （ CLAM ） steel were obtained by using high-resolution Btihr DILS05 A/D phase transformation test, optical microscope and Vickers hardness test. The critical points of the steel, which including Ac1, Ac3, M and Mf, were determined by the experimental data, and the continuous cooling expansion curves with different cooling rates were obtained. The results show that the ferrite transformation occurs when the cooling rate is lower than 2 ~C/min, and the bulk ferrite structure is obtained. The cementite is enriched at the ferrite boundary and the amount of the cementite increases with the increasing of the cooling rates. The ferrite and martensite transformation occurs when the cooling rate is between 3 to 5 ℃/min, and the ferrite and martensite microstructure are obtained. Only martensite is obtained when the cooling rate is higher than 10 ℃/min.

关 键 词：CLAM钢 CCT曲线 临界点 膨胀曲线 

分 类 号：TG142.2[一般工业技术—材料科学与工程]