优质碳素结构55Mn钢连续冷却转变特性  

Characteristic of Quality Carbon Structural 55Mn Steel During Continuous Cooling Transformation

作　　者：陈连生[1] 齐祥羽 田亚强[1] 宋进英[1] 

机构地区：[1]河北联合大学河北省现代冶金技术重点实验室,河北唐山063009

出　　处：《热加工工艺》2015年第16期119-121,126,共4页Hot Working Technology

摘　　要：采用膨胀法结合金相-硬度法,在Gleeble-3500热模拟机上测定了55Mn钢的连续冷却转变CCT曲线;研究了连续冷却过程中冷却速度对55Mn钢室温组织的影响。结果表明,当冷速为0.05~15℃/s时,转变产物主要为铁素体（F）和珠光体（P/S/T）;当冷速达到15℃/s时,开始析出白色块状马氏体;当冷速为15~40℃/s时,只发生珠光体转变和马氏体转变,且随着冷速的增大,马氏体含量逐渐增多;当冷速大于40℃/s时,只发生马氏体转变,室温组织为马氏体＋残余奥氏体。The continuous cooling transformation （CCT） curve of 55Mn steel was measured by using Gleeble-3500 thermal mechanical simulator by expansion method and metallography hardness. The effects of continuous cooling rate on the microstructure of 55Mn steel were analyzed. The results show that the austenite transformation products are ferrite and pearlite, when the cooling rate is in the range of 0.05-15 ℃/s. White block martensite begins to precipitate when the cooling rate reaches 15℃/s. Those are only pearlite and martensite transformation, and with the cooling rate increasing, the martensite content increases when the cooling rate is 15-40℃/s. Those will be only martensite transformation and the microstructure is martensite and retained austenite if the cooling rate is higher than 40℃/s.

关 键 词：55Mn钢 热模拟 膨胀法 金相-硬度法 连续冷却转变曲线 

分 类 号：TG142.45[一般工业技术—材料科学与工程] TF763[金属学及工艺—金属材料]