终轧工艺及轧后冷速对GCr15SiMn钢相变组织的影响  

Effect of finish rolling process and cooling rate after rolling on transformation microstructure of GCr15SiMn steel

作　　者：霍向东[1] 刘江[1] 李烈军[2] 孙海波[2] 高吉祥[2] 夏继年 HUO Xiang-Dong LIU Jiang LI Lie-Jun SUN Hai-Bo GAO Ji-Xiang XIA Ji-Nian(School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China Near Net Shape Forming of Metal Materials Engineering Technology Research Center, South China University of Technology, Guangzhou 510641, China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]华南理工大学国家金属材料近净成形工程技术研究中心,广东广州510641

出　　处：《材料热处理学报》2017年第2期118-124,共7页Transactions of Materials and Heat Treatment

摘　　要：采用Gleeble3800热/力模拟试验机研究了终轧工艺和轧后冷速对GCr15Si Mn轴承钢相变组织转变的影响,结合动态CCT曲线及不同工艺下的组织与显微硬度分析。结果表明:变形速率对试验钢的组织转变没有太大影响;随着变形量的增加,二次碳化物析出增多,珠光体转变温度升高,珠光体转变量增加且球团直径减小;当冷速由1℃/s升高为5℃/s时,晶界处二次碳化物析出明显减少,网碳基本消失,组织将会出现马氏体,马氏体转变温度为163℃,终轧后控制冷却速度可以达到控制组织转变类型的目的。The influence of finish roiling process and cooling rate after rolling on phase transformation microstructure of GCr15SiMn bearing steel was studied by a Gleeble 3800 thermal/mechanical simulator, combined with the analysis of the dynamic CCT curve, the metallographic mierostructure and microhardness. The results show that deformation rate has little effect on the microstructure transformation of the test steel. With the increasing of deformation degree, the precipitation amount of secondary carbide increases, the transition temperature and the transformation amount of pearlite increase, and the pellet diameter of the pearlite decreases. When the cooling rate increasing from 1 ℃/s to 5 ℃/s, the precipitation amount of the secondary carbide at grain boundary reduces significantly, network carbide disappears, and the martensite appears. Controlling cooling rate after finishing rolling can achieve the purpose of changing microstructure transformation type.

关 键 词：变形速率 变形量 组织转变 网状碳化物 控制冷却 

分 类 号：TG142.4[一般工业技术—材料科学与工程]