摘要
利用Gleeble高温拉伸模拟实验与微观组织结构分析,研究了850~1200℃时稀土Ce对环保型铋易切削钢热塑性的影响。结果表明:稀土Ce可显著提高铋易切削钢1000℃时的热塑性,使高温变形塑性温度区间扩大50℃。稀土Ce对铋易切削钢热塑性的改善,主要与稀土Ce降低钢的动态再结晶开始温度有关。850~950℃时,铋易切削钢差的热塑性主要与晶界液态铋膜偏聚、形变奥氏体未发生动态再结晶、及沿晶先共析铁素体薄膜的析出有关。
The hot plasticity of eco-friendly bismuth free cutting steels with and without Ce was studied using a Gleeble-1500 thermal-mechanical simulator and microstructure analysis at 850—1200℃.The results showed that the hot plasticity of bismuth free-cutting steel was substantially improved by the addition of rare earth Ce at 1000℃,and the plastic deformation temperature range was expanded 50℃,which was mainly associated to the lowering of dynamic recrystallization(DRX)onset temperature by Ce.At 850—950℃,the steels with and without Ce both had a poor hot plasticity,which was mainly attributed to the segregation of liquid bismuth films and the absence of dynamic recrystallization as well as the presence of pro-eutectoid ferrite film at austenite grain boundaries.
作者
王键
刘海涛
杨争媛
尹宝舒
张家得
张高祥
WANG Jian;LIU Haitao;YANG Zhengyuan;YIN Baoshu;ZHANG Jiade;ZHANG Gaoxiang(School of Materials Science and Engineering,Luoyang 471023,Henan,China;Henan University of Science and Technology,Henan Key Laboratory of Non-ferrous Materials Science&Processing Technology,Luoyang 471023,Henan,China;Collaborative Innovation Center of Non-ferrous Metals Henan Province,Luoyang 471023,Henan,China)
出处
《四川冶金》
CAS
2019年第4期13-17,共5页
Sichuan Metallurgy
基金
国家级大学生创新创业训练计划项目（S201810464002）
河南科技大学大学生研究训练计划（SRTP）项目（2018028）
河南科技大学博士科研启动基金资助（13480086）
关键词
易切削钢
热塑性
铋偏聚
奥氏体晶界
动态再结晶
free-cutting steel
hot plasticity
bismuth segregation
austenite boundary
dynamic recrystallization
