热旋压对20Mn2圆钢坯的组织和力学性能的影响  

Effect of Hot Spinning on Microstructure and Mechanical Properties of 20Mn2 Circular Steel Tube

作　　者：刘玉高[1] 吕宝君[1] 唐宁 邹剑[1] 

机构地区：[1]青岛农业大学机电工程学院,山东青岛266109 [2]烟台万斯特有限公司,山东烟台265200

出　　处：《热加工工艺》2011年第15期109-110,共2页Hot Working Technology

摘　　要：以20Mn2钢制车桥为研究对象,分析测试了热旋压对于轴承台、油封台和缩脖处等三处的金相组织及其力学性能变化情况。研究结果表明:20Mn2钢制车桥原始显微组织较为细小,且加工硬化特征明显,硬度较高;现场堆冷导致热旋压变形后冷却速度较慢,加工硬化彻底消除,铁素体长大较为明显,轴承台、油封台等部位处魏氏组织特征较明显,缩脖处铁素体呈现块状分布特征。The effect of hot spinning on microstructure and mechanical properties of bearing stand,grease seal stand and neck-like location in 20Mn2 steel axle was tested and researched.The results show that the primitive microstructure of 20Mn2 steel axle is relatively small,work hardening effect is apparent,therefore hardness is large;cooling in pile after hot spinning lowers the cooling rate,work hardening thoroughly eliminates,ferrite grows up obviously,widmannstatten structure is apparent in bearing stand,grease seal stand,whereas ferrite presents lumpish in neck-like location.

关 键 词：车桥 加工硬化 金相组织 

分 类 号：TG376.2[金属学及工艺—金属压力加工]