Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2016-10-01

Journal: 特殊钢

Included Journals: PKU

Volume: 37

Issue: 5

Page Number: 51-54

ISSN: 1003-8620

Key Words: 车削非调质钢SG4201;奥氏体;晶粒长大;粗化温度;激活能

Abstract: 采用Gleeble 3500热模拟试验机试验研究了直接车削用非调质钢SG4201(/％:0.42C,0.50Si,1.40Mn,0.009P,0.005S,0.02Nb,0.06V,0.015N)在1 000 ～1 250℃加热0～300 s的奥氏体晶粒长大行为,并建立了该钢奥氏体晶粒长大模型.试验结果表明,加热时间30 s时,奥氏体晶粒粗化温度和铌迅速大量固溶的温度为1 100℃左右;奥氏体晶粒长大激活能约为110.8 kJ;确立SG4201钢铸坯均热不宜超过1 150℃.工业生产结果表明,当铸坯均热温度≤1 150℃,终轧温度800～850℃,轧后冷却速度30 ～35℃/s时,SG4201钢的力学性能为抗拉强度927 MPa,屈服强度687 MPa,延伸率23.5％,断面收缩率57％,U-冲击功48 J,HBW硬度值265.