20CrMnTiH齿轮钢连铸坯表层纵裂的热模拟研究  

A Study on Heat Simulation of Surface Longitudinal Crack of Gear Steel 20CrMnTiH Concasting Billet

作　　者：刘石虹[1] 武守防[1] 李宏[1] 王恭亮[2] 梁玫[2] 王新华[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]石家庄钢铁有限责任公司,石家庄050031

出　　处：《特殊钢》2007年第6期1-3,共3页Special Steel

摘　　要：通过Gleeble-1500热模拟机研究了20CrMnTiH齿轮钢(mm):150×150、180×220、220×300连铸坯600～1300℃的强度和塑性。试验结果表明,3种铸坯在650～950℃真实断裂强度S_k很低,在950～1200℃随温度升高S_k增加,超过1200℃时S_k降低;该钢的第2脆性区为950～700℃,增加连铸坯出结晶器坯壳厚度,降低950～700℃区间停留时间,有利于防止裂纹源扩展成纵裂纹。The strength and plasticity of （mm） 150 × 150, 180 × 220 and 220 × 300 concasting billet of gear steel 20CrMnTiH at 600 - 1 300 ℃ have been studied by Gleeble-1500 thermal simulation machine. Test results showed that the actual strength at fracture Sk of three size of billet at 650-950 ℃ was very low, at 950 ~ 1 200 ℃ the Sk increased with increasing temperature, then the Sk decreased at temperature higher than 1 200 ℃ ; the second brittle zone of steel was at 950 - 700 ℃. It is available to prevent crack source evolving into longitudinal crack by increasing the shell thickness of billet out of mold and decreasing holding time at 950 - 700 ℃zone.

关 键 词：20CRMNTIH齿轮钢 铸坯 纵裂纹 力学性能 热模拟 

分 类 号：TF777[冶金工程—钢铁冶金]