一种曲轴用中碳非调质钢的热变形行为  

Study on Hot Deformation Behavior of Medium-Carbon Non-quenched and Tempered Steel for Crankshafts

作　　者：王振华[1] 厉勇[2] 曲明贵[1] 任利国[1] 傅万堂[1] 

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《钢铁》2009年第12期79-82,共4页Iron and Steel

摘　　要：用Gleeble-3500热力模拟试验机对一种中碳曲轴用非调质钢进行1 223～1 473 K和0.2～10 s-1的热压缩变形,获得了其流变曲线,并给出了试验用钢的热变形方程式、动态组织状态图、动态再结晶晶粒尺寸与Z参数之间以及动态再结晶分数与应变量之间的定量关系式。结果表明,试验用钢的流变应力和峰值应变均随变形温度的降低和应变速率的提高而增大,动态再结晶晶粒平均尺寸随着变形Z参数的增大而减小,Z参数越大,发生动态再结晶和完全动态再结晶所需的应变也越大。Hot-compression test of a medium-carbon non-quenched and tempered steel for crankshafts were conducted on a Gleeble-3500 thermal-mechanical simulator.Combining the flow stress with microstructure observation,the hot deformation equation,dynamic microstructure diagram,the quantitative relationship between dynamic recrystallization（DRX） grain size and Z value as well as the relationship between DRX fraction and strain were obtained.The results show that the flow stress and the peak strain increase with the drop in the deformation temperature and the rise in the strain rate; DRX grain size increases with decreasing Z value, the higher the Z value, the bigger the critical strains for initiation of DRX and full DRX.

关 键 词：中碳非调质钢 热变形 动态再结晶 显微组织 曲轴 

分 类 号：TG142.15[一般工业技术—材料科学与工程]