摘要
利用Gleeble-3500热模拟试验机,在900℃~1 200℃变形温度、0.1s^(^(-1))~10s^(^(-1))应变速率下,针对工业用42CrMo钢锻坯进行变形量为60%的热压缩试验,并对其高温塑性变形行为和金相组织进行研究。基于试验数据,建立了包含变形温度、应变速率及应变的锻态42CrMo钢的高温变形本构方程及微观组织模型。基于动态材料模型建立了其真应变为0.9时的热加工图,在900℃~1000℃、0.1s^(-1)~0.2s^(-1)和1050℃~1125℃、3s^(-1)~10s^(-1)范围下为完全动态再结晶,且晶粒细小。对转向节臂的锤锻成形工艺进行研究,验证了所建立应力及微观组织模型的正确性。
Hot compression deformation tests with height reduction of 60% were conducted on forging stock of 42 CrMo steel by using a Gleeble-3500 thermal simulator with deformation temperatures ranging from 900℃ to 1 200℃ and strain rates ranging from 0.1s-1 to 10s-1.Both deformation behaviors of 42 CrMo steel and metallographic structures were investigated under different deformation conditions.The constitutive equation and the microstructure model of the forged 42 CrMo steel were established considering deformation temperature,strain rate and strain based on the experimental data.The hot processing map was also established according to dynamic materials model at the true strain of 0.9.In the hot processing map,the dynamic recrystallization occurs in the temperature range of 900℃-1000℃,strain rate range of 0.1s-1-0.2s-1 and the temperature range of 1 050℃-1 125℃and strain rate range of 3s-1-10s-1,and the grain size is small.The hammer forging technology of the steering knuckle arm was studied,which evaluated the validity of the stress and microstructure model.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2016年第5期173-178,共6页
Journal of Plasticity Engineering
关键词
锻态42CrMo钢
热压缩变形
应力及微观组织模型
热加工图
转向节臂
as-forged 42CrMo steel
hot compression deformation
stress and microstructure model
hot processing map
steering knuckle arm
作者简介
骆俊廷，男，1975年生，教授，主要从事精密塑性加工工艺与装备、微纳米塑性加工研究.E-mail：luojunting@ysu．edu．cn
