热变形制度对20CrMoH合金钢再结晶的影响  

EFFECT OF HOT DEFORMATION REGIME ON RECRYSTALLIZATION OF 20CrMoH ALLOY STEEL

作　　者：段路昭 李杰 年保国 罗扬 张大伟 冯立果 Duan Luzhao;Li Jie;Nian Baoguo;Luo Yang;Zhang Dawei;Feng Liguo(HBIS Materials Technology Research Institute,Shijiazhuang 050000,Hebei)

机构地区：[1]河钢材料技术研究院,河北石家庄050000

出　　处：《河北冶金》2024年第8期6-10,共5页Hebei Metallurgy

摘　　要：利用Gleeble-3500热模拟试验机研究了20CrMoH合金钢以1 s^(-1)的变形速率,在900~1050℃等不同变形温度条件下,压下量分别为20%(变形后立即快冷)、20%+20%(变形后立即快冷和变形后在变形温度保温60 s后立即快冷)和65%(变形后立即快冷)时的回复再结晶行为。研究发现,相同变形量条件下,随着形变温度的提高,20CrMoH合金钢再结晶晶粒形核数量增加,晶粒出现不同程度的长大,再结晶程度加剧;相同变形温度条件下,随着变形量加大,再结晶程度明显增加。当变形量为20%时,材料在1000℃时,也并未完成动态再结晶;而当变形量增加到65%时,950℃即可完成动态再结晶,获得均匀细小晶粒。两道次(20%+20%)变形时,变形后保温时间对材料再结晶有明显影响。900℃以上变形时,材料在变形60 s内能够完成再结晶,形成均匀晶粒。变形后立即快冷时,温度升高到1000℃以上才能完成再结晶行为。The thermal deformation behavior of 20CrMoH alloy steel at the deformation rate of 1 s^(-1) at the deformation temperature of 900~1050℃with the reduction of 20%(quick cool immediately after deformation),20%+20%(quick cool immediately after deformation、keep 60 s at the deformation temperature then cooled immediately)and 65%(quick cool immediately after deformation)was studied by Gleeble-3500 thermal simulation tester.It was found that with the increase of deformation,the recovery recrystallization increases obviously.And the grains grow up in different degrees.With the increase of deformation,the degree of recrystallization increases obviously.The material did not complete dynamic recrystallization even at 1000℃when the deformation was 20%.When the deformation amount increases to 65%,the dynamic recrystallization can be completed at 950℃,and uniform fine grains can be obtained.The holding time after deformation has a significant effect on the recrystallization when the deformation was two passes(20%+20%).The material can complete recrystallization at 900℃and form uniform grains within 60 s.When the material was quickly cool immediately after deformation,the temperature of completed recrystallization can rise to more than 1000℃.

关 键 词：20CrMoH 热变形 再结晶 合金钢 快冷 

分 类 号：TG142.1[一般工业技术—材料科学与工程]