23MnNiMoCr54钢的热变形行为  

Hot deformation behavior of 23MnNiMoCr54 steel

作　　者：李硕[1] 方光锦 汪青芳 陈世昌 卢春光 Li Shuo;Fang Guangjin;Wang Qingfang;Chen Shichang;Lu Chunguang(Xining Special Steel Co.,Ltd.,Xining Qinghai 810005,China)

机构地区：[1]西宁特殊钢股份有限公司,青海西宁810005

出　　处：《金属热处理》2021年第5期127-132,共6页Heat Treatment of Metals

摘　　要：利用DIL 805A型热膨胀仪测定了23MnNiMoCr54钢的热膨胀曲线,结合硬度检验绘制出试验钢的CCT曲线,并对其动态相变及动态再结晶规律进行了研究分析。结果表明,23MnNiMoCr54钢的临界转变点Ac_(3)=806℃,Ac_(1)=713℃,CCT曲线中无珠光体转变区,当冷速≥0.5℃/s时,开始发生马氏体相变。变形量为10%时,变形温度在850~1150℃范围内时,试验钢的奥氏体晶粒边界稳定,晶粒大小没有发生明显变化,没有发生动态再结晶,软化机制以动态回复为主。变形量为40%时,变形温度在850℃时试验钢没有发生动态再结晶,软化机制以回复为主;温度为900~950℃时出现了不稳定的奥氏体晶界和细小晶粒,动态再结晶开始发生;温度为1000℃时,发生了完全动态再结晶。变形量为50%时,变形温度在850~950℃时试验钢出现了不稳定的奥氏体晶界和细小晶粒,发生了部分再结晶;温度为1000℃时,发生了完全动态再结晶。变形量为60%时,变形温度在850~950℃时试验钢出现了不稳定的奥氏体晶界和细小晶粒,发生了部分再结晶;温度为1000℃时,发生了完全动态再结晶。Thermo dilatometric curve of 23MnNiMoCr54 steel was measured by a DIL 805 A thermal dilatometer,CCT curve of the tested steel was drawn in combination with the hardness test,and the dynamic phase transformation and dynamic recrystallization laws were studied and analyzed.The results show that the critical transformation temperatures of the 23MnNiMoCr54 steel are:Ac_(3)=806℃,Ac_(1)=713℃,and there is no pearlite transformation zone in the CCT curve.When the cooling rate is greater than or equal to 0.5℃/s,the martensitic transformation begins.When the deformation amount is 10% and deformed at 850-1150℃,the austenite grain boundary of the tested steel is stable,the grain size does not change significantly,no dynamic recrystallization occurs,and the softening mechanism is mainly dynamic recovery.When the deformation amount is 40%,no dynamic recrystallization of the tested steel occurs at 850℃,and the softening mechanism is mainly recovery.Unstable austenite grain boundaries and fine grains appear when the deformation temperature is at 900-950℃,and dynamic recrystallization begins to occur.At 1000℃,complete dynamic recrystallization occurs.When the deformation amount is 50%,unstable austenite grain boundaries and fine grains appear when deformed at 850-950℃,and partial recrystallization occurs.At deformation temperature of 1000℃,complete dynamic recrystallization occurs.When the deformation amount is 60%,unstable austenite grain boundaries and fine grains of the tested steel appear when deformed at 850-950℃,and partial recrystallization occurs.At deformation temperature of 1000℃,complete dynamic recrystallization occurs.

关 键 词：23MnNiMoCr54钢 膨胀仪法 CCT曲线 再结晶 晶粒度 

分 类 号：TG115.21[金属学及工艺—物理冶金]