40Cr钢热变形行为及热加工图  

Hot deformation behavior and hot processing map of 40Cr steel

作　　者：郭卜瑞 徐佳炜 刘世媛 单德彬[1] 徐文臣[1] GUO Bu-rui;XU Jia-wei;LIU Shi-yuan;SHAN De-bin;XU Wen-chen(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001

出　　处：《塑性工程学报》2023年第2期97-104,共8页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2018YFB1309100)。

摘　　要：为研究40Cr钢的热变形行为和热加工性能,在Gleeble1500型热模拟试验机上对40Cr钢进行了不同参数下的等温热压缩试验,建立了包含再结晶特征的40Cr钢高温流变应力模型,并绘制了其热加工图。结果表明,所建立的流动应力模型能够很好地预测40Cr钢不同热变形条件下的应力-应变曲线。观察了不同变形条件下热压缩试样的微观组织,发现失稳区域为不完全动态再结晶的“项链”组织,非失稳区域中耗散值较小区域和较大区域分别为平均晶粒尺寸为128.2和20.4μm的动态再结晶组织,验证了热加工图的可靠性。结合微观组织观察和热加工图分析,可以确定40Cr钢的最佳热加工区域为温度1050~1150℃、应变速率1~10 s^(-1)。To study the hot deformation behavior and hot workability of 40Cr steel,the isothermal hot compression tests with different parameters were carried out on Gleeble1500 thermal simulator,high temperature rheological stress model including recrystallization characteristics of 40Cr steel was established,and the hot processing map was drawn.The results show that the established model can well predict the stress-strain curve of 40Cr steel under different hot deformation conditions.The microstructure of hot compression specimen was observed.It is found that the instability region presents a“necklace”microstructure with incomplete dynamic recrystallization,and the non-stability regions with a smaller dissipation value and larger dissipation value are dynamic recrystallization microstructure with average grain sizes of 128.2 and 20.4μm,respectively,which verifies the reliability of the hot processing map.Combined with the microstructure observation and the hot processing map analysis,it is determined that the optimal hot processing zone of 40Cr steel is the temperatures of 1050-1150℃and strain rates of 1-10 s^(-1).

关 键 词：40CR钢 动态再结晶 高温流变应力模型 热加工图 微观组织 

分 类 号：TG142.14[一般工业技术—材料科学与工程]