含氮H13热作模具钢的热变形行为及热加工图  

Hot deformation behavior and hot processing map of N-containing H13 hot working die steel

作　　者：原凌云[1] YUAN Ling-yun(Technology Center,Shanxi Taigang Stainless Steel Co Ltd,Taiyuan 030003,China)

机构地区：[1]山西太钢不锈钢股份有限公司技术中心,山西太原030003

出　　处：《材料热处理学报》2024年第1期185-192,共8页Transactions of Materials and Heat Treatment

摘　　要：利用Gleeble-3800热模拟试验机,对含氮的H13热作模具钢开展了不同温度以及单道次的单向压缩试验,研究了其在应变速率为0.01~10 s^(-1)、变形温度为900~1250℃条件下的热变形行为,并根据高温应力-应变曲线,运用双曲正弦函数理论建立了该钢的本构模型,并根据动态材料模型确定了其在不同应变下的热加工图。结果表明:高温热压缩变形状态下,含氮H13热作模具钢的流变应力随变形温度的升高而降低,随应变速率的降低而减小,当变形温度高于1100℃,应变速率小于0.1 s^(-1)时,含氮H13热作模具钢的流变应力曲线表现为动态再结晶特征;含氮H13热作模具钢的热变形激活能为610.23 kJ/mol,适合的热加工工艺范围为1100~1250℃,应变速率0.8~10 s^(-1)。A Gleeble-3800 thermal simulation testing machine was used to conduct unidirectional single-pass compression tests at different temperatures for N-containing H13 hot working die steel.The hot deformation behavior of the steel was studied under conditions of strain rate of 0.01-10 s^(-1) and deformation temperature of 900-1250℃.Based on the high-temperature stress-strain curves,a constitutive model of the steel was established using hyperbolic sine function theory,and the hot processing map under different strains was established based on the dynamic material model.The results show that under high temperature hot compression deformation,the flow stress of the Ncontaining H13 hot working die steel decreases with the increase of deformation temperature and the decrease of strain rate.When the deformation temperature is above 1100℃and the strain rate is less than 0.1 s^(-1),the flow stress curves of the N-containing H13 hot working die steel exhibit dynamic recrystallization characteristics.The hot deformation activation energy of the N-containing H13 hot working die steel is 610.23 kJ/mol,and the suitable hot working process region is deformation temperature of 1100-1250℃and strain rate of 0.8-10 s^(-1).

关 键 词：含氮H13钢 热压缩变形 本构方程 热加工图 

分 类 号：TG142.4[一般工业技术—材料科学与工程]