2Cr12NiMo1W1V超临界钢高温流变应力模型及热加工图  

High temperature flow stress model and hot processing map for 2Cr12NiMo1W1V supercritical steel

作　　者：王梦寒[1] 陈明亮[1] 王瑞[1] 王根田 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030

出　　处：《中南大学学报（自然科学版）》2016年第3期741-748,共8页Journal of Central South University:Science and Technology

基　　金：科技部重大专项(2012ZX04010-081)~~

摘　　要：为研究2Cr12Ni Mo1W1V超临界马氏体不锈钢的高温变形行为,对其进行热压缩试验,得到其在变形温度为1 123~1 373 K,应变速率为0.005~5 s-1的真应力-真应变曲线,对流变应力特征进行研究,分析其高温变形的物理本质。采用Zener-Hollomon参数法构建动态材料模型（DMM）,以热压缩试验为基础,建立不同应变下的热加工图。根据变形稳定阶段的热加工图确定该马氏体不锈钢热变形的失稳区和安全区。研究结果表明：采用该合金的高温塑性变形本构模型所得预测值与实验值拟合程度高,表明该合金在热变形过程中的流变应力可用构建的双曲正弦本构模型来描述;热加工图受变形量影响较大,当变形较小时,安全区随着应变增加而发生迁移,变形进入稳定阶段后,安全区保持恒定;在低温高应变区（温度为1 200~1 280 K,应变速率为1~5 s-1）以及高温低应变区（温度为1 320~1 400 K,应变速率为0.1~0.3 s-1）这2个区域为变形安全区,适合2Cr12Ni Mo1W1V超临界马氏体不锈钢进行热加工。In order to study the high temperature deformation behavior of 2Cr12 Ni Mo1W1V supercritical martensitic stainless steel, the true stress-strain curves from thermal compression test was studied to get the intrinsic properties at the temperature of 1 123-1 373 K, and the strain rate of 0.005-5 s-1. The constitutive model of the steel at elevated temperature was obtained by introducing Zener-Hollomon parameter, and the good agreement between the predicted and experimented values confirm that flow stress in the thermal deformation can be described by the hyperbolic sine constitutive equation. The processing maps in the case of different true strains based on dynamic material model and the experiment were analyzed. The results show that the hot processing maps are greatly influenced by strain, and the safety zone migrates with the increase of strain when the deformation is small, and keeps constant when the deformation is steady. The instability and safety zones of thermal deformation can also be recognized by the maps in stable stage, and the region of low temperature and high strain rate（temperature of 1 200-1 280 K, strain rate of 1-5 s-1）, and region of high temperature and low strain rate（temperature of 1 320-1 400 K, strain rate of 0.1-0.5 s-1） are the safty zones, which are suitable for deformation of 2Cr12 Ni Mo1W1V supercritical martensitic stainless steel.

关 键 词：超临界马氏体不锈钢 本构模型 热加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]