Mod.9Cr-1Mo不锈钢循环软化特性分析  

Analysis of cyclic softening characteristics of Mod.9Cr-1Mo stainless steel

作　　者：金丹[1] 金铠 龙皓跃 韩高枫 JIN Dan;JIN Kai;LONG Haoyue;HAN Gaofeng(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142

出　　处：《实验力学》2022年第5期669-674,共6页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(项目号11102119);辽宁省教育厅项目(LJKZ0437)资助。

摘　　要：对Mod.9Cr-1Mo不锈钢550℃下循环软化特性的应变范围和路径相关性进行了分析,并采用ABAQUS软件对Mod.9Cr-1Mo不锈钢的循环软化特性进行了模拟。结果表明,Mod.9Cr-1Mo不锈钢在550℃不同路径、不同应变范围下均表现出了明显的循环软化现象,应变路径对循环软化特性的影响大于应变范围的影响。其次,采用非线性随动硬化与各向同性硬化的Chaboche混合模型进行了不同条件下循环软化特性模拟,单轴不同应变范围下的模拟结果与实验结果前100周次内最大平均误差仅为4.2%。针对主应变比为-0.54、-0.64和-0.80的3种多轴路径下的软化特性进行模拟计算,得到的正应力与实验结果一致性较好;剪应力的模拟结果与实验结果误差略大于正应力的结果,但100周次内平均误差最大值仍仅为3.2%。Based on the previous fatigue test results of Mo.9 Cr-1 Mo stainless steel at 550℃, the correlation analyses were carried out for cyclic softening characteristics related to strain ranges and paths. Meanwhile, the ABAQUS software was used to select a hybrid model of nonlinear follow-up hardening and isotropic hardening to simulate the cyclic softening characteristics of the material. The results show that the material exhibits obvious cyclic softening in different paths and strain ranges at 550℃. In general, the effect of strain path on cyclic softening characteristics is greater than that of strain range. The Chaboche mixed hardening model was used to simulate the degree of cyclic softening under different conditions. The simulations are in agreement with the experimental results under different strain ranges, and the maximum average error is 4.2% in the first 100 cycles. The softening characteristics under the principal strain ratios of-0.54,-0.64 and-0.80 were simulated which agree with the experimental results in terms of normal stress. The error between the simulated shear stress and the experimental stress is slightly larger than that of the normal stress, while the maximum average error is 3.2% in the first 100 cycles.

关 键 词：Mod.9Cr-1Mo不锈钢 循环软化 本构模型 有限元模拟 

分 类 号：TG144[一般工业技术—材料科学与工程] TG142.12[金属学及工艺—金属材料]