Temperature-Dependent Compressive Deformation Behavior of Commercially Pure Iron Processed by ECAP  

作　　者：Ying Yan Yue Qi Qing-Wei Jiang Xiao-Wu Li 

机构地区：[1]Institute of Materials Physics and Chemistry, College of Sciences, Northeastern University [2]College of Materials Science and Engineering, Kunming University of Science and Technology [3]Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education, Northeastern University

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第5期531-541,共11页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51231002, 51271054, 51201077 and 50671023);the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20110042110017);the Fundamental Research Funds for the Central Universities of China (Nos. N110105001 and N120505001)

摘　　要：To explore the temperature dependence of deformation behavior of BCC structural materials and the relevant effect of pre-annealing, commercially pure iron （CP Fe） produced by equal-channel angular pressing （ECAP） is selected as the experimental material. The influences of deformation temperature T and pre-annealing on deformation behavior, surface deformation characteristics and substructures of ECAP Fe were systematically studied. The results show that ECAP Fe undergoes a remarkable strain softening stage after a rapid strain hardening during uniaxial compression, and the softening degree and the yield strength avs first decrease and then increase with raising temperature. Pre-annealing at 400 ℃ effectively weakens the strain softening degree and increases trys. To understand the influence of deformation temperature on deformation behavior, as well as the relevant pre-annealing effect, deformation and damage characteristics and dislocation structures are studied in detail. In a word, the strain softening of ECAP Fe is associated not only with internal structural instability, but also with temperature, and pre-annealing at 400 ℃ improves high-temperature me- chanical properties of ECAP Fe.To explore the temperature dependence of deformation behavior of BCC structural materials and the relevant effect of pre-annealing, commercially pure iron （CP Fe） produced by equal-channel angular pressing （ECAP） is selected as the experimental material. The influences of deformation temperature T and pre-annealing on deformation behavior, surface deformation characteristics and substructures of ECAP Fe were systematically studied. The results show that ECAP Fe undergoes a remarkable strain softening stage after a rapid strain hardening during uniaxial compression, and the softening degree and the yield strength avs first decrease and then increase with raising temperature. Pre-annealing at 400 ℃ effectively weakens the strain softening degree and increases trys. To understand the influence of deformation temperature on deformation behavior, as well as the relevant pre-annealing effect, deformation and damage characteristics and dislocation structures are studied in detail. In a word, the strain softening of ECAP Fe is associated not only with internal structural instability, but also with temperature, and pre-annealing at 400 ℃ improves high-temperature me- chanical properties of ECAP Fe.

关 键 词：ECAP Fe Uniaxiai compression High-temperature mechanical behavior PRE-ANNEALING Deformation features Microstructure 

分 类 号：TG156.2[金属学及工艺—热处理] TG376[金属学及工艺—金属学]