Effect of thermal annealing on the microstructure, mechanical properties and residual stress relaxation of pure titanium after deep rolling treatment

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英文篇名：Effect of thermal annealing on the microstructure, mechanical properties and residual stress relaxation of pure titanium after deep rolling treatment 作者：Jie ; Huang ; Kai-Ming ; Zhang ; Yun-Fei ; Jia ; Cheng-Cheng ; Zhang ; Xian-Cheng ; Zhang ; Xian-Feng ; Ma ; Shan-Tung ; Tu 英文作者：Jie Huang;Kai-Ming Zhang;Yun-Fei Jia;Cheng-Cheng Zhang;Xian-Cheng Zhang;Xian-Feng Ma;Shan-Tung Tu;Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology;AECC Commercial Aircraft Engine Co. Ltd., Shanghai Engineering Research Center for Commercial Aircraft Engine;Sino-French Institute of Nuclear Engineering and Technology, SunYat-Sen University; 英文关键词：Deep rolling;;Ultra-fine grain;;Tensile strength;;Microstructure;;Residual stress 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology;AECC Commercial Aircraft Engine Co. Ltd., Shanghai Engineering Research Center for Commercial Aircraft Engine;Sino-French Institute of Nuclear Engineering and Technology, SunYat-Sen University; 出版日期：2019-03-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 基金：supported by the National Natural Science Foundation of China (Nos. 51725503 and 51575183);; the “111 Project”;; the support by the Shanghai Pujiang Program;; Young Scholar of the Yangtze River Scholars Program;; Shanghai Technology Innovation Program of SHEITC (No. CXY-2015-001) 语种：英文; 页：CLKJ201903025 页数：9 CN：03 ISSN：21-1315/TG 分类号：183-191

摘要

The aim of this paper was to investigate the effect of thermal annealing on the microstructure, mechanical properties, and residual stress relaxation of deep rolled pure titanium. The microstructure and mechanical properties of the surface modified layer were analyzed by metallographic microscopy, transmission electron microscope and in-situ tensile testing. The results showed that the annealed near-surface layer with fine recrystallized grains had increased ductility but decreased strength after annealing below the recrystallization temperature, where the tensile strength was still higher than that of the substrate. After annealing at the recrystallization temperature, the recrystallized near-surface layer had smaller grain size,similar tensile strength, and higher proportional limit, comparable to those of the substrate. Moreover, the residual stress relaxation showed evidently different mechanisms at three different temperature regions:low temperature(T≤ 0.2 Tm), medium temperature(T≈(0.2–0.3) Tm), and high temperature(T≥ 0.3 Tm).Furthermore, a prediction model was proposed in terms of modification of Zener-Wert-Avrami model,which showed promise in characterizing the residual stress relaxation in commercial pure Ti during deep rolling at elevated temperature.
        The aim of this paper was to investigate the effect of thermal annealing on the microstructure, mechanical properties, and residual stress relaxation of deep rolled pure titanium. The microstructure and mechanical properties of the surface modified layer were analyzed by metallographic microscopy, transmission electron microscope and in-situ tensile testing. The results showed that the annealed near-surface layer with fine recrystallized grains had increased ductility but decreased strength after annealing below the recrystallization temperature, where the tensile strength was still higher than that of the substrate. After annealing at the recrystallization temperature, the recrystallized near-surface layer had smaller grain size,similar tensile strength, and higher proportional limit, comparable to those of the substrate. Moreover, the residual stress relaxation showed evidently different mechanisms at three different temperature regions:low temperature(T≤ 0.2 Tm), medium temperature(T≈(0.2–0.3) Tm), and high temperature(T≥ 0.3 Tm).Furthermore, a prediction model was proposed in terms of modification of Zener-Wert-Avrami model,which showed promise in characterizing the residual stress relaxation in commercial pure Ti during deep rolling at elevated temperature.

引文

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