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Iranian Journal of Materials Forming، جلد ۹، شماره ۳، صفحات ۴-۱۷
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عنوان انگلیسی The Effects of the Thermo-Mechanical Process Variables on the Microstructure, Mechanical Properties, and Recrystallization Behavior of the Commercially Pure Titanium
چکیده انگلیسی مقاله Commercial pure titanium sheets were thermo-mechanically treated to investigate the effects of the treatment variables on the microstructure, mechanical properties, and recrystallization behavior. The as-received sheets were initially cold-rolled up to different reduction percentages of 60%, 75%, and 90%. Then, the cold-rolled samples were annealed at different temperatures of 500°C-700°C, for various time ranges of 5 to 60 minutes. The evolution of the microstructure of the samples was studied using X-ray diffraction analysis and optical microscopy. The hardness of the 90% cold-rolled sample was about 82% higher than that of the as-received sheet. Increasing the time and temperature of the annealing process caused a decrease in the microhardness values of the samples. The recrystallization activation energy and Avrami’s exponent of the 90% cold-rolled sample were calculated as about 179 kJ/mol and 0.75, respectively. The results of the uniaxial tensile tests revealed that the cold-rolling process significantly improved the yield strength (YS) and ultimate tensile strength (UTS) of the specimens. In the case of the 90% cold-rolled sample, these values improved by about 160% and 117% with respect to the as-received metal, respectively. However, the elongation of the cold-rolled samples dropped sharply. Moreover, annealing had a positive effect on the elongation of the cold-rolled samples. The UTS and elongation percentage of the as-received sheet were 415 MPa and 36.4%, respectively. These values were varied to 558 MPa and 29.15% for the 90% cold-rolled sample annealed at 700°C for 1 h. To study the fracture behavior of the different samples, scanning electron microscopy (SEM) was used.
کلیدواژه‌های انگلیسی مقاله Commercially pure titanium, Cold-rolling, Annealing, recrystallization, Mechanical properties
نویسندگان مقاله Y. Mazaheri |
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, 71946-84334, Iran

K. Ahmadi |
Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran

M.M. Jalilvand |
Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran

M. Bahiraei |
Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran

M. Sheikhi |
Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran

نشانی اینترنتی https://ijmf.shirazu.ac.ir/article_6627_1d4f93137e2cb7d37ceda2bc5ba3d7fc.pdf
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