Abstract
Rapid electric current heat treatment has been successfully applied to a cold-rolled sheet of commercially pure titanium (CP Ti). The electric current heat treatment was conducted at various temperatures (400, 500, 600 and 700 °C) by altering the current density (A/mm2). The detailed microstructure and texture evolution was studied using electron backscatter and X-ray diffraction analysis. For comparison, conventional heat treatment at 400, 500 and 600 °C were also applied to the cold-rolled sheets. The electrically heat-treated sample showed a much smaller and uniform grain size with a relatively weak texture than the conventionally heat-treated one. As a result, the electrically heat-treated samples exhibited better tensile properties than conventionally heat-treated samples. Furthermore, the electric current treatment produced minimum sheet distortion and good oxidation resistance compared with the conventional heat treatment.
Highlights
Recent years have witnessed significant interest in commercially pure titanium (CP Ti) for power generation, electrochemical and biomedical industries owing to its exceptional corrosion resistance, biocompatibility and high specific strength over other metallic materials [1,2]
We previously reported that cold rolling and cryogenic rolling can help the enhancement of the yield strength of CP Ti sheets up to a range of 700–900 MPa under the as-rolled condition, attributed to the formation of a twinning-induced ultrafine-grained microstructure [16,17]
The present study revealed that the electric current heat treatment has considerable benefits as compared with the conventional heat treatment
Summary
Recent years have witnessed significant interest in commercially pure titanium (CP Ti) for power generation, electrochemical and biomedical industries owing to its exceptional corrosion resistance, biocompatibility and high specific strength over other metallic materials [1,2]. Owing to the high density of low-angle boundaries and dislocations, severely deformed CP Ti sheets tend to exhibit low ductility and formability Applying heat treatment, such as stress relieving and annealing, to deformed materials can effectively improve their microstructure and mechanical properties, ductility and fatigue performance [18,19]. Several researchers have been found the formation of ultrafine-grained microstructure and improved mechanical properties of various alloy systems utilizing the electric heat treatment [29,30,31,32]. An attempt was made to modify the microstructure and texture by applying an electric current treatment to increase the ductility Such an improvement in the strength–ductility balance was realized by grain growth restriction and the development of a weak texture. The benefits of electric current treatment in terms of specimen geometry, oxidation resistance, mechanical properties and microstructural analyses are discussed
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