نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه اراک
2 گروه مهندسی مواد و متالورژی، دانشکده فنی- مهندسی، دانشگاه اراک، اراک
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Pure copper pipes have various applications in industries. It is necessary to improve their mechanical properties. The main strengthening mechanism in this case is severe plastic deformation in order to achieve ultrafine-grain microstructure. In this research, the deformation method of tube cyclic extrusion-compression (TCEC) was used. The design of punch and mould was performed by Solidwork and Mo40 steel was used for manufacture of both mould and punch. Then, the pure copper tube at ambient temperature and 750 °C deformed in one pass. Investigation of microstructural evaluation and hardness measurement on the cross-sectional surface and side surface of the pipe showed that in the case of cold TCECed pipe, the microstructure of the cross-section is slightly fine-grain and compared to the raw sample, a substantial hardness improvement (60%) was achieved. In the microstructure, orientation of grains and material flow were also observed in the direction of extrusion. In the hot SPD treatment, the cross-sectional area of the sample significantly was fine-grained and the hardness of this part increased considerably by about 93% compared to the raw sample.
کلیدواژهها [English]
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