مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

معرفی یک روش تغییر شکل پلاستیکی شدید جدید با پتانسیل تولید لوله‌های فوق ریزدانه نسبتاً بلند

نوع مقاله : پژوهشی اصیل

نویسندگان
محمد افتخاری 1
قادر فرجی 2
مصطفی بهرامی 3
1 دانشجوی دکتری، مهندسی مکانیک، دانشگاه تهران
2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه تهران
3 کارشناس ارشد، مهندسی مکانیک، دانشگاه تهران
چکیده
در پژوهش حاضر، روش جدیدی به نام فرآیند اکسترود شدن فشاری تناوبی هیدرواستاتیک لوله، معرفی شده است که با بهره‌­گیری از سیال تحت فشار و نیز با نیروی مناسب پرس، علاوه بر این­که قابلیت تغییرشکل پلاستیک شدید و بهبود ریزساختار و خواص مکانیکی قطعات لوله­‌ای شکل را دارد بلکه پتانسیل­ تولید لوله­‌هایی با طول­ نسبتاً بلند را نیز دارا می­باشد. در این پژوهش، با انجام آزمون­‌های تجربی معین، خواص ریزساختاری و خواص مکانیکی لوله­‌هایی از جنس مس خالص که مورد انجام فرآیند اکسترود شدن فشاری تناوبی هیدرواستاتیک واقع شده بودند، مورد مطالعه قرار گرفت. مشاهدات حاکی از آن بود که این فرآیند با موفقیت بر روی مس خالص انجام گرفت و خواص ریزساختاری و خواص مکانیکی آن، بهبود قابل­‌توجهی پیدا کرد. برای مثال، پس از انجام این فرآیند، استحکام نهایی مس، 57/1 برابر، استحکام تسلیم، 85/1 برابر و سختی، 86/1 برابر شد و نیز افت داکتیلیتی پایینی مشاهده گردید. همچنین، پس از انجام این فرایند، ساختاری با سلول­‌های فوق ریز با اندازه­‌ی میانگین در حدود 990 نانومتر ایجاد شد. این در حالی بود که میانگین اندازه­‌ی دانه برای لوله­‌ی فرآیند نشده در حدود 40 میکرومتر بود. روال تشکیل ریزساختار مشاهده شده، عبارت است از: تولید چگالی زیادی از نابه­‌جایی­‌ها، برخورد نابه­‌جایی­‌ها به هم و تشکیل ساختارهای در هم تنیده شده­، آرایش گرفتن نابه­‌جایی­‌ها و تشکیل مرزهای کم-زاویه­ و سپس تشکیل سلول­‌ها به منظور تقلیل انرژی کرنش، ایجاد نابه­‌جایی­‌های جدید و حرکت آن‌­ها به سوی مرز­ها.
کلیدواژه‌ها
تغییر شکل پلاستیک شدید
لوله
مس خالص
خواص مکانیکی
فوق ریزدانه

موضوعات

عنوان مقاله English

A Novel Severe Plastic Deformation Technique with Potential for Producing Relatively Long Ultrafine Grained Tubes

نویسندگان English

Mohammad Eftekhari 1
Ghader Faraji 2
Mostafa Bahrami 3
1 Ph.D. Student,Department of Mechanical Engineering, University of Tehran
2 Associate Professor, College of Engineering / Faculty of Mechanical Engineering, University of Tehran
3 Master graduate,Department of Mechanical Engineering, University of Tehran
چکیده English

In present study, hydrostatic tube cyclic extrusion compression process is introduced as a novel severe plastic deformation process for grain refining and improving mechanical properties of tubular components. Also, this process has the potential to produce relatively long and large tubes. In this process, because of the utilization of pressurized hydraulic fluid between the tube and die, there is nearly no contact friction. This leads to a significant reduction in pressing load. In this research, after applying hydrostatic tube cyclic extrusion compression process on pure copper tube, the microstructure evolution and the mechanical properties improvement were examined. The results denoted that this process was successfully performed on pure copper tube. In this way, the microstructure and mechanical properties were improved significantly. For example, after this process, the ultimate strength of pure copper, the yield strength and the value of hardness became 1.57, 1.85 and 1.86 times higher, respectively, and a low loss of ductility was achieved. Also, after this process, an ultrafine cellular microstructure with average size of about 990 nm were observed. While, the average value of grain size for the unprocessed tube was about 40 μm. The stages of the formation of the observed microstructure are as follows: the creation of a high density of dislocations, the dislocations coalescence with each other and the formation of tangled structures, the formation of ordered arrangements of dislocations and low angle boundaries, the formation of dislocation cells to diminish strain energy, the creation of new dislocations and their movement to boundaries.

کلیدواژه‌ها English

Severe plastic deformation
Tube
Pure copper
Mechanical properties
Ultra-fine grain
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مهندسی مکانیک مدرس
دوره 21، شماره 10
مهر 1400
صفحه 661-672