مهندسی متالورژی

مهندسی متالورژی

بررسی ساختار و سختی لوله مسی در طی تغییر شکل پلاستیک شدید به روش TCEC

نوع مقاله : مقاله پژوهشی

نویسندگان
علیرضا احمدی 1
بهمن میرزاخانی 2
یوسف پاینده 3
1 دانشجوی کارشناسی ارشد، گروه مهندسی مواد و متالورژی، دانشکده فنی- مهندسی، دانشگاه اراک، اراک، ایران.
2 دانشیار، گروه مهندسی مواد و متالورژی، دانشکده فنی- مهندسی، دانشگاه اراک، اراک، ایران.
3 استادیار، گروه مهندسی مواد و متالورژی، دانشکده فنی- مهندسی، دانشگاه اراک، اراک، ایران.
10.22076/me.2023.1999760.1379
چکیده
   لوله­ های مس خالص در صنایع مختلف کاربرد وسیعی دارند. اما لازم است خواص مکانیکی آن­ها بهبود پیدا کند. یکی از روش­های بهبود، اعمال تغییر شکل پلاستیک شدید SPD[1] به منظور دستیابی به ساختار
فوق­ریزدانه است. در این تحقیق از روش تغییر شکل به نام اکستروژن- فشار متناوب لوله [2]TCEC برای انجام تغییرشکل پلاستیک شدید لوله مسی استفاده گردید. برای این منظور به کمک نرم افزار Solidwork طراحی سه بعدی قالب و سنبه انجام و ساخت قالب صورت گرفت. سپس با موفقیت بر روی لوله­ی مسی خالص در دمای محیط و دمای 750 درجه سانتیگراد طی یک مرحله انجام شد. بررسی تحولات ریزساختاری و
سختی­سنجی روی نمونه­ها نشان داد که در عملیات TCEC سرد، ساختار سطح مقطع اندکی ریزدانه شده است و به نسبت نمونه­ی خام، بهبود سختی قابل توجهی در حدود 60% صورت می­گیرد. همچنین در ساختار، کشیدگی دانه­ها و سیلان ماده در جهت اکستروژن مشاهده می­شود. در عملیات TCEC گرم، سطح مقطع نمونه به شکل قابل ملاحظه­ای به دلیل وقوع تبلورمجدد دینامیکی ریزدانه شده و سختی این قسمت به نسبت نمونه­ی خام به شکل چشم­گیری در حدود 93% افزایش یافته است.
کلیدواژه‌ها
مس خالص
تغییر شکل پلاستیک شدید
اکستروژن- فشار سیکلی لوله (TCEC)
دانه
سختی

عنوان مقاله English

Investigation on Macrostructure and Hardness of Cu Tubes Processed by Tubular Cyclic Extrusion-Compression

نویسندگان English

Alireza Ahmadi 1
Bahman Mirzakhani 2
Yousef Payandeh 3
1 MSc Student, Department of Materials Science and Engineering, Faculty of Engineering, Arak University, Arak, Iran.
2 Associated professor, department of Materials Science and Engineering, Faculty of Engineering, Arak University, Arak, Iran.
3 Assistant professor, Department of Materials Science and Engineering, Faculty of Engineering, Arak University, Arak, Iran.
چکیده 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

Pure copper
severe plastic deformation
Tube Cyclic Extrusion-Compression (TCEC)
Grain
Hardnes
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  • تاریخ دریافت 18 اردیبهشت 1402
  • تاریخ بازنگری 17 مهر 1402
  • تاریخ پذیرش 15 آذر 1402