مطالعه تاثیر فرایند اکستروژن متناوبی فشاری پروفیل سبک غیرمتقارن (NCTS-CEC) در تولید تیرهای با مقاطع غیرمتقارن ریزدانه با استحکام بالا از جنس منیزیم AM60

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه ساخت و تولید، دانشگاه آزاد اسلامی، واحد تبریز، تبریز، ایران

2 دانشجوی کارشناسی ارشد، گروه ساخت و تولید، دانشگاه آزاد اسلامی، واحد تبریز، تبریز، ایران

10.22034/ijme.2023.407082.1808

چکیده

در تحقیق حاضر، روش اکستروژن متناوبی فشاری پروفیل سبک غیرمتقارن (NCTS-CEC) به عنوان روشی جدید جهت تغییر شکل پلاستیک شدید تیرهای با مقطع غیر­متقارن مورد مطالعه قرار گرفته است. در این روش کل طول تیر غیر­متقارن با پروفیل L شکل از یک قالب گلویی عبور کرده و تحت تاثیر تغییر­ شکل پلاستیک شدید قرار می­‌گیرد. با انجام پاس­‌های بیشتر فرایندی می­‌توان کرنش پلاستیک تجمعی دلخواه با مقادیر بالاتر را به ماده اعمال نمود. در بخش اول مطالعات تجربی، نمونه‌­های پروفیلی با مقطع L از جنس منیزیم AM60 آماده­‌سازی شده و در مجموعه قالب قرار گرفت و توسط سنبه­‌ای در سیکل‌­های مختلف تحت تاثیر تغییر شکل پلاستیک قرار گرفت. تحول ریز­ساختاری نمونه‌­های تغییر­شکل یافته توسط میکروسکوپ نوری و الکترونی عبوری نشان داد که بیشترین تغییرات اندازه دانه در انتهای فرایند و پس از اعمال دو پاس از مقدار اولیه 75 میکرون به مقدار 5 میکرون اتفاق افتاد. در ادامه، بررسی­‌های خصوصیات مکانیکی و میکرو­سختی‌­سنجی بر روی نمونه­‌های اولیه و تغییر شکل یافته حاکی از افزایش استحکام تسلیم و حداکثر از مقادیر اولیه به ترتیب 5/89  و 3/227 به 9/136 و 7/286 مگاپاسکال و همچنین افزایش میکرو­سختی ویکرز از مقدار اولیه 54 به مقدار 89 ویکرز می‌باشد. از طرف دیگر مقدار انعطاف­‌پذیری نمونه­‌های تغییر­ شکل یافته به دلیل تحول ریزساختاری و خرد شدن فازهای یوتکتیک و کاهش اندازه دانه از 3/11% به 4/14% افزایش یافته است. روش شبیه­‌سازی عددی اتومات سلولی جهت پیش‌­بینی تحول ریز­ساختاری نمونه­‌های تغییر­ شکل­ یافته به کار گرفته شد. نتایج به دست آمده حاکی از مطابقت قابل قبول روش شبیه‌­سازی و آزمایشات تجربی دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Study of the cyclic extrusion–compression in production of high stringed and ultrafine grained AM60 Magnesium noncircular thin section beams

نویسندگان [English]

  • Hossein Jafarzadeh 1
  • Karim Alizadi Balegh 2
1 Assistant Professor, Department of Manufacturing Engineering, Islamic Azad University, Tabriz branch, Tabriz, Iran
2 MSc Student, Department of Manufacturing Engineering, Islamic Azad University, Tabriz branch, Tabriz, Iran
چکیده [English]

In this study a new severe plastic deformation method named noncircular thin section cyclic extrusion–compression (NCTS-CEC) is proposed for processing ultrafine-grained noncircular thin section beams. In this technique, the total length of noncircular L shaped section is passed through a neck zone and experiences severe plastic strains. Therefore, the high amount of accumulated plastic strain could be imposed by repeating the number of process cycles. In the first section of study, the AM60 Magnesium alloy is inserted into die and deformed by punch in different cycles. The observations by optical and SEM microscopes showed the formation of about 5 μm fine grains from the initial value of 75 μm after processing by two cycles of the NCTS-CEC. Also, the mechanical properties including yield strength, UTS, elongation and microhardness are evaluated at different cycles of NCTS-CEC processing. The obtained results showed the increase of yield strength and UTS to 136.9MPa and 286.7 MPa from the initial values of 89.5 MPa and 227.3 MPa, respectively. The Vickers microhardness is increased to 89HV from the initial value of 54HV at the end of second cycle. Also, the elongation of processed sample is increased to 14.4% from 11.3% due to texture evolution, grain refinement and breakage of brittle eutectic phases at the end of second cycle. The cellular automaton (CA) finite element method was implemented to simulate the process to predict the microstructure evolution of AM60. The obtained results from cellular automaton finite element (CAFE) and experimental methods were in good agreement.

کلیدواژه‌ها [English]

  • Cyclic Extrusion and Compression
  • AM60 Magnesium Alloy
  • FEM
  • Cellular Automaton (CA)

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