بررسی تغییرات ریزساختار تیتانیوم خالص تجاری در شکل‌دهی دورانی گرم مقاومتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، مهندسی ساخت و تولید، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

2 دانشیار، مهندسی مکانیک ساخت و تولید، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

در این تحقیق تأثیر تغییرات شدت جریان بر تغییرات ریزساختار شکل­‌دهی دورانی گرم مقاومتی تیتانیوم خالص تجاری بررسی شده است. بدین منظور، مجموعه‌­ای جهت اعمال گرمایش مقاومتی به ورق تعبیه گردید و پیکربندی دستگاه به گونه‌­ای طراحی و ساخته شد که در حین فرایند شکل‌­دهی چرخشی، بتوان همزمان گرمایش مقاومتی را اعمال کرده و ورق­‌های تیتانیوم را به صورت مخروط ناقص تحت فرایند شکل‌­دهی دورانی گرم مقاومتی قرار داد. سپس، با انجام آزمایش در شرایط مختلف شکل­‌دهی با تغییر در شدت جریان عبوری در ضخامت و نرخ باردهی ثابت، قطعات مختلفی بدست آمده و ریزساختار ماده و دانه­‌بندی آن، در حالت­‌های مختلف شکل‌­دهی و در قسمت­‌های مختلف آن مورد مطالعه قرار گرفته است. نتایج به دست آمده از این پژوهش نشان می­‌دهد که نیروی اعمالی در شکل­‌دهی دورانی در گرمکاری مقاومتی در همه شدت­‌های جریان سبب ریزدانه شدن ماده شده است اما از یک میزان شدت جریان مشخص، ماده بعد از اتمام تبلور مجدد فرصت بیشتری داشته که در دماهای بالاتر بماند و به این خاطر امکان بیشتری برای رشد دانه­‌های تبلور مجدد یافته فراهم بوده است. همچنین تغییرات سختی در مقیاس ویکرز نیز در شدت جریان­‌های مختلف نشان می‌­دهد که با افزایش شدت جریان در تمام قسمت­‌های قطعه، سختی آن افزایش یافته که این نرخ افزایش در قسمت­‌های دیواره قطعه که تحت تنش­‌های مکانیکی حاصل از نیروهای ابزار نیز قرار داشته بیشتر از کف قطعه بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the microstructure variation of commercially pure titanium in hot resistance spinning

نویسندگان [English]

  • Mohsen Ghafari 1
  • Majid Elyasi 2
  • Mohammad Javad Mirnia 2
1 Mechanical Department, Babol Noshirvani University of Technology, Babol, Iran
2 Mechanical Department, Babol Noshirvani University of Technology, Babol, Iran
چکیده [English]

In this paper, the effect of current intensity on changes in the microstructure of the hot resistance spinning of commercially pure titanium alloy has been investigated. For this purpose, a set-up for applying resistance heating to the sheet was installed and the configuration of the machine was designed and built in such a way that during the spinning process, resistance heating can be applied simultaneously and titanium sheets can be made into cones. The incomplete part was subjected to the hot resistance spinning process. Then, by conducting experiments in different forming conditions with a change in the intensity of the passing current at a constant thickness and feedrate, different parts were obtained and the microstructure of the material and its granulation, in different forming states and in the part of its various aspects have been studied. The results from this research show that the force applied in spinning in resistance heating at all current intensities has caused the material to become fine. But from a certain current intensity, the material has more time after the completion of recrystallization to remain at higher temperatures, and because of this, there is a greater possibility for the growth of recrystallized grains. Also, the hardness changes in the Vickers scale in the intensity of different currents show that with the increase in the intensity of the current in all parts of the piece, its hardness has increased. Moreover the rate of increase in the parts of the wall of the piece that are under the result of mechanical stresses among the forces of the tool was more than the bottom of the part.

کلیدواژه‌ها [English]

  • Hot spinning
  • Microstructure
  • Grain Size
  • Recrystallization
  • Hardness
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