اثر گرادیان دمایی روی تحولات ریزساختاری شمش ضخیم فولاد زنگ‌نزن آستنیتی نیترونیک 50 حین نورد داغ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

2 استاد، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر تهران، تهران، ایران

3 دانشیار، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر تهران، تهران، ایران

4 پژوهشگر، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر تهران، تهران، ایران

10.22034/ijme.2024.416957.1833

چکیده

اصلاح اندازه دانه از طریق تبلور مجدد دینامیکی یکی از راه­‌های مناسب جهت بهبود خواص مکانیکی شمش­‌های فولادهای زنگ‌نزن آستنیتی نیتروژن بالا حین نورد داغ می‌­باشد. در این مقاله با استفاده به شبیه‌­سازی بر پایه‌­ی المان محدود و نتایج تجربی، اثر نورد معمولی و نورد با گرادیان دمایی روی تحولات ریزساختاری شمش فولاد زنگ‌­نزن آستنیتی حاوی نیتروژن نیترونیک 50 حین نورد داغ مورد بررسی قرار گرفته است. نتایج حاصل از شبیه‌­سازی به­‌وسیله‌­ی آباکوس نشان داد که تحت شرایط گرادیان دمایی می­‌توان یکنواختی کرنش در سطح مقطع را افزایش داد. در حالی­‌که در شرایط نورد معمولی مقدار بیشینه کرنش در سطح نمونه است. نتایج ریز ساختاری حاصل از میکروسکوپ نوری برای نورد با گرادیان دمایی نشان داد میانگین اندازه دانه در مرکز شمش کمتر از سطح شمش بوده که نشان می‌­دهد مقدار تبلورمجدد در مرکز شمش بیش‌­از سطح نمونه است. اختلاف دما در مرکز نسبت به سطح نمونه منجر به کاهش قابل ملاحظه استحکام در مرکز شمش نسبت به سطح آن می­‌شود. اختلاف میانگین اندازه دانه­‌های تبلور مجدد دینامیکی شده در سطح و مرکز شمش برای نورد با گرادیان دمایی کمتر از  3 بود. وجود دانه‌­های اولیه (میانگین اندازه دانه  68) و مرزهای تحدب یافته در مرکز شمش و دانه­‌های یکنواخت و ریز در قسمت سطحی (  5/8) شمش تحت نورد معمولی ( 1000)، نشان داد که در مرکز شمش به دلیل پایین بودن دما و مقدار کرنش مؤثر، تبلور مجدد دینامیکی رخ نداده است. توزیع تقریباً یکنواخت دانه‌­های آستنیت در جهت ضخامت شمش برای نورد با گرادیان دمایی نشان داد که این روش، برای نورد داغ شمش فولاد آستنیتی روشی مناسب نسبت به شرایط نورد معمولی است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of gradient temperature on the microstructural evolution of Nitronic 50 austenitic stainless steel thick ingot during hot rolling

نویسندگان [English]

  • Arash Ghasemi 1
  • Seyed Mahdi Abbasi 2
  • Maryam Morakabati 3
  • Adly Akhondzadeh 4
1 PhD Candidate, Materials and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Iran
2 Professor, Faculty of Materials and Manufacturing Technologies, Malek-Ashtar University of Technology, Tehran, Iran
3 Associate professor, Faculty of Materials and Manufacturing Technologies, Malek-Ashtar University of Technology, Tehran, Iran
4 Researcher, Faculty of Materials and Manufacturing Technologies, Malek-Ashtar University of Technology, Tehran, Iran
چکیده [English]

Grain refinement through dynamic recrystallization is one way to improve the mechanical properties of high nitrogen austenitic stainless-steel ingots during hot rolling. In this paper, by using simulation based on the finite element method and experimental results, the effect of conventional rolling and gradient temperature rolling on the microstructural evolution of Nitronic 50 austenitic stainless-steel ingot during hot rolling is investigated. The results of simulations showed that strain in the center of the ingot be increased under a gradient temperature, while the maximum strain value in the conventional rolling is on the surface. The microstructural results obtained from optical microscopy for gradient temperature rolling showed strain value in the center is more than the surface. The temperature difference between the center and the surface leads to a significant reduction in the strength center of the ingot against the surface. The difference in average grain size of dynamic recrystallized for gradient temperature in the surface and center was less than 3μm. The existence of primary grains (68μm average grain size) and bulged grain boundaries in the center of ingot and refinement and small grains in the surface area (8.5μm) in conventional rolling (1000℃) showed that dynamic recrystallization, due to low effective strain and temperature, has not occurred in the center of the ingot. The almost uniform distribution of austenite grains in the direction of ingot thickness for gradient temperature rolling showed that this method is an appropriate method for hot rolling of austenitic steel ingots compared to conventional conditions.

کلیدواژه‌ها [English]

  • Simulation
  • Gradient Temperature Rolling
  • Microstructural Evolution
  • Stainless Steels

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