تحلیل اجزای محدود اعمال راهبرد کنترل توان در فرآیند سخت گردانی استحاله ای سطحی در مجاورت ناپیوستگی در عمق نمونه

الموضوعات : فصلنامه علمی - پژوهشی مواد نوین

آرش خواجه ¹ (دانشجوی دکتری، بخش مهندسی مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران)
سید احمد جنابعلی جهرمی ² (استاد، بخش مهندسی مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران)
حبیب دانش منش ³ (دانشیار، بخش مهندسی مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران)

تاريخ الإرسال : 14 السبت , جمادى الأولى, 1438 تاريخ التأكيد : 14 السبت , جمادى الأولى, 1438 تاريخ الإصدار : 22 الجمعة , ربيع الثاني, 1438

الکلمات المفتاحية: تحلیل اجزای محدود, استحاله‌های فازی, سرمایش پیوسته, مدل سینتیکی,

ملخص المقالة :

این پژوهش به تحلیل اجزای محدود فرآیند سخت گردانی استحاله‌ای سطحی در مجاورت ناپیوستگی در عمق نمونه به صورت حرارتی و متالورژیکی به کمک نرم افزار اجزای محدود ABAQUS می‌پردازد. به منظور پیش بینی جزء حجمی فازهای ایجاد شده و سختی نهایی در حین سرمایش پیوسته، از یک زیر روال که به وسیله کاربر براساس مدل سینتیکی Kirkaldy تعریف گردیده است در گردش اطلاعات نرم افزار استفاده شد. افزون برآن، تاثیر راهبرد کنترل توان و اعمال محیط خنک کننده در سطح ناپیوستگی بررسی گردید. بر اساس نتایج بدست آمده، این راهبردها که بر مبنای کنترل توان ورودی منبع حرارتی است، امکان دستیابی به یک تاریخچه حرارتی یکنواخت‌تر را در سطح میسر می‌کنند. با این وجود، با توجه به اینکه اعمال این راهبرد، قادر به کنترل نرخ سرمایش در اطراف ناپیوستگی‌ها نمی‌باشد، استفاده از یک محیط سرد کننده با قدرتی بهینه جهت دستیابی به یک لایه یکنواخت سخت شده در عمق نمونه به همراه این راهبردها ضروری است.

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