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

محورهای موضوعی : 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)

تاریخ دریافت : 1395/11/23 تاریخ پذیرش : 1395/11/23 تاریخ انتشار : 1395/11/01

کلید واژه: تحلیل اجزای محدود, استحاله‌های فازی, سرمایش پیوسته, مدل سینتیکی,

چکیده مقاله :

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.

چکیده انگلیسی:

In the present research, the finite element analysis of the surface transformation hardening in the vicinity of workpiece discontinuity was performed both thermally and metallurgically using ABAQUS finite element software. In order to predict the volume fraction of the obtained phases and the hardness profile during continuous cooling stage, the appropriate user-defined subroutine based on the Kirkaldy kinetic model was employed in the data flow of the software. Besides the effects of different controlling strategies and the application of a quenching medium at the discontinuity surface was investigated. Based on the obtained results, these strategies which are based on controlling the input power and travelling speed of the heat source as a function of the maximum temperature at the surface, allows for gaining a more uniform thermal history at the surface. However, as these strategies could not control the cooling rate in the vicinity of discontinuities, applying a quenching medium with an optimum cooling power is essential in order to achieve a uniform hardened layer at the workpiece depth.

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