مطالعه اثر سرعت اسکن و توان لیزر بر حوضچه مذاب در فرآیند ذوب انتخابی لیزر به کمک معادلات حرکت مذاب برای Ti6Al4V

نوع مقاله : گرایش ساخت و تولید

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

2 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین ع، تهران، ایران

3 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین (ع)، تهران، ایران

چکیده

روش ذوب انتخابی لیزر، یکی از روش‌های ساخت افزایشی است که در آن قطعات با ساختارهای هندسی متنوع به‌صورت لایه به لایه، توسط ذوب پودر فلز ایجاد می­شود. گرادیان دما در محل ذوب، به پارامترهای فرآیند مانند سرعت اسکن و توان لیزر وابسته است که بر روی ابعاد حوضچه مذاب و کیفیت سطح تأثیر دارد. با توجه به ماهیت گذرا و ابعاد بسیار کوچک حوضچه مذاب، کنترل و اندازه‌گیری گرادیان دمای ایجاد شده و ابعاد حوضچه مذاب نسبتاً دشوار است. در این مقاله از یک مدل اجزای محدود جهت تحلیل فرآیند و مطالعه اثر سرعت اسکن و توان لیزر، بر روی بستری از آلیاژ Ti6Al4V  استفاده شده است. در این مطالعه ابتدا معادلات نظریه لیزر بررسی شد و پس از مدل‌سازی، صحت لیزر مدل شده با نمونه تجربی مورد مقایسه قرار گرفت. پس از صحت‌سنجی مدل‌سازی لیزر، فرآیند ذوب انتخابی لیزر بررسی و تحلیل اجزای محدود برای توان­ و سرعت­های مختلف انجام شد. برای مدل‌سازی از فیزیک‌های مختلفی در نرم‌افزار، به‌طور هم‌زمان شامل انتقال حرارت همراه با معادلات تغییر فاز جامد به مایع، تنش سطحی (اثر مارانگونی) و جریان آرام سیال (معادلات ناویراستوکس) همراه با اثر گرانش استفاده شد. ابعاد حوضچه مذاب، گرادیان دما در راستاهای مسیر حرکت لیزر، پهنا و عمق لایه مذاب و همچنین بررسی پیدایش عیب اثر توپی شدن، مورد مطالعه قرار گرفته است. نتایج مدل عددی جهت صحت­سنجی با مدل تجربی مقایسه شد که سازگاری مناسبی را با نمونه تجربی نشان می‌دهد.

کلیدواژه‌ها

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سابقه مقاله

  • تاریخ دریافت: 24 شهریور 1399
  • تاریخ بازنگری: 14 بهمن 1399
  • تاریخ پذیرش: 27 آذر 1400
  • تاریخ انتشار: 01 آبان 1400

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