ریزساختار و سختی آلیاژ Ti-6242 ساخته‌شده به‌روش‌های ذوب بستر پودر با پرتوی الکترونی و ذوب بستر پودر با لیزر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، اصفهان 83111-84156، ایران

2 دانشکده مدیریت و مهندسی تولید، دانشگاه پلی تکنیک تورین، تورین 10129، ایتالیا

چکیده

مقدمه و اهداف: آلیاژ Ti-6Al-2Sn-4Zr-2Mo (Ti6242) یک آلیاژ تیتانیوم شبه‌آلفا با کاربرد گسترده در صنایع زیست‌پزشکی، خودرو و حمل و نقل هوایی و با مقاومت حرارتی بالا است. هدف این پژوهش، مقایسه ریزساختار و سختی نمونه‌های ساخته شده از این آلیاژ به دو روش ذوب بستر پودر با لیزر و ذوب بستر پودر با پرتوی الکترونی است.
مواد و روش‌ها: ریزساختار و سختی نمونه‌های آلیاژ Ti6242 تولید شده به این دو روش با استفاده از روش‌های میکروسکوپی نوری و الکترونی روبشی، پراش پرتو ایکس و سختی‌سنجی ویکرز ارزیابی شد.
یافته‌ها: میزان تخلخل هر دو نمونه در بازه‌ قابل قبول برای فرایندهای ذوب بستر پودر بود. ریزساختار نمونه‌ها شامل دانه‌های ستونی β اولیه حاوی فاز مارتنزیتی ά برای فرایند ذوب بستر پودر با لیزر و فازهای لایه‌ای β+α با ریخت ویدمن‌اشتاتن و سبدبافت و پرگنه‌های α برای فرایند ذوب بستر پودر با پرتوی الکترونی بود. نمودارهای ویلیام‌سون-هال، ریزکرنش بالاتر شبکه‌ در فرایند ذوب بستر پودر با لیزر را نشان داد. سختی متوسط در نمونه‌های ذوب بستر پودر با پرتوی الکترونی و ذوب بستر پودر با لیزر به‌ترتیب نزدیک به HV 408 و HV 401 به‌دست آمد.
نتیجه‌گیری: هر دو روش استفاده شده قابلیت تولید قطعات با درصد تخلخل قابل قبول را دارند. ریزساختار دو نمونه به دلیل تفاوت‌ها در تاریخچه حرارتی آنها کاملا مشابه نیست. ریزکرنش شبکه‌ای کمتر و سختی بالاتر از ویژگی‌های نمونه ذوب بستر پودر با پرتوی الکترونی در مقایسه با نمونه ذوب بستر پودر با لیزر است. سختی هر دو نمونه از سختی نمونه‌های ساخته شده به‌روش‌های سنتی بیشتر است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Microstructure and Hardness of Ti-6242 Alloy Fabricated by Electron Beam Powder Bed Fusion and Laser Powder Bed Fusion Methods

نویسندگان [English]

  • Amir Hossein Emami Ghalehghasemi 1
  • Abolfazl Azadi 1
  • Behzad Niroumand 1
  • Manuela Galati 2
  • Abdollah Saboori 2
1 Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2 Department of Management and Production Engineering, Politecnico di Torino, 10129, Torino, Italy
چکیده [English]

Introduction and Objectives: Ti-6Al-2Sn-4Zr-2Mo (Ti6242) alloy is a near-alpha titanium alloy widely used in biomedical, automobile, and aviation industries, known for having a high service temperature. The objectives of this study are to compare the electron beam melting and selected laser melting techniques in terms of the microstructure and hardness developed in Ti6242 alloy.
Materials and Methods: Microstructure and hardness of Ti6242 alloy samples produced by the two-powder bed fusion techniques were analyzed using optical and scanning electron microscopy, X-ray diffractometry, and Vickers hardness test.
Results: The porosity levels in both samples were within the acceptable ranges for powder bed fusion processes. The solidified microstructure of laser powder bed fusion samples consisted of columnar β grains with martensitic α' phase, and that of electron beam powder bed fusion sample consisted of lamellar α+β phases with Widmanstätten and basketweave morphology and α colonies. Williamson-Hall plots revealed higher lattice microstrain in the laser powder bed fusion process. The average hardness values of electron beam powder bed fusion and laser powder bed fusion samples were approximately 408 HV and 401 HV.
Conclusion: Both powder bed fusion techniques employed were capable of producing samples of acceptable porosity levels. The solidified microstructures of the two techniques were somewhat different due to different heating and cooling histories experienced. The electron beam powder bed fusion sample enjoyed smaller lattice microstrain and higher hardness than the laser beam powder bed fusion sample. Hardness of both samples was higher than those of the conventionally fabricated components.

کلیدواژه‌ها [English]

  • Additive Manufacturing
  • Electron Beam Powder Bed Fusion
  • Laser Powder Bed Fusion
  • Ti6242 alloy
  • Microstructure

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