بررسی ریزساختار و ریزسختی سوپرآلیاژ اینکونل 792 پس از عملیات کوبش شوک لیزری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه بیرجند، بیرجند

2 دانشکده مهندسی مکانیک و مواد، دانشگاه صنعتی بیرجند، بیرجند

3 دانشکده فیزیک، دانشگاه ولیعصر رفسجان، رفسنجان

چکیده

استفاده از عملیات کوبش شوک لیزری به عنوان روشی نوین باعث ایجاد تنش‌های فشاری کنترل شده در سطح مواد و افزایش طول عمر مفید آنها خصوصا در محیط‌های حساس به تنش می‌گردد. در پژوهش حاضر اثر تغییر اندازه اشعه لیزر بر ریزساختار و ریزسختی سوپرآلیاژ اینکونل 792 ریخته‌گری شده پس از این عملیات بررسی شده است. از تحلیل پراش پرتو ایکس جهت شناسایی فازها و تعیین مقدار تنش پسماند سطحی و از میکروسکوپ نوری جهت مطالعه ریزساختار و فازهای تشکیل شده پس از حکاکی شیمیایی استفاده شده است. تنش‌های پسماند ایجاد شده در ساختار دندریتی ماده شامل فازهای گاما و گاما پرایم تایید گردید. در اثر این عملیات، مساحت دانه‌ها در نزدیکی سطح تا حدود 62% کاهش یافت. این در حالی است که ریزسختی ماده تا عمق 2 میلی‌متری، افزایش 30 درصدی را نشان داد و تنش پسماند از حالت کششی به فشاری به مقدار 290 مگاپاسکال تغییر یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Microstructure and Microhardness of Inconel 792 Superalloy After Laser Shock Peening

نویسندگان [English]

  • Mahdiyeh Khosravi Khezri 1
  • Seyed Yousef Ahmadi Brooghani 1
  • Yadollah Yaghoubinezhad 2
  • Mohammad khanzadeh 3
1 Faculty of Mechanical Engineering, University of Birjand, Birjand, Iran.
2 Faculty of Materials Engineering of Birjand University of Technology, Birjand, Iran.
3 Faculty of Physics of Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.
چکیده [English]

The use of laser shock peening (LSP) as a novel surface treatment generates controlled compressive residual stresses in materials, thereby enhancing their service life, particularly in stress‑sensitive environments. In the present study, the effect of varying the laser beam diameter on the microstructure and microhardness of cast Inconel 792 superalloy subjected to LSP was investigated. X‑ray diffraction (XRD) analysis was employed to identify the phases and quantify the surface residual stresses, while optical microscopy was used to examine the microstructure and the phases formed after chemical etching. The results confirmed the presence of residual stresses within the dendritic microstructure of the γ and γ′ phases. LSP produced significant grain refinement near the surface, leading to a reduction in grain area by approximately 62 %. Meanwhile, the microhardness of the treated region increased by 30 % up to a depth of 2 mm, and the residual stress was transformed from tensile to compressive, reaching about 290 MPa. These findings demonstrate that laser shock peening can effectively induce high compressive residual stress and promote surface grain refinement in Inconel 792, resulting in improved mechanical properties and enhanced durability under demanding service conditions.

کلیدواژه‌ها [English]

  • Laser shock peening
  • Inconel 792
  • Microstructure
  • Microhardness
  • Residual stress

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