بررسی رسوب‌گذاری ناشی از کرنش فاز´γ در سوپرآلیاژ AD730 با استفاده از آزمایش رهایی تنش

نوع مقاله : مقاله پژوهشی

نویسندگان

زهرا میرزایی ¹

غلامرضا ابراهیمی ²

حمید رضا عزت پور ³

¹ گروه مهندسی مواد، دانشکده مهندسی، دانشگاه حکیم سبزواری، سبزوار.

² گروه مهندسی متالورژی و مواد، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد.

³ گروه مهندسی علم مواد، دانشکده مهندسی، دانشگاه ولی عصر رفسنجان، رفسنجان، ایران

10.22067/jmme.2025.92945.1203

چکیده

در پژوهش حاضر، تأثیر تغییرشکل بر رسوب‌گذاری فاز گاماپرایم (ʹγ) در سوپرآلیاژ پایه نیکل ریختگی AD730 با اندازه دانه اولیه درشت (بزرگتر از یک میلیمتر)، در محدوده دمایی ℃ 1050-950 و نرخ کرنش s-1 1/0 با استفاده از آزمایش رهایی تنش، بررسی شد. نتایج نشان داد زمانی که رسوب‌گذاری´γ اتفاق می‌افتد، تغییر شیب در منحنی‌های رهایی تنش (منحنی‌های تنش-زمان) رخ می‌دهد و رهایی تنش به تأخیر می‌افتد. منحنی رسوب‌گذاری-زمان-دما (PTT) نشان داد که با افزایش دمای آزمون رهایی تنش، از ℃ 950 به ℃ 1000، زمان شروع رسوب‌گذاری کاهش می‌یابد و سپس از دمای ℃ 1000 تا دمای ℃ 1050 افزایش می‌یابد که نشان دهنده تأثیر دما بر سینتیک رسوب‌گذاری ʹγ است. بررسی‌های ریزساختاری نشان داده است که با افزایش دمای آزمون و افزایش مدت زمان اعمال کرنش ثابت، اندازه رسوبات ʹγ با دو مکانیزم آگلومره شدن و رشد رقابتی، افزایش می‌یابد. با گذشت زمان و رسیدن به نقطه پایانی تغییر شیب، این رسوبات دیگر نقشی در استحکام بخشی ند‌ارند و شیب منحنی رهایی تنش مجدداً تغییر می‌کند و میزان کار نرمی افزایش می‌یابد.

کلیدواژه‌ها

سوپرآلیاژ پایه نیکل AD730

رسوب‌ گذاری دینامیکی

آزمون رهایی تنش

رسوب گاماپرایم (ʹγ)

موضوعات

• شکل دادن فلزات

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عنوان مقاله English

Investigation of Strain Induced Precipitation of γ' Phase of AD730 Ni base Superalloy Using Stress Relaxation Technique

نویسندگان English

Zahra Mirzaie ¹

Gholamreza Ebrahimi ²

Hamid Reza Ezatpour ³

¹ Department of Materials and Polymers Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.

² Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran

³ Department of Materials Engineering, Valieasr University of Rafsanjan, Rafsanjan, Iran

چکیده English

In the present work, the effect of deformation on the precipitation of the γʹ -phase in the as cast nickel-based superalloy of AD730 is investigated in the temperature range of 950-1050 °C and strain rate of 0.1 s-1, using the stress relaxation technique. It is indicated that γ´ precipitation leads to a slope change in the stress relaxation curves as a result of retardation of the stress relaxation in AD730. The precipitation-time-temperature (PTT) diagram shows that with increasing the test temperature from 950 ℃ to 1000 °C, the start time of precipitation decreases and then increases until the temperature of 1050 °C, which confirms the effect of temperature on the precipitation kinetics of γʹ phase. Microstructural studies designate that by increasing test temperature and duration time at constant strain, the size of γʹ precipitates increases with two mechanisms of agglomeration and competitive growth. The slope change at the end of the relaxation curves indicates that these precipitations play no role in strengthening as a result of the increase of softening work.

کلیدواژه‌ها English

AD730 Ni base superalloy

Dynamic precipitation

Stress relaxation test

γʹ precipitation

مراجع

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