بررسی ریزساختار پوشش‌های آلومینایدی اصلاح‌شده با سیلیسیم روی سوپرآلیاژ IN792 با فرایند فعالیت پایین به روش سمانتاسیون خارج از پودر

آذری بنی, علی; رستگاری, سعید; هاشمی نیاسری, مسعود

doi:10.30501/jamt.2026.577423.1359

بررسی ریزساختار پوشش‌های آلومینایدی اصلاح‌شده با سیلیسیم روی سوپرآلیاژ IN792 با فرایند فعالیت پایین به روش سمانتاسیون خارج از پودر

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

علی آذری بنی ¹

سعید رستگاری ²

مسعود هاشمی نیاسری ²

¹ دانشجوی دکتری، دانشکده‌ی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

² دانشیار، دانشکده‌ی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

10.30501/jamt.2026.577423.1359

چکیده

پوشش‌های آلومینایدی اصلاح‌شده با سیلیسیم علی‌رغم افزایش مقاومت به اکسیداسیون و خوردگی داغ، به دلیل تمرکز فازهای ترد سیلیسایدی در سطح پوشش، چقرمگی پایینی دارند. در این پژوهش، فرایند سمانتاسیون خارج از پودر با فعالیت پایین آلومینیم (دمای ۱۰۵۰ درجه‌ی سلسیوس، زمان ۲۴۰ دقیقه، اتمسفر آرگون) برای رسوب هم‌زمان آلومینیم و سیلیسیم روی سوپرآلیاژ IN792 به ‌کار گرفته شد. چهار مخلوط پودری با ۱۰ درصد وزنی آلومینیم ثابت و مقادیر متغیر سیلیسیم (صفر، ۵، ۱۰ و ۱۵ درصد وزنی) استفاده شد. پوشش آلومینایدی ساده (نمونه‌ی O) ساختاری دو لایه با ضخامت کل 5/45 میکرومتر (لایه‌ی خارجی 4/28 میکرومتر و ناحیه‌ی نفوذ متقابل (IDZ) 1/17 میکرومتر را نشان داد. افزودن سیلیسیم به‌طور غیرخطی ضخامت کل را کاهش داد: نمونه‌ی S1 (15 درصد وزنی سیلیسیم، 6/25 میکرومتر، بیشترین کاهش ضخامت)، نمونه‌ی S2 (10 درصد وزنی سیلیسیم، 4/44 میکرومتر) و نمونه‌ی S3 (5 درصد وزنی سیلیسیم، 5/42 میکرومتر). در همه‌ی نمونه‌ها، مکانیسم غالب رشد نفوذِ رو به بیرون نیکل بود که توسط EDS Mapping تأیید شده است. برخلاف فرایندهای با فعالیت بالا، سیلیسیم عمدتاً در ناحیه‌ی IDZ متمرکز شد و در لایه‌ی سطحی حضور چشمگیری نداشت. این توزیع عدم مشاهده‌ی پیک‌های سیلیسایدی در الگویXRD را توجیه می‌کند.

کلیدواژه‌ها

سوپرآلیاژ پایه‌ی نیکل

فرایند سمانتاسیون خارج از پودر

پوشش‌های آلومینایدی اصلاح‌شده با سیلیسیم

فعالیت پایین آلومینیم

موضوعات

پوششها

عنوان مقاله English

Microstructural Investigation of Silicon‑Modified Aluminide Coatings on IN792 Superalloy via Low‑Activity Out‑of‑Pack Cementation

نویسندگان English

Ali Azari Beni ¹

saeed rastegari ²

Masoud Hasheminiasari ²

¹ PhD Student, School of Materials and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Tehran, Iran.

² Associate Professor, School of Materials and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Tehran, Iran.

چکیده English

Silicon-modified aluminide coatings on nickel-based superalloys often suffer from brittleness due to surface-enriched silicide phases. This study introduces a low-activity out-of-pack cementation process conducted at 1050 °C for 240 min under argon to co-deposit Al and Si on the IN792 superalloy, aiming to confine brittle silicides to the inner regions while maintaining a ductile surface. Four powder mixtures with a fixed Al content of 10 wt.% and varying Si contents (0, 5, 10, and 15 wt.%) were used. The simple aluminide coating (sample O, 0% Si) exhibited a dual-layer structure with a total thickness of 45.5 µm, consisting of an outer β-NiAl layer (28.4 µm) and an interdiffusion zone (17.1 µm). The addition of Si reduced the total coating thickness in a nonlinear manner to 42.5 µm (5% Si, sample S3), 44.4 µm (10% Si, sample S2), and 25.6 µm (15% Si, sample S1). The highest Si content (15%) resulted in the greatest reduction, corresponding to an approximately 44% decrease compared with sample O. EDS mapping confirmed that outward Ni diffusion remained the dominant coating growth mechanism in all samples. Importantly, Si enrichment was observed primarily within the interdiffusion zone and at the coating/substrate interface rather than in the outer β-NiAl layer, explaining the absence of silicide peaks in the XRD patterns. This microstructure, consisting of a ductile β-NiAl surface layer over a silicide-rich subsurface region, offers a viable strategy for overcoming brittleness while retaining the oxidation resistance of Si-modified aluminide coatings.

کلیدواژه‌ها English

IN792 Superalloy

Out of Pack Cementation

Silicon Modified Aluminide Coatings

Low Activity Aluminizing

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