ذوب سطحی و بررسی اثر اندازۀ ذرات و غلظت کاربید تیتانیم بر مورفولوژی کاربیدهای MC در آلیاژسازی فولاد AISI H13 با لیزر پالسی

محورهای موضوعی : روش ها و فرآیندهای نوین در تولید

محمدعلی بوترابی ¹ , علی دادو ² , شهرام خیراندیش ³

1 - دانشگاه علم و صنعت ایران
2 - دانشجوی دکترا، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران
3 - عضو هیأت علمی دانشگاه علم و صنعت ایران

تاریخ دریافت : 1397/08/09 تاریخ پذیرش : 1398/05/15 تاریخ انتشار : 1398/08/01

کلید واژه: پوشش کامپوزیتی, ذوب سطحی با لیزر, آلیاژسازی سطحی با لیزر, کاربید MC, مورفولوژی رشد,

چکیده مقاله :

در این پژوهش، ریزساختار حاصل از ذوب سطحی فولاد AISI H13 با لیزر پالسی Nd:YAG مطالعه شد. سپس با آلیاژسازی سطح با پودر TiC، اثر اندازه ذرات و غلظت پودر بر ریزساختار کامپوزیت سطحی بررسی شد. برای این هدف پودر TiC با اندازه ذرات 1 و 45 میکرومتر به صورت لایه‌هایی با ضخامت‌های مختلف بر روی سطح فولاد H13 پیش‌نشانده و سپس فرآیند آلیاژسازی با لیزر انجام شد. نتایج نشان داد که در اثر عملیات ذوب سطحی، یک ساختار متناوب سلولی/دندریتی از عمق به سطح حوضچه مذاب توسعه یافت و شبکه‌ای غنی تر از عناصر آلیاژی در مناطق مرزی سلول/دندریت‌ها تشکیل ‌شد. سرعت سرد شدن در شرایط آزمایش از مرتبه یک میلیون کلوین بر ثانیه تخمین زده شد. با آلیاژسازی سطحی، ذرات پودر اولیه TiC به صورت کامل (پودر 1 میکرومتر) یا جزئی (پودر 45 میکرومتر) در حوضچه مذاب حل شدند و در هنگام سرد شدن، کاربیدهای MC بر پایه کاربید تیتانیم از مذاب رسوب کردند. افزایش ضخامت لایه پیش‌نشانده موجب متنوع‌تر شدن مورفولوژی رسوب‌های کاربیدی شد. در غلظت‌های کمتر TiC در مذاب، اندازه کاربیدهای MC در نمونه آلیاژسازی شده با پودر 45 میکرومتر ظریف‌تر بود. با افزایش تعداد رسوب‌ها، ساختارهای سلولی/دندریتی فولاد زمینه به دانه‌های هم محور و شبکه پیوسته مرز سلول/دندریت‌ها نیز به شبکه‌ای ناپیوسته در مرزدانه‌ها تبدیل شد.

چکیده انگلیسی:

In this research, the microstructure of the pulsed laser surface melted AISI H13 tool steel was studied. Then, by laser surface alloying with TiC powder, the effect of particle size and powder concentration on superficial composite microstructure was investigated. For this purpose, TiC powders with particle sizes of 1 micrometer and 45 micrometers in layers of different thicknesses were pre-placed on the surface of H13 steel and then subjected to pulsed laser operation. The results showed that in the surface melting, an intermittent cell/dendritic structure developed from the depth to the surface of the molten pool with a higher concentration of alloying elements in the boundary network. With the selected laser parameters, the cooling rate was estimated at one million K/s. In the surface alloying process, the preplaced TiC particles were completely (fine powders) or a partially (coarse powders) dissolved in the melt pool. During subsequent cooling, TiC-type MC carbides precipitated from the melt. Increasing the thickness of the preplaced layer caused the morphology of carbides to be more diverse. The size of precipitated MC carbides was reduced by decreasing the concentration of TiC powder in the melt pool and increasing the particle size of preplaced TiC powder. As the number of MC carbides increased, the cellular/dendritic structures of the steel matrix replaced by coaxial grains.

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