نشریه علوم و مهندسی سطح

نشریه علوم و مهندسی سطح

روکش‌کاری لیزری آلیاژ Ni-Mo-Al بر روی زیرلایه‌ی فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی و علم مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.
2 دانشگاه صنعتی مالک اشتر، مجتمع دانشگاهی مواد و فناوری‌های ساخت، تهران، ایران.
چکیده
در این پژوهش روکش آلیاژی سه جزئی Ni-Mo-Al بر روی سطح فولاد ساده کربنی ایجاد شد. تاثیر توان لیزر و سرعت حرکت لیزر بر ریزساختار روکشهای به دست آمده مورد ارزیابی قرار گرفت. ریزساختار و ترکیب شیمیایی روکش به دست آمده در شرایط مختلف بکمک میکروسکوپ نوری، میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM) و اشعه ایکس پاشنده انرژی متصل به آن (EDS) مورد ارزیابی قرار گرفت. بررسی تصاویر ریز ساختار مقطع روکش نشان داد؛ روکش دارای ریزساختار ناحیه انتقالی، مرز نوع II، دندریت ستونی و دندریت هم محور می‌باشد. ارزیابی‌های شیمیایی عنصری پوشش نشان داد ترکیبات بین فلزی حاوی نیکل، مولیبدن و آهن تشکیل شده است که موجب بهبود ریز ساختار و دانه ریز شدن می‌شود. با افزایش سرعت روبش به دلیل حرارت ورودی کمتر جوانه زنی بیشتر رخ داده و مقدار دندریت‌ها بیشتر و ابعاد آنها ریزتر می‌شود. همچنین با افزایش سرعت روبش، رقت نیز افزایش پیدا می کند.
کلیدواژه‌ها

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