مقایسۀ درصد تخلخل، ریزساختار و رفتار فشاریِ فومهای فولادی حاوی 2 درصد وزنی مس و 2 درصد وزنی فسفر

مهندسی متالورژی و مواد

مقاله 6، دوره 31، شماره 1 - شماره پیاپی 21، اسفند 1398، صفحه 63-76   

نوع مقاله: علمی و پژوهشی

شناسه دیجیتال (DOI): 10.22067/ma.v31i1.64093

نویسندگان

حمید سازگاران^{* 1}؛ میلاد حجتی²؛ محمدرضا اکبری¹

¹دانشگاه مهندسی فناوریهای نوین قوچان

²فردوسی مشهد

چکیده

در این پژوهش، اثر افزودن 2 درصد وزنی مس و 2 درصد وزنی فسفر به‌صورت مجزّا بر درصد تخلخل، ریزساختار و رفتار مکانیکی فوم‌های فولادی حاوی 5/0 درصد وزنی کربن تولیدشده به روش متالورژی پودر و با استفاده از دانه‌های اوره به‌عنوان پُرکنندۀ فضا مورد مطالعه قرار گرفت. پس از تولید فوم‌های فولادی، تعیین درصد تخلخل به روش اندازه‌گیری ابعادی، ارزیابی‌های ریزساختار توسّط مطالعات میکروسکوپ‌های نوری و الکترونی و بررسی رفتار مکانیکی توسّط انجام آزمون فشار صورت گرفت. میانگین درصد تخلخل در فوم‌های حاوی 2 درصد وزنی مس و 2 درصد وزنی فسفر به ترتیب برابر 75 و 80 درصد است. در ارزیابی‌های میکروسکوپی، دو دسته متفاوت از سلول‌ها مشاهده شد که شامل سلول‌های ایجاد شده در اثر انحلال دانه‌های اوره و حفرات ایجاد شده در دیواره‌های سلول‌ها هستند. علاوه بر این، ضخامت دیواره سلول‌ها بین 90 تا 102 میکرون اندازه‌گیری شد. در منحنی‌های تنش -کرنش فشاری فوم‌های حاوی مس و فسفر ناحیۀ پلاتو بسیار طولانی مشاهده شد. شایان یادآوری است که ناحیۀ پلاتو در فوم‌های حاوی فسفر به‌صورت دندانه‌ارّه‌ای است که به شکست دیوارۀ سلول‌ها ارتباط دارد.

کلیدواژه‌ها

فوم‌‌ فولادی؛ مس افزودنی؛ فسفر افزودنی؛ درصد تخلخل؛ ناحیه پلاتو

سایر فایل های مرتبط با مقاله

6- sazegaran - Revised.pdf

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