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

نوع مقاله : علمی و پژوهشی

نویسندگان

• حمید سازگاران ¹
• میلاد حجتی ²
• محمدرضا اکبری ¹

¹ دانشگاه مهندسی فناوریهای نوین قوچان

² فردوسی مشهد

10.22067/ma.v31i1.64093

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

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عنوان مقاله [English]

Comparison on Porosity Percent, Microstructure and Compression Behavior of Steel Foams Containing 2 wt. % Cu and 2 wt. % P

نویسندگان [English]

• Hamid Sazegaran ¹
• Milad Hojati ²
• mohamad reza Akbari ¹

¹ Quchan University of Advanced Technology

² ferdowsi

چکیده [English]

In this work, the effects of addition of 2 wt. % Cu and 2 wt. % P on the porosity percent, microstructure, and mechanical properties of 0.5 wt. % C steel foams manufactured by powder metallurgy through urea granulates as space holder were separately investigated. After manufacturing steel foams, determination of porosity percent by dimensional measurement, microstructural evaluation through optical and scanning electron microscopes, and investigation of mechanical behavior by compression test were conducted. The average of porosity percent in steel foams with Cu and P are 75 and 80 percent, respectively. In microscopic evaluations, two types of cells were observed that consisted of the solved urea cells and pores in the cells walls. In addition, the thickness of the cells walls was approximately measured from 90 to 102 micron. In the compressive stress vs. strain curves of Cu and P added steel foams, a long plateau region was observed. It is noteworthy that plateau region in the P added steel foams was as teeth-saw shape that related to the fracture of cells walls.

کلیدواژه‌ها [English]

• Steel foam
• additional Cu
• additional P
• Porosity percent
• Plateau region

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