اثر میزان کاربید تنگستن بر درصد تخلخل، ریزساختار و رفتار مکانیکی فوم فولادی تولید شده به روش متالورژی پودر با استفاده از فضاساز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی صنایع، دانشکده مهندسی، دانشگاه صنعتی قوچان، قوچان، ایران.

2 فارغ‌التحصیل کارشناسی مهندسی صنایع، دانشکده مهندسی، دانشگاه صنعتی قوچان، قوچان، ایران.

3 مدیر بخش تحقیق و توسعه شرکت متالورژی پودر مشهد، مشهد، ایران.

چکیده

در پژوهش حاضر، فوم‌های فولادی به روش متالورژی پودر و با استفاده از دانه‌های اوره به عنوان فضاساز به صورت موفقیت‌آمیز تولید شدند و اثر افزودن کاربید تنگستن (0، 5/0، 1، 2 و 4 درصد وزنی) به فولاد سازنده دیواره سلول‌ها بر روی میزان تخلخل، ریزساختار دیواره سلول‌ها و ویژگی‌های مکانیکی فوم‌های تولیدی مطالعه شد. ریزساختار دیواره سلول‌ها توسط میکروسکوپ نوری و میکروسکوپ الکترونی روبشی مجهز به نرم‌افزار پردازش تصویر ارزیابی گردید. افزایش درصد وزنی کاربید تنگستن تاثیر اندکی بر روی کسر سطحی و میزان کرویت سلول‌ها دارد و این در حالی است که کسر سطحی و میزان کرویت حفرات تشکیل شده در دیواره سلول‌ها شدیداً تحت تاثیر افزودن کاربید تنگستن است. رفتار مکانیکی فوم‌های فولادی تولید شده توسط انجام آزمون فشار تعیین شدند. درصد تخلخل فوم‌های تولیدی بین 73 تا 80 درصد است و با افزایش میزان کاربید تنگستن، درصد تخلخل کاهش می‌یابد. نتایج ارزیابی‌های میکروسکوپی حاکی از آن است که ریزساختار دیواره سلول‌ها شامل فریت و پرلیت است که ذرات کاربید تنگستن به صورت یکنواخت درون آن توزیع یافته‌اند. منحنی تنش- کرنش فوم‌های فولادی دارای ناحیه الاستیک، ناحیه پلاتو طولانی دندانه اره‌ای و نقطه شکست است و با افزایش درصد وزنی کاربید تنگستن، منحنی‌ها به سمت بالا شیفت می‌یابند.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of WC content on porosity percentage, microstructure, and mechanical behavior of steel foam manufactured through powder metallurgy using space holder technique

نویسندگان [English]

  • Hamid Sazegaran 1
  • Zahra Vali Pour 2
  • Farhad Khoram Shahi 3
1 Assistant Professor, Department of Industrial Engineering, Engineering Faculty, Quchan University of Technology, Quchan, Iran.
2 B.Sc., Department of Industrial Engineering, Engineering Faculty, Quchan University of Technology, Quchan, Iran.
3 M.Sc., Research and Development Manager of Mashhad Powder Metallurgy Company, Mashhad, Iran.
چکیده [English]

In this present work, steel foams were successfully manufactured through powder metallurgy route using urea granules as space holder and influences of WC content (0, 0.5, 1, 2, and 4 wt. %) added into cell walls were studied on porosity percentage, microstructure of cell walls, and mechanical properties of steel foams. The microstructure of cell walls was evaluated using optical microscope and scanning electron microscope equipped with image processing software. Increasing WC has little effect on surface fraction and sphericity of cell, while the surface fraction and sphericity of the pores formed into the cell walls are strongly affected by the addition of WC. The mechanical behavior of the steel foams was conducted using compression test. The porosity of the steel foams is between 73 % and 80 % and with the increase in WC content, the porosity percentage decreases. The results of microscopic evaluations indicated that the microstructure of cell walls contains ferrite and pearlite, with tungsten carbide particles distributed uniformly. The stress vs. strain curves of the steel foam have an elastic region, a long saw-tooth plateau region, and a fracture point and the curves are shifted upward as the WC content increased.

کلیدواژه‌ها [English]

  • Steel foam
  • WC
  • Space holder technique
  • Microstructure of cell wall
  • Compressive behavior

مراجع

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  • تاریخ دریافت: 06 بهمن 1398
  • تاریخ بازنگری: 27 مهر 1399
  • تاریخ پذیرش: 25 آذر 1399

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