ارزیابی رفتار فشاری فوم‌های فولادی تولیدشده به‌روش متالورژی پودر

نوع مقاله : علمی و پژوهشی

نویسندگان

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

2 گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه صنعتی قوچان، قوچان.

3 مهندسی مکانیک، دانشکده مهندسی، دانشگاه صنعتی قوچان، قوچان.

چکیده

فوم‌های فلزی و فلزات سلولی دسته‌ای از مواد مهندسی نوظهور هستند که به‌دلیل داشتن رفتار و ویژگی‌های منحصربه‌فرد می‌توانند در بسیاری از کاربردهای صنعتی به‌صورت موفقیت‌آمیز استفاده شوند. در این پژوهش، فوم‌های فولادی به‌روش متالورژی پودر و با استفاده از اوره به‌عنوان پرکنندۀ فضا یا فضاساز تولید شدند و درصد تخلخل، ریزساختار و رفتار فشاری آن‌ها مطالعه شد. علاوه‌براین، رفتار فشاری فوم‌های تولیدی به کمک روش اجزای محدود و برپایه مدل گارسون-تورگارد-نیدلمن شبیه‌سازی و اثر پارامترهای مؤثر در مدل یادشده برای پیش‌بینی بهتر رفتار فوم‌های فولادی بررسی شد. نتایج حاکی از آن است که میانگین میزان تخلخل در فوم‌های فولادی برابر 3/79درصد است که شامل سلول‌های تشکیل‌شده در اثر انحلال دانه‌های اوره و حفرات باقی‌مانده در بین ذرات آهن تف‌جوشی‌شده است. منحنی‌های‌ تنش-کرنش فشاری فوم‌های فولادی تولیدشده بیانگر رفتار مرسوم فوم‌های فلزی است و دارای نواحی تغییر شکل کشسان و پلاتو دندانه اره‌ای نسبتاً طولانی و درنهایت، نقطه شکست است. نتایج شبیه‌سازی پیش‌بینی می‌کند که اندازۀ مش، fn، q1 و q2 بر روی منحنی‌های تنش-کرنش فشاری مؤثرند، اما q1 بیشترین تأثیر و fn کمترین تأثیر را دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation on the Compressive Behavior of Steel Foams Manufactured by Powder Metallurgy Route

نویسندگان [English]

  • Hamid Sazegaran 1
  • Ali Mohamad Naserian Nik 2
  • Mohamad Reza Akbari 3
  • Ali Akbari Nejad Fogh 3
1 Department of Industrial Engineering, Faculty of Engineering, Quchan University of Technology, Quchan, Iran.
2 Department of Industrial Engineering, Faculty of Engineering, Quchan University of Technology, Quchan, Iran.
3 Department of Industrial Engineering, Faculty of Engineering, Quchan University of Technology, Quchan, Iran.
چکیده [English]

Metallic foams and cellular metals are a type of new-advanced engineering materials which can be successfully used in various industrial applications due to their unique behavior and properties. In this work, steel foams were produced through powder metallurgy route using urea granules as a space holder, and porosity percentage, microstructure, and compressive behavior of them were investigated. In addition, the compressive behavior of manufactured foams was simulated using finite element method by the Gurson–Tvergaard–Needleman model and the effects of operational parameters in this model were investigated due to better prediction of mechanical behavior of steel foams. The results indicated that the average of porosity in the steel foam is 79.3 percent, which consists of cells formed by the dissolution of urea granules and remained pores between the sintered iron particles. Stress vs. strain curves of the manufactured steel foams showed the conventional behavior of metal foams, with elastic deformation region and a relatively longitudinal plateau region and, a fracture point, finally. Mesh sizes, fn, q1 and q2 have the significant effect on stress vs. strain curves, but q1 and fn have the most and the least effects, respectively.

کلیدواژه‌ها [English]

  • Steel foam
  • Compressional behavior
  • Gurson–Tvergaard–Needleman model
  • Saw-tooth plateau
  • Simulation parameter
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