تأثیر سیلیسیم بر ریزساختار و مقاومت به سایش چدن خاکستری آلومینیم دار

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیأت علمی/ دانشگاه شهید رجایی

2 دانش آموخته دانشگاه آزاد اسلامی- واحد خمینی شهر

چکیده

چدن خاکستری جزو معمولترین و مهمترین مواد مهندسی هستند که نقش قابل توجه و کاربردهای فراوانی در صنایع مختلف، از جمله خودروسازی و ساخت ماشین آلات دارند و هنوز هم مورد توجه محققین به منظور بهبود خواص و حفظ جایگاه این فلز در میان مواد مهندسی می باشد. در این تحقیق، ریزساختار چدن خاکستری غیر آلیاژی و همچنین چدن های خاکستری محتوی 4% وزنی آلومینیوم با مقدار متغیر 1 تا 4% وزنی سیلیسیم مورد بررسی قرار گرفته و مقاومت به سایش آنها به روش پین بر روی دیسک ارزیابی شد. نتایج نشان داد که افزودن آلومینیوم به چدن خاکستری باعث تشکیل فاز فریت می گردد که کاهش سختی را به دنبال دارد. همچنین افزودن سیلیسیم تا 2% وزنی به چدن خاکستری آلومینیم دار، موجب تشدید در تشکیل فاز فریت شده و افزودن بیش از 2% وزنی، موجب تشکیل ترکیب بین فلزی Fe-Al-Si می شود. در چدن خاکستری محتوی 3% و 4% وزنی سیلیسیم، با ثابت بودن درصد آلومینیوم در 4% وزنی، به دلیل افزایش درصد فاز بین فلزی، سختی نیز افزایش می آید. نتایج حاصل از آزمون سایش با تأیید نتایج ریزساختار و سختی، مؤید نرخ سایش کمتر در چدن های محتوی فاز بین فلزی بودند. در مقابل کمترین مقاومت سایشی در چدن آلومینیم دار محتوی 2% سیلیسیم دیده شد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of silicon on microstructure and wear resistance of aluminum bearing gray cast iron

نویسندگان [English]

  • Hassan Jafari 1
  • Ehsan Sanatizadeh 2
1 Faculty member/Shahid Rajaee University
چکیده [English]

Gray cast iron is among the most common and important engineering material that plays a significant role and has many applications in various industries, including the automotive and machinery manufacturing. It still attracts researchers’ interest to improve its properties and maintain its position among the engineering materials. In this research, the microstructure of plain cast iron as well as those containing 4 wt% aluminum with different amounts of silicon, 1 to 4 wt%, was studied. Pin-on-disc method was used to evaluate the wear resistance of the cast irons. The results showed that the addition of aluminum to gray cast iron brings about the formation of ferrite phase, which accompanies a decrease in hardness value. In addition, the increase in silicon content in aluminum bearing cast iron up to 2wt% intensifies the formation of ferrite phase, while the further increase to 3 wt% results in emerging a Fe-Al-Si intermetallic compound. In gray cast iron with constant 4 wt% aluminum, increasing silicon content to 3 wt% and 4 wt% leads to improve the hardness value due to the increased percentage of intermetallic phase. Confirming microstructure evolution as well as hardness values, the results of wear experiment approved lower wear rate in cast irons containing intermetallic phase. In contrast, the lowest wear resistance was observed in aluminum bearing cast iron containing 2 wt% silicon.

کلیدواژه‌ها [English]

  • Gray cast iron
  • Aluminum
  • Silicon
  • Microstructure
  • Wear

 

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