اثر زمان و دمای غوطه وری بر مشخصات فصل مشترک آلومینیم خالص و فولاد ساده کربنی

نوع مقاله: مقاله کامل علمی پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران

2 دانشیار، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران‏

10.22034/frj.2018.108915.1014

چکیده

برای دستیابی به یک کامپوزیت جفت-فلزی قابل قبول از دو فلز، بررسی مشخصات فصل مشترک آنها ضروری به نظر می‌رسد. در این تحقیق اتصال بین یک نمونه فولاد ساده کربنی و آلومینیم خالص تجاری و نحوه‌ تشکیل و رشد ترکیبات بین‌فلزی در فصل مشترک مورد بررسی قرار گرفت.  میله‌های فولادی، در زمان‌های مختلف 5، 10، 15 و 20 دقیقه در دماهای 680، 720، 760 و 800  درجۀ سانتیگراد، درون مذاب آلومینیم خالص نگه‌داشته شده و سپس از مذاب بیرون آورده و در هوا خنک شدند. پس از نمونه‌گیری از مقاطع، ریزساختار فصل مشترک تشکیل شده بین زیرلایه‌ی فولادی و آلومینیم با میکروسکوپ نوری (OM)، میکروسکوپ الکترونی (SEM)، اسپکتروسکوپی اشعه ایکس (EDS) و ریزسختی سنجی ویکرز مورد بررسی قرار گرفت. نتایج نشان داد که لایه‌ی بین‌فلزی  از دوترکیب بین‌فلزی  FeAl3 و Fe2Al5 تشکیل شده است. با افزایش دما و زمان غوطه‌وری نوع ترکیبات تشکیل شده بدون تغییر بوده و فقط ضخامت لایه‌ی بین‌فلزی  تغییر کرده است. برای بررسی سختی فازهای تشکیل شده، تست ریزسختی سنجی ویکرز در راستای عمود بر فصل مشترک نشان داد که سختی فصل مشترک واکنشی ایجاد شده به دلیل وجود ترکیبات بین­فلزی سخت و ترد، بالاتر از سختی فلزات پایه فولاد و آلومینیم است. سینیتیک تشکیل ترکیبات مورد بحث قرار گرفته است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Immersion Time and Temperature on the Interface Characteristics ‎of Pure Aluminium and Plain Carbon Steel

نویسندگان [English]

  • H. Baradaran Mehrabadi 1
  • Mehdi Divandari 2
  • Hassan Saghafian Larijani 2
1 M.Sc. Student, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran‎
2 Associate Professor, ‎School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.‎
چکیده [English]

To reach an acceptable bimetallic composite product from two metals, interface characteristics needs to be investigated. In this work joining of commercial aluminium and a plain carbon steel and the formation and growth of intermetallic compounds at the interface was investigated. Steel rods were immersed into the pure aluminium melt at temperatures of 680, 720, 760 and 800 Celsius and kept for different times of 5, 10, 15 and 20 minutes, respectively and then were taken out and cooled in the air. After cross sectioning and sampling, the microstructure of interface between steel substrate and aluminium was studied by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Vickers hardness tests. The results showed that two intermetallic compounds, FeAl3 and Fe2Al5 are formed in the interface. Increasing the holding time and temperature changed the interface thickness and had no clear effects on the intermetallics types. Vickers hardness tests showed that the hardness of reaction interface was higher than aluminum and steel substrate due to presence of the above mentioned intermetallics. Kinetic of intermetallics formation are discussed.

کلیدواژه‌ها [English]

  • Bimetal composite
  • Interface of Steel/Aluminum
  • Immersion
  • ‎ Intermetallics

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