تحولات ریزساختاری در طی جوشکاری اصطکاکی اغتشاشی فولاد زنگ نزن آستنیتی 316 AISI به فولاد کم کربن 37St

نوع مقاله : علمی و پژوهشی

نویسندگان

دانشگاه صنعتی اصفهان

چکیده

در این مقاله به بررسی تحولات ریزساختاری اتصال غیرمشابه فولاد زنگ نزن آستنیتی 316AISI به فولاد کم کربن 37St جوشکاری شده با روش جوشکاری اصطکاکی اغتشاشی پرداخته شده است. جوشکاری اصطکاکی اغتشاشی با سرعت چرخشی 600 دور بر دقیقه و سرعت خطی 50 میلی-متر بر دقیقه انجام شد. بررسی های فازی توسط آزمون پراش اشعه ایکس و آزمون طیف سنجی اشعه ایکس و بررسی های ریزساختاری توسط میکروسکوپ نوری و میکروسکوپ الکترونی روبشی انجام شد. نتایج بررسی های فازی در مرز اتصال شواهدی از تشکیل کاربید و ترکیبات بین فلزی را نشان نداد. بررسی های ریزساختاری نیز نشان داد که بیشترین میزان کاهش اندازه دانه ها، در ناحیه اغتشاشی سمت فولاد زنگ نزن آستنیتی رخ می دهد که دلیل آن تبلور مجدد دینامیکی ناپیوسته ناشی از تغییر شکل شدید همراه با دمای بالا در این ناحیه می باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Microstructural Evolution during Friction Stir Welding of Austenitic Stainless Steel AISI 316 to Low Carbon Steel St 37

نویسندگان [English]

  • Amirhossein khosrovaninezhad
  • morteza shamanian
  • ahmad rezaeian
  • masoud atapour
Isfahan University of Technology
چکیده [English]

The microstructural evolution of dissimilar joining of austenitic stainless steel AISI 316 and low carbon steel St37 by friction stir welding has been investigated. Friction stir welding was carried out using a rotational speed of 600 rpm and a linear speed of 50 mm/min. The microstructure was characterized using a scanning electron microscope and optical microscopy. Also, possible phase transformations were determined using X-ray diffraction technique & electron diffraction spectroscopy. The results of phase investigations showed that no carbides and brittle phases were detected at the joined boundary. Microstructural investigations showed that the highest decrease in grain size occurred in the stir zone of the austenitic stainless steel which was attributed to discontinuous dynamic recrystallization caused by severe deformation imposed at high temperatures in this region.

کلیدواژه‌ها [English]

  • Friction Stir Welding
  • Dissimilar joint
  • Austenitic stainless steel
  • Low Carbon Steel
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