تأثیر نیتروژن بر ریزساختار و خواص مکانیکی و خوردگی فولادهای زنگ نزن آستنیتی بدون نیکل

نوع مقاله : علمی و پژوهشی

نویسندگان

1 علم و صنعت ایران

2 دانشگاه علم و صنعت ایران دانشکده مهندسی متالورژی و مواد

3 مرکز مواد فلزی، دانشگاه صنعتی مالک اشتر.

چکیده

مقادیر متفاوتی از نیتروژن به فولادهای زنگ نزن آستنیتی بدون نیکل پر منگنز به کمک فروآلیاژ نیتریدی اضافه شد. ریزساختار توسط میکروسکوپ نوری، خواص مکانیکی توسط سختی سنجی و کشش مورد ارزیابی قرار گرفت. همچنین خواص خوردگی توسط طیف‌سنجی امپدانس الکتروشیمیایی و پلاریزاسیون بررسی شد. نتایج نشان داد که فولاد پرنیتروژن و کم نیتروژن به ترتیب دارای ساختار آستنیتی و آستنیت + فریت است. افزایش نیتروژن باعث افزایش استحکام تسلیم و استحکام کشش نهایی و سختی می شود. علاوه بر این، افزایش نیتروژن باعث کاهش چگالی جریان و جابجایی پتانسیل خوردگی به مقادیر مثبت تر می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effects of Nitrogen on Microstructure, Mechanical Properties and Corrosion Behavior in Nickel-Free Austenitic Stainless Steels

نویسندگان [English]

  • Seyyed Mohsen Salehi 1
  • Shahram Kheirandish 2
  • Seyyed Mehdi Abbasi 3
1 University Science and Technology
2 Iran University Science and Technology
3 Malek Ashtar
چکیده [English]

Different amounts of nitrogen were added to nickel-free high manganese austenitic stainless steels with addition of a nitrided ferroalloy. The microstructure was evaluated by optical microscopy and the mechanical properties were determined by macro-hardness and tensile tests. The corrosion behavior was evaluated by electrochemical impedance spectroscopy and polarization. The results showed that the microstructure of high nitrogen and low nitrogen steels were austenite and ferrite and austenite, respectively. The hardness, yield strength and ultimate tensile strength of the steels increased with increasing nitrogen content. In addition, corrosion current densities decreased and corrosion potentials shifted to more positive values with increasing nitrogen content.

کلیدواژه‌ها [English]

  • Austenitic Stainless Steels
  • Nitrogen
  • Mechanical properties
  • corrosion

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