تاثیر تحولات ریزساختاری بر خواص خوردگی فولاد زنگ نزن آستنیتی s310 پس از عملیات ترمومکانیکی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
رضا بلوک حیدری
1
(دانش‌آموخته کارشناسی ارشد رشته مهندسی مواد، گرایش شناسایی و انتخاب مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.)
مصطفی اسکندری
2
(استادیار، عضو هیئت علمی رشته مهندسی مواد، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.)
مهدی یگانه
3
(استادیار، عضو هیئت علمی رشته مهندسی مواد، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.)
کلید واژه: ریزساختار, خوردگی, فولاد زنگ نزن آستنیتی s310, عملیات ترمومکانیکی,
چکیده مقاله :
چکیده
مقدمه: در این پژوهش تحولات ریزساختاری و تاثیر آن بر خواص خوردگی فولاد زنگ نزن آستنیتی s310 طی عملیات ترمومکانیکی بررسی شد.
روش: فرایند نورد سرد به میزان 90 درصد کاهش در ضخامت انجام پذیرفت. سپس نمونه‌ها در دماهای 750، 850، 950 و 1050 درجه سانتی‌گراد به مدت 10 دقیقه آنیل شدند. به کمک میکروسکوپ نوری ریزساختار نمونه‌ها مورد بررسی قرار گرفت. جهت بررسی خواص خوردگی نمونه‌ها از آزمون‌های طیف‌سنجی امپدانس الکتروشیمیایی و پلاریزاسیون پتانسیودینامیک در محلول سدیم کلرید 5/3 درصد وزنی استفاده گردید.
یافته‌ها و نتیجه‌گیری: نتایج نشان داد که فرایند نورد سرد موجب کاهش اندازه دانه و تبدیل فاز آستنیت به مارتنزیت αʹ ناشی از کرنش می‌شود. در ادامه در اثر عملیات آنیل استحاله برگشتی مارتنزیت αʹ به آستنیت اتفاق می‌افتد. افزایش دمای آنیل نیز موجب رشد دانه و افزایش متوسط اندازه دانه می‌شود. کاهش اندازه دانه در اثر فرایند نورد سرد موجب افزایش مقاومت به خوردگی می‌شود. همچنین مقاومت به خوردگی در اثر آنیل نمونه در دمای 750 درجه سانتی‌گراد افزایش پیدا کرده و مقدار آن نسبت به نمونه بدون آنیل از 26800 به Ω.cm2 38950 می‌رسد. انجام استحاله برگشتی از عوامل اصلی این افزایش در مقاومت به خوردگی می‌باشد. درحالی که افزایش دمای آنیل رشد دانه و کاهش تدریجی مقاومت به خوردگی را به دنبال دارد. به گونه‌ای که مقدار مقاومت به خوردگی در نمونه آنیل شده در دمای 1050 درجه سانتی‌گراد به Ω.cm2 5400 کاهش می-یابد.
ABSTRACT
Introduction: In this study, microstructural changes and their effect on corrosion properties of 310s austenitic stainless steel during thermomechanical treatment were investigated.
Methods: The cold rolling process was performed with a 90% reduction in thickness. The samples were then annealed at 750, 850, 950, and 1050 °C for 10 minutes. The microstructure of the samples was examined by an optical microscope. Electrochemical impedance spectroscopy and potentiodynamic polarization tests were performed in 3.5 wt. % NaCl to investigate the corrosion properties of the samples.
Findings and Conclusion: The results showed that the cold rolling process reduces the grain size and converts the austenite phase to strain-induced αʹ-martensite. Subsequently, a reverse transformation of αʹ-martensite to austenite occurs due to the annealing. Increasing the annealing temperature also causes grain growth and an increase in the average grain size. Corrosion resistance improved by reduction in grain size. Annealing at 750 °C also increased the corrosion resistance from 26800 to 38950 Ω.cm2 compared to the un-annealed sample. Reverse transformation is one of the main factors in this increase in corrosion resistance. While increasing the annealing temperature leads to grain growth and a decrease in corrosion resistance. So that the amount of corrosion resistance in the annealed sample at 1050 °C is reduced to 5400 Ω.cm2.
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