روش ساده و موثر ایجاد فاز بتا با فرآیند ذوب لیزری انتخابی آلیاژ مخلوط پودریMo10Ti-؛ رویکرد خوردگی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوینآرزو پورشجاع 1 , کریم آواک 2 , مازیار آزادبه 3 , محمدرضا اطمینان فر 4 , مهدی اجاقی 5
1 - دانشجوی دانشگاه صنعتی سهند
2 - دانشجوی کارشناسی ارشد، دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران
3 - استاد، دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران
4 - دانشیار، دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران
5 - دانشیار، دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران
کلید واژه: Ti-10Mo, Ti خالص, ذوب لیزری انتخابی, خوردگی, فاز بتا,
چکیده مقاله :
مقدمه: تیتانیوم و آلیاژهای آن به طور گستردهای در صنایع مختلف مورد استفاده قرار گرفتهاند. در این میان آلیاژهای تیتانیوم حاوی فاز β به مراتب از مقاومت به خوردگی بهتری برخوردارند. برخی از عناصر آلیاژی نظیر مولیبدن پایدار کنندهی این فاز میباشند. در میان آلیاژهای تیتانیوم حاوی این عنصر، آلیاژ Mo10 Ti- از اهمیت ویژهای برخوردار است. در صورتیکه به توان با به کارگیری روشهای نوین نظیر ساخت افزایشی و به ویژه با استفاده از مواد قابل دسترس مانند مخلوط پودری، این آلیاژ را تهیه نمود میتوان آن را به عنوان روشی فراگیر معرفی کرد.
روش: نمونههای Mo10 Ti- و Ti خالص به روش ذوب لیزری انتخابی چاپ شد. فازهای تشکیل دهنده، ریزساختار و رفتار خوردگی به ترتیب با استفاده از دستگاه پراش پرتو ایکس، میکروسکوپ نوری و الکترونی روبشی، آزمونهای پلاریزاسیون پتانسیودینامیک چرخهای و طیفسنجی امپدانس الکتروشیمیایی ارزیابی شد.
یافته ها: در الگوی پراش پرتو ایکس تیتانیم خالص پودری و نمونه ی پرینت شده به ترتیب فازهای α و ′ α/αدیده می شود. ولی در مورد Mo10 Ti-مخلوط پودری حاوی فاز α و پیکهای مولیبدن است که پس از چاپ، با نفوذ مولیبدن در تیتانیوم، فاز β ظاهر میشود. هم چنین در بررسی ریزساختاری آلیاژ Mo10Ti-، فاز بتا به صورت رگههای مولیبدن داخل حوضچههای مذاب تیتانیوم دیده میشود، در حالی که در تیتانیوم خالص فاز بتا به صورت دانههای ستونی β در داخل آنها فاز مارتنزیت رشد کرده دیده می شود. بررسی های پلاریزاسیون نیز نشان داد که با افزودن مولیبدن به تیتانیوم خالص، چگالی جریان غیر فعال کاهش مییابد. اما لایه اکسید غیرفعال Mo10 Ti-در پتانسیلهای بالا دچار پارگی شده و باعث خوردگی حفرهای میشود. امپدانس Mo10 Ti-بیشتر از تیتانیوم خالص است و هر دو نمونه دارای لایه اکسید غیر فعال دوگانه هستند که مقاومت لایههای اکسید آلیاژ Mo10Ti- بیشتر از مقاومت لایههای اکسید تیتانیوم خالص است.
نتیجه گیری: افزودن مولیبدن به تیتانیوم خالص، چگالی جریان غیرفعال را کاهش و پایداری فیلم اکسید را در آلیاژ Ti-10Mo افزایش میدهد. در شرایط پتانسیل حفاظتی، این آلیاژ مقاومت به خوردگی بالاتری نسبت به تیتانیوم خالص نشان میدهد. روش ذوب لیزری انتخابی مخلوط پودری Mo10 Ti-در نوبه خود برای ایجاد فاز β و بهبود مقاومت به خوردگی روش موثری بوده است.
Introduction: Titanium alloys containing the β phase have much better corrosion resistance. Some alloying elements, such as Mo, stabilize this phase. Among the Ti alloys that contain this element, the Ti-10Mo alloy is of particular importance. If this alloy is produced using selective laser melting (SLM), it will be an approach that is user-friendly due to the nature of the process.
Methods: Samples were printed by SLM process. The constituent phases were determined by XRD. The microstructure was evaluated using optical and scanning electron microscopes. Corrosion behavior was evaluated by cyclic potentiodynamic polarization and electrochemical impedance spectroscopy.
Findings: In the XRD pattern of pure Ti powder and printed sample, α and α/α' phases are seen, respectively. However, Ti-10Mo powder mixture consists of α and Mo phases, the β phase is more dominant in printed sample because of the Mo penetration in the Ti matrix. As well as, in the microstructure of Ti10Mo the beta phase is seen as Mo-rich streaks, whereas in pure Ti it is found relatively negligible as epitaxially grown primary columnar β grains with acicular α' martensite phase. Mo addition to pure Ti reduces its passive current density and stabilize oxide film. However, Ti-10Mo alloy, with its various phases and galvanic couples, experiences rupture of the passive oxide film at higher potentials, leading to pitting corrosion. The impedance module value of Ti-10Mo is higher than that of pure Ti. Both samples have a double passive oxide film, with Ti-10Mo alloy exhibiting higher resistance than pure Ti.
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