بررسی تشکیل پوشش‌های لایه‌ای- کامپوزیتی کاربید کروم و وانادیم روی فولادهای SKD11 و T10 به روش نفوذ واکنش‌‌ حرارتی (TRD)

نویسندگان

1 گروه مهندسی مواد و متالورژی، دانشکده مهندسی، دانشگاه فردوسی مشهد، ایران

2 دانشکده مهندسی و علم مواد، دانشگاه Tsinghua، پکن، چین

چکیده

پوشش‌های کاربیدی به‌علت خواص ضدسایشی بسیار خوب، برای افزایش طول عمر قالب‌های آهنگری گرم و سرد و به‌طور کلی ابزارآلاتی که در معرض نیروهای سایشی قرار دارند، استفاده می‌شوند. امروزه، فرآیندهای گوناگونی جهت تولید پوشش‌های کاربیدی به‌کار گرفته می‌شوند که یکی از آنها روش نفوذ واکنشی حرارتی (TRD) با استفاده از حمام نمک مذاب است. از جمله مزایای این روش نسبت به سایر روش‌های پوشش‌دهی، داشتن صرفه اقتصادی است. در این تحقیق، پوشش‌های کامپوزیتی کاربیدی روی فولادهای ابزار SKD-11 و T10 در دمای 1000 درجه سانتی‌گراد، با استفاده از حمام مخلوط اکسید کروم و اکسید وانادیم با نسبت مولی کروم به وانادیم برابر 0/66 و سپس حمام منفرد اکسید وانادیم تشکیل شد. نتایج آنالیز فازی نشان داد که پوشش‌ها حاوی فازهای کاربید کروم با ترکیب: CrC،Cr7C3 و Cr23C6 و همچنین فازهای کاربید وانادیم با ترکیب: VC،VC0.88،V6C5 و V8C7 و یک فاز سه‌تایی با ترکیب Cr2C2V هستند. نتایج نشان داد که بهترین میزان سختی (HV1980-2020) و کمترین مقدار ضریب اصطکاک (0/14) مربوط به پوشش کاربیدی ایجاد شده روی فولاد T10 در حمام دوم اکسید وانادیم است. 

کلیدواژه‌ها


عنوان مقاله [English]

INVESTIGATION OF CHROMIUM AND VANADIUM CARBIDE COATING FORMATION ON SKD11 AND T10 BY THERMO-REACTIVE DIFFUSION (TRD) METHOD

نویسندگان [English]

  • O. Ganji 1
  • S.A. Sajjadi 1
  • M. Mirjalili 1
  • Z.G. Yang 2
1 Department of Metallurgy and Materials Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 School of Materials Science and Engineering, Tsinghua University, Beijing, China
چکیده [English]

Carbide coatings, due to their excellent anti-wear properties, are used to extend the life of molds exposed to abrasion forces. Various processes have been applied to produce carbide coatings. Thermo-reaction diffusion (TRD) using a molten salt bath could be considered as an economical method compared to other coating processes. In this study carbide-composite coatings using molten salt baths composed of oxides of carbide forming elements (chromium and vanadium) on SKD-11 and T10 tool steels at 1000 ℃ were formed. The results showed that the coatings included chromium carbide phases: CrC, Cr7C3, and Cr23C6 as well as vanadium carbide: VC, VC0.88, V6C5, V8C7, and a triple phase with the composition of Cr2C2V. The highest hardness (1890-2020 HV) and the lowest coefficient of friction (0.14) were achieved by the carbide coating of T10 steel with the second bath of vanadium oxide.
 

کلیدواژه‌ها [English]

  • Thermo-reactive diffusion
  • Chromium and vanadium carbide coatings
  • Molten salt bath
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