آلیاژسازی سطحی Ti-6Al-4V با نیتروژن و کروم به‌وسیله فرایند قوس تنگستن به‌منظور بهبود خواص تریبولوژیکی

نویسندگان

1 1- گروه مواد، دانشکده مهندسی مکانیک، دانشگاه پدافند هوایی خاتم‌الانبیاء (ص)، تهران، ایران

2 2- مرکز تحقیقاتی توکسین، دانشگاه علوم پزشکی آجا، تهران، ایران

چکیده

آلیاژ Ti-6Al-4V به‌دلیل خواص ویژه‌ای از جمله چگالی کم، استحکام و مقاومت به‌خوردگی بالا کاربردهای فراوانی در صنایع مختلف به‌ویژه هوافضا پیدا کرده است. با این‌حال، یکی از مشکلات عمده استفاده از این آلیاژ، خواص تریبولوژیکی ضعیف آن تحت بارهای نسبتاً زیاد است. در پژوهش حاضر، به‌منظور بهبود خواص تریبولوژیکی آلیاژ (Ti-6Al-4V)، از اضافه کردن ذرات کروم به ورق در محیط حاوی نیتروژن در فرایند جوشکاری قوس تنگستن (TIG) استفاده شد. بررسی‌های ریزساختاری به‌کمک میکروسکوپ نوری، آنالیز پراش پرتوی ایکس و میکروسکوپ الکترونی روبشی، تشکیل ذرات TiN، TiCr2 و Cr2N در زمینه‌ای از فاز سخت تیتانیم را تأیید کرد. سختی لایه آلیاژی شده با TIG به HV0.3 1000 افزایش یافت که چهار برابر بیشتر از سختی آلیاژ پایه بود. همچنین، نرخ سایش نمونه‌های آلیاژسازی شده با کروم و نیتروژن تحت بار 30 نیوتن و مسافت 1000 متر، 9/5 برابر نسبت به نمونه آلیاژ بدون پوشش، کاهش یافت.

کلیدواژه‌ها

عنوان مقاله [English]

TIG Surface Alloying of Ti-6Al-4V with Nitrogen and Chromium for Improved Tribological Properties

نویسندگان [English]

  • G. R. Faghani 1
  • A. R. Khajeh-Amiri 2
1 1- Materials Department, Faculty of Mechanical Engineering, Khatam-Ol-Anbia (PBU) University, Tehran, Iran.
2 2- Toxin Research Institute, Aja University of Medical Science, Tehran, Iran.
چکیده [English]

Due to special properties such as low density, high strength and high corrosion resistance Ti-6Al-4V alloy has been used extensively in various industries, especially in the aerospace aspects. However the major problem of this alloy is its poor tribological properties under relatively high loads. In the present study, in order to improve the tribological properties of mentioned alloy, chromium particles were added to Ti-6Al-4V layers in the nitrogen-containing atmosphere during the Tungsten Inert Gas (TIG) welding process. Microstructural investigations using optical microscopy, X-ray diffraction analysis and scanning electron microscopy, proved the formation of TiN, TiCr2 and Cr2N particles in the matrix of hard titanium phase. The hardness of TIG alloyed layer increased to 1000 HV0.3 which was 4 times higher than that of the base alloy. Moreover, the wear rate of TIG alloyed samples with chromium and nitrogen under 30N load and distance of 1000 m was 5.9 times lower than that of the bare Ti-6Al-4V alloy.

کلیدواژه‌ها [English]

  • Hardness
  • Wear
  • Ti-6Al-4V alloy
  • TIG process
  • microstructure

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مواد پیشرفته در مهندسی
دوره 38، شماره 4
بهمن 1398
صفحه 65-74

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