کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8044160 1518915 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and mechanical property of Ni-based thick coating remelted by gas tungsten arc
ترجمه فارسی عنوان
ریزساختار و ویژگی های مکانیکی پوشش ضخیم بر پایه نیکل که توسط قوس تنگستن گاز جایگزین شده است
کلمات کلیدی
گاز تنگستن قوس، پوشش ضخیم بر پایه نیکل، ریز ساختار، پیوند متالورژیکی، خاصیت مکانیکی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
چکیده انگلیسی
Herein a NiCrBSi coating with 800 μm thickness was fabricated via plasma spraying on AISI 1045 steel, whereupon gas tungsten arc welding (GTA) process was employed to remelt the coating. The microstructure and mechanical properties of the coating before and after remelting were investigated. The results indicate that microstructural inhomogeneity in the as-sprayed coating were almost completely eliminated by GTA remelting. The main phases in the as-sprayed coating are γ-Ni, Cr7C3 and Cr2B. While, the remelted coating is mainly composed of fine dendrite γ-(Ni,Fe,Cr) and thin interdendritic lamellar eutectic (Fe,Cr)23C6. Moreover, there are some submicron particles Ni3B, CrB and Ni3Si in the grain interior of γ-(Ni,Fe,Cr), and a large number of nanocrystallines in the grain boundary of γ-(Ni,Fe,Cr). After remelting, a compact and complete solid solution γ-(Ni,Fe,Cr) is formed at the interface between the remelted coating and substrate, hence the interface is transformed from mechanical bonding to metallurgical bonding. In addition, remelting the coating was found to induce a 84.4% increase in the elastic modulus, a 18.5 times increase in the fracture toughness, and a 42.8% increase in the microhardness. Therefore, GTA remelting is found a feasible method to significantly improve the microstructure and mechanical properties of the coating.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 155, September 2018, Pages 260-269
نویسندگان
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