The Effect Of The Holding Time On The Formation Of Niobium-Vanadium Carbide Coating Onto AISI 420 By Thermo-Reactive Diffusion Process

Haekal, Husen (2020) The Effect Of The Holding Time On The Formation Of Niobium-Vanadium Carbide Coating Onto AISI 420 By Thermo-Reactive Diffusion Process. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

The deep drawing process had been widely used in automobile, aerospace, electronics, and allied industries to produce hollow parts. The quality of the deep drawing is determined by the dies properties especially their wear-resistant and hardness. Austenitic stainless steel AISI 420 is one of the material of choice for making these dies. In order to increase the wear resistance of the dies, surface treatment such as thermo-reactive diffusion (TRD) technique can be applied owing to their simplicity, low cost, and environment friendly process. TRD technique able to deposit hard layers of carbide, nitride, or carbonitride In this research, TRD techniques was employed to AISI 420 with special attention given to the effect of holding time during TRD process to form niobium-vanadium carbide (NbVC) coating. The TRD process is carried out by the powder-pack method in a sealed steel container containing powder mixture of niobium and vanadium as master alloy, alumina (Al2O3) as an inert filler and ammonium chloride (NH4Cl) as an activator. The samples were covered with powder mixture and then heated in the electric resistance furnace for 2, 4, and 6 hours at 1000˚C. The crosssection analysis of the NbVC coating observed under microscopy shows that coating thickness increased with longer holding time with 6.95 µm measured in 6 hours holding time. The high hardness of 1333.2 HV also found in the longest holding time of 6 hours. This high hardness is expected to contribute in the wear resistance characterisitic of AISI 420 dies. ========================================================= =========================================================The Deep Drawing process telah banyak digunakan di mobil, dirgantara, elektronik, dan industri terkait untuk menghasilkan bagian berlubang. Kualitas gambar dalam ditentukan oleh sifat cetakan terutama tahan aus dan kekerasannya. Baja tahan karat Austenitik AISI 420 merupakan salah satu material pilihan untuk membuat cetakan ini. Untuk meningkatkan ketahanan aus pada cetakan, perawatan permukaan seperti teknik Thermo-Reactive Diffusion (TRD) dapat diterapkan karena kesederhanaan, biaya rendah, dan proses yang ramah lingkungan. Teknik TRD mampu mengendapkan lapisan keras karbida, nitrida, atau karbonitrida Dalam penelitian ini, teknik TRD akan digunakan pada AISI 420 dengan perhatian khusus pada pengaruh waktu penahanan selama proses TRD untuk membentuk lapisan niobium-vanadium karbida (NbVC). Proses TRD dilakukan dengan metode powder-pack dalam wadah baja tertutup yang berisi campuran serbuk niobium dan vanadium sebagai master alloy, alumina (Al2O3) sebagai pengisi inert dan amonium klorida (NH4Cl) sebagai aktivator. Sampel ditutup dengan campuran serbuk kemudian dipanaskan dalam tungku tahan listrik selama 2, 4, dan 6 jam pada suhu 1000˚C. Analisis penampang lapisan NbVC yang diamati dengan mikroskop menunjukkan bahwa ketebalan lapisan meningkat dengan waktu tahan yang lebih lama dengan 6,95 µm yang diukur dalam waktu tahan 6 jam. Kekerasan yang tertinggi 1333.2 HV juga ditemukan pada holding time paling lama yaitu 6 jam. Kekerasan yang tinggi ini diharapkan berkontribusi pada karakterisitik ketahanan aus pada dies AISI 420.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Deep drawing process, thermo-reactive diffusion, niobium-vanadium carbide, AISI 420, hardness Deep Drawing Process, difusi termo-reaktif, niobium-vanadium karbida, AISI 420, kekerasan
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA491 Metal coating.
T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Husen Haekal
Date Deposited: 26 Aug 2020 13:45
Last Modified: 26 Aug 2020 13:45
URI: http://repository.its.ac.id/id/eprint/81393

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