Oxidation and exhaust gas corrosion resistance of the cobalt base clad layers

• Autorzy: Smolenska H.
• Języki publikacji: PL

Abstrakty

EN

Purpose: Purpose of this work is describing the behaviour of the cobalt base cladding layers after treatment in hot air (750° C, 200 hours) and exhaust gases (700° C, two month). Design/methodology/approach: The layers were produced by two cladding, laser and PTA, cladding technique. Cladding was conducted with a high power diode laser HDPL ROFIN SINAR DL 020 and Plasma Transformed Arc method. The layers consisted of three multitracking sublayers. The cobalt base layers were evaluated by microstructure investigations (optical and scanning electron microscope SEM), chemical analysis and micro hardness measurements. Findings: The microstructure of the investigated layers did not change much, neither on the top part nor in the clad/steel interface after treatment in both environments. On the outer surfaces the oxide layers were observed which consisted generally of chromium and iron oxides. The compositions of this scales were reviled by the EDS analyze. The changes in chemical compositions before and after oxidation and after corrosion in exhaust gases in the dendritic regions and micro regions were confirmed by the semi-quantitative chemical analysis (EDS). Neither the oxidation nor exposition for two month in exhaust gases did not influence on the morphology of the clad layers in any region however changes in chemical composition were observed. For both sort of clads the oxide layers were observed on the surface. The proposed layers are resistant for the hot exhausted gases. Research limitations/implications: The future researches should be done on microstructural and kinetic analyze of high temperature corrosion for higher temperature and times of the process. Practical implications: The clad layers, of this composition, were designed as a method to prolong service time for the ship engine exhausted valve and after this investigation the first valve heads with laser clad layer were installed in working ship engine. Originality/value: The chemical composition of the powder was new one. Also using the laser cladding technique for ship engine parts subject of interesting.

Słowa kluczowe

EN

gas corrosion; oxidation resistance; cobalt base alloy

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 31, nr 2
• Strony: 364--372
• Opis fizyczny: Bibliogr. 25 poz., wykr.

Twórcy

autor

Smolenska H.

• Mechanical Department, Gdansk University of Technology, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland,

Bibliografia

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