The Impact of Material Selection on Durability of Exhaust Valve Faces of a Ship Engine – A Case Study

• Autorzy: Smoleńska Hanna , Kończewicz Włodzimierz , Bazychowska Sylwia

Identyfikatory

DOI

10.12913/22998624/124074

• Języki publikacji: EN

Abstrakty

EN

Two alloys were used in order to extend the service life of marine engine exhaust valve head. Layers of cobalt base alloys were made of the powders with chemical composition as follow: the layer marked L12; C-1.55%; Si-1.21%; Cr-29.7%; W-9%; Ni-2%; Mo<0.01%; Fe-1.7%; Co-54.83% and the layer marked N; C-1.45%; Co-38.9%; Cr24.13%; Ni-10.43%; W-8.75%; Fe-7.64%; Mo-7.56%; Si-2.59%. Base metal was valve steel after heat treatment. It was consisted of: C-0,374%; Cr-9,34%; Mn-0.402%; Ni-0.344%; Si-2.46%; Mo-0.822%; P-0.0162%; S-0.001%. Layers on the valve faces were produced by laser cladding using the HPDL ROFIN DL020 laser. Grinding treatment is a very popular form of regeneration of seat and valve plug adhesions. Properly performed grinding operation ensures dimensional and shape accuracy of the surface from 7 to 5 accuracy class and surface roughness Ra not less than 0.16 μm, depending on the object and method of grinding. The 75H and 150S types are a significantly simplified form of valve plug face grinders. Finishing treatment was carried out with a Chris-Marine AB75H sander on a sanding stand equipped with a compressed air system - the stand was designed by the author. The sander has been set up to the surface of the valve stem so that the grinding angle of the valve faces is 30°+10°. A flat grinding wheel T1CRA54–K was used for machining. The plunge feed was 0.01 mm/rev. The thickness of the welded layer after grinding was 1.2 mm. Both valves were installed in the ship’s engine and were used in real life. After 2000 hours of operation, the valve marked N was damaged. The valve marked L12 showed no damage and was in operation for the next 1000 hours.

Słowa kluczowe

EN

cobalt alloy; laser cladding; exhaust valve

PL

stop kobaltu; napawanie laserowe; zawór wydechowy

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2020
• Tom: Vol. 14, no 3
• Strony: 165--174
• Opis fizyczny: Bibliogr. 28 poz., fig., tab.

Twórcy

autor

Smoleńska Hanna

• Gdansk University of Technology, Department of Materials Science and Engineering, Narutowicza 11/13 , 80-233 Gdansk, Poland

autor

Kończewicz Włodzimierz

• Gdynia Maritime University, Department of Mechanical Engineering, Morska 83 81-225 Gdynia, Poland

autor

Bazychowska Sylwia

• Gdynia Maritime University, Department of Mechanical Engineering, Morska 83 81-225 Gdynia, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).