Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Examination of the microstructure and properties of austenitic-martensitic welded joint

nr katalogowy: 79725

Bimetal engine valves for internal combustion engines are made from two kinds of materials due to the improved performance of this type of construction, especially in highly loaded exhaust systems [1, 2]. The valves head exposed to the highest temperature is made of austenitic stainless steel. The more mechanically loaded valve stem is made of martensitic stainless steel for engine valves [3÷5]. Both parts are joined together by friction welding method. In addition, valve durability is enhanced by cladding on the valve head surface very hard alloy coating - stellite, resistant to high temperature and corrosive influences. Thus, careful selection of materials and joining technology is the basic factor in the long time durability. The aim of the study was to determine the structure and properties of welded austenitic-martensitic joint of valve steels. Welded connection of the valves occurring in combustion engines was used for the tests. The study of microstructure was performed using the light microscopy (LM), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The profile of microhardness of weld joint was also studied. MATERIAL AND METHODOLOGY The experimental material was welded joint of exhaust bimetal engine valve made from two grades of valve steels: -valve head and adjoining part of the stem was made of X50CrMnNiNbN21-9 austenitic steel, -valve stem was made of X45CrSi9-3 martensitic steel. The test specimens were cut from the weld, heat-affected zone and the base metal. Metallographic examination on these samples was performed using Zeiss AxioImager M1m light microscope. The microhardness profile and microstructure examination were performed using NEON 40EsB Zeiss Crossbeam scanning electron microscope. Microstructural examination was also carried out using JEM200CX transmission el[...]

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INŻYNIERIA MATERIAŁOWA - e-zeszyt (pdf) 2013-4 licencja: Osobista Produkt cyfrowy	65.00 zł

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PRZEGLĄD WŁÓKIENNICZY - WŁÓKNO, ODZIEŻ, SKÓRA - PAKIET prenumerata PLUS	450.00 zł brutto 416.67 zł netto 33.33 zł VAT (stawka VAT 8%)

450.00 zł

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2013-4

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