Tribological and Corrosive Properties of the Parts of Machines with Surface Alloy Layer

Abstract

There are presented the results of researches conducted on the steel cast with surface alloy layer in this work. The measurement of the thickness, hardness and abrasion wear resistance was conducted in accordance with norm ASTM G 65-00. The measurement of the corrosion resistance was conducted in accordance with the potentio -dynamical method. It is shown that it is possible to obtain the alloy surface layer of different thickness by control of some factors: pouring temperature T zal , diameter of grain of FeCrC alloy Z w and the thickness of the cast wall g śo . It is proved that the smaller diameter of ferrochromium grain, the thicker surface alloy layer. It is also said that the higher pouring temperature and thicker the cast wall, the thicker surface alloy layer. What is more -the smaller thickness of the cast wall, the bigger hardness and abrasion wear resistance.Keywords: composite layer, ferrochromium, cast, abrasion wear resistance, corrosion resistance W artykule przedstawiono wyniki badań odlewu staliwnego z powierzchniową warstwą stopową. Badania obejmowały pomiar grubości, twardości, odporności na zużycie ścierne wykonane zgodnie z normą ASTM G 65-00 oraz odporności na korozję metodą potencjo-dynamiczną. W wyniku przeprowadzonych badań stwierdzono, że sterując w zadanym zakresie zmiennymi czynnikami procesu takimi jak temperatura zalewania staliwa T zal , średnica Z w ziarna stopu Fe-Cr-C i grubość ścianki odlewu g śo można uzyskać powierzchniową warstwę stopową o różnej grubości. Wyniki badań dowiodły również, że stosowanie na wkładkę stopową żelazochromu o mniejszej średnicy ziarna powoduje powstanie powierzchniowej warstwy stopowej o większej grubości, podobnie jak przy wzroście temperatury zalewania i grubości ścianki odlewu. Ponadto stwierdzono, że im mniejsza grubość ścianki odlewu tym uzyskuje się większą twardość warstwy i odporność na zużycie ścierne.

Manufacturing Methods of Alloy Layers on Casting Surfaces

“…Therefore, this technology can be significantly competitive for the commonly used technologies of surfacing by welding and thermal spraying because, in addition to its economic advantages, it does not generate opportunities for the development of cracks in the heat-affected zone that may arise as a result of making the layer by using the welding method. In general, the technology of cast bimetals containing a working layer and a base part is carried out based on two systems; i.e., liquid-liquid [1,2] and liquid-solid [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. An example of the former is a technology in which two independent gating systems are made, which guarantees a two-stage filling of the sand mold cavity.…”

The role of sustainable construction in sustainable development

“…Sustainable development is a necessity. It applies to everyone, starting from large corporations, to small enterprises, to every single person who realizes this idea by waste sorting [4][5][6][7]. As far as the environment is concerned, the Earth is shrinking and if we do not start to look after it, then for the next generations there may not be enough resources.…”

“…The first action plans to protect the Earth and its natural resources were discussed during the World Conference in Stockholm in 1972 ("Only one Earth") [1][2][3][4]. The ecological and social problems and the resulting threats have become an inspiration for the development of the concept of sustainable development.…”

“…The term "sustainable development" was first used in the Brundtland Report (1987) developed by the UN World Commission on Environment and Development. [1,[3][4][5][6] The concept of sustainable development does imply limits -not absolute limits but limitations imposed by the present state of technology and social organization on environmental resources and by the ability of the biosphere to absorb the effects of human activities [1]. Sustainable development is a necessity.…”

Composite Coatings with Ceramic Matrix Including Nanomaterials as Solid Lubricants for Oil-Less Automotive Applications

“…It is possible due to a formation of a permanent boundary lubricant layer, provided the pairing is lubricated with oil or greases. In vehicles, including engines and air compressors, the aim is to replace the oils and greases with solid lubricants [1][2][3][4]. To maintain the lubricating properties of oils (viscosity) it is necessary to ensure a proper cooling of compressors and engines which would result in their lower performance.…”