The summary of the author's abstract of the master's thesis candidat dissertation
Kolesnikov V. A. Increasing of operational properties of austenitic manganese cast iron by alloying of carbide creating elements. √ Manuscript.
Thesis for a Degree of Candidate of Science (Engineering) in speciality 05.02.01 √ Material Science. √ G.V. Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine, Lviv, 2005.
Thesis is devoted to investigation of the interaction between the parameters of structure and properties of Fe√C√Mn alloys (perspective materials for the friction knots) on their operating firmness in the conditions of sliding friction (maximum dry) at the different loading and speed parameters.
It was carried out executed statistical and analytical analyses of the obtained experimental data and also results of the operational tests. The adequate mathematical models (polynomial) describe the influence of the varied alloying elements on mechanical and tribo-technical properties of alloys. It was carried out cНrelations of the analysis between structure and intensity of fracture in the conditions of crack growth resistance, corrosion resistance and wear resistance. Crack growth resistance experimental data: й1я = 44┘55 лпЮ , Δйth = 4,6┘6,3 лPЮ , Δйfc = 36┘50 лпЮ .
It was carried out comparative tests of samples made from Fe√C√Mn alloys (вм15ду2 and grey cast-iron яв 20), bronze (аПюфлЖ, аПнт 6,5-0,4) in a loadings range 1,0┘.6,0 лPЮ and sliding speeds 0,628┘.2,1 m/s in the conditions of boundary and dry friction. It was established, that alloys in the conditions of dry and boundary friction do not be highly competitive and in some range of loading-speed characteristics surpass on wear resistance alloys. It is established, that the period of intensive coupler at manganese cast iron comes at loadings of п = 7,8┘11,0 лPЮ and speeds of sliding of 0,628 m/s.
Investigation of wear products, friction surfaces was glowed on the material, which located directly near a zone of friction and has allowed to established the basic laws of fracture of the alloys in conditions of friction sliding (take to account the influence of structural √ phase and loading-speed parameters). It was established, that increase of hardness and change of structural-phase structure of the investigated alloys in conditions of dry friction at constant loading and high-speed modes can be accompanied by reduction of intensity of wear process, that is transition from pathological modes of destruction of a material to a normal operating mode wear process.
On the basis of results of laboratory and in-service tests it was given the recommendations for structure and properties, what the alloy (in tools) must achieve for high wear resistance in the certain range of loading-speed parameters should own in view of friction sliding.
Keywords: Manganese cast√iron, austenite, crack growth resistance, wear resistance, wear products, corrosion resistance, operational stability.