Analyzing the Real Area of Contact Wear Using ANOVA
Journal Title: RECENT - Year 2015, Vol 16, Issue 46
Abstract
Austempering is a relatively new treatment in the field of ductile iron casting. This heat treatment was found to improve the ductile irons at high levels of strength, rendering ductile iron castings superior to steel forgings Austempered ductile irons usually contain a large quantity of retained austenite that can help to optimize their mechanical properties. Many of the properties of austempered ductile iron depend on the austenite which is retained following the bainite reaction. The studied cast iron had the following composition: 3.70 %C; 2.46 %Si; 0.56 %Mn; 0.038 %P; 0.009 %S; 0.25 %Mo; 0.23 %Cu; 0.065 %Mg. This cast iron was elaborated in an induction furnace. Nodular changes were obtained with the "In mold" method, with the help of prealloy FeSiCuMg with 10-16% Mg, added into the reaction chamber in a proportion of 1.1% of the treated cast iron. The structure in raw state is perlito-feritic typical for a cast iron with geometrically regular nodular form. The casted raw iron had the following mechanical properties: Rm = 650 N/mm2, HB = 180; KC = 10 J/cm2; A = 12 %. The paper presents an example of calculation for the one-way repeated measures applied for the results of an austempered ductile iron. This research has a number of objectives which can be started as follows: to calculate the real area variation (Ar) at the end of a bainitic S.G. cast iron wear process, study of the real wear contact values (Ar) variation, depending on the isothermal heat treatment parameters (Tiz and τiz ) and the micro hardness HV0.01 for FN = 4 kgf, the calculation for the one-way repeated measures applied for the results of the real area variation (Ar).
Authors and Affiliations
Ioan MILOŞAN
Keywords
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