NEW METHOD FOR ESTIMATION OF MACROSTRUCTURE AND MATERIAL DEFECTS BY MEANS OF A COMPUTER IMAGE ANALYSER (286,00 руб.)

ПРОГРЕССИВНЫЕ ТЕХНОЛОГИИ В МАШИНОСТРОЕНИИ THE ADVANCED TECHNOLOGIES IN MECHANICAL ENGINEERING Grazyna Kalinowska, Jan Tacikowski NEW METHOD FOR ESTIMATION OF MACROSTRUCTURE AND MATERIAL DEFECTS BY MEANS OF A COMPUTER IMAGE ANALYSER Quantitative evaluation of surface’s topography and porosity of nitrided layers generated on steel 4340 during proc esses carried out in two various temperatures and two differentiated atmospheres have been done. <...> This evaluation was done by means of a computer image analyse. <...> This method allows the quick estimate of the structure of material and material defects, discontinuities and porosity. <...> Key words: image analyse, diffusion layers Introduction Research has been carried out for years over the quantitative evaluation of material defects, of the metallic and nonmetallic inclusions, of the structural defects which accelerate corrosive de struction and have influence on destruction of materials in various media. <...> The methods so far used refer to the standards both in case of the evaluation of the macrostruc ture [1, 2] and the corrosive changes of metals, metallic and nonmetallic coatings in various media [3, 4, 5]. <...> All these methods of evaluation have a very subjective, halfquantitative charac ter. <...> In many cases the occurrence of structural de fects or material defects is particularly dangerous in conditions where corrosive hazards exist be cause they can disqualify practical values of an applied technological solution. <...> In some cases, however, the appearance of such defects as pores in structure of surface layers can be good. <...> It can happen when nitrided layers are applied to protect steel elements against corrosion. <...> Such corrosion resistant layers are usually porous near their sur face. <...> From the side of corrosion resistance this porosity is disadvantageous; from the other side it allows impregnation of the layer with anticorro sive substances, containing corrosion inhibitors. <...> The proportions of compact and porous zones in the nitrided layers as well as participation, num ber, dimensions and morphology of pores decide about the corrosion resistance. <...> This problem – the analyse and evaluation of porous zones from the viewpoint of the use of the nitrided layers as corrosion protection – is the subject of this paper. <...> This program is very helpful when describing the changes of pores and disintegrated, irregular educts. <...> It is <...>