Study on the Influence of the Treatment in Magnetic Field on the Nitrided Layer in Plasma

Abstract

These researches have been made in order to improve the mechanical properties of a Chromium�Molybdenum alloyed steel non-conventionally treated in a magnetic field. Through the thermo-magnetic treatments, applied before thermo-chemical treatment, the mechanical properties of this material have been improved, especially in the case of a great content of chromium. The hardness values of the superficial layers which have been obtained after a complex system of thermo-magnetic treatments followed by a thermo-chemical treatment, the superficial layers content and the behaviour of the steel at the wear through dry friction tests were used as criterion. The paper is a review of the researches from the last few years.

Influence of Fertilization Systems on Physical and Chemical Properties of the Soil

“…Plant growth and development processes require large quantities of nutritive elements, extracted from soil through the roots. Consumption balance is possible by applying fertilizers, avoiding the lowering of soil's productive potential [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Evolution of the Plasticity of Some Low Carbon Steels, Subjected to Directed Cooling from High-temperature

“…All these steels are produced by controlling the cooling rate after hot rolling at high temperature on run-out table or cold rolling (in annealing furnace). A special attention can be made on higher loads during deformation [1,2], even these kind of steels do not brings new problems.…”

“…If we study the literature [1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] for steels with 0.1% C, 0.48% Mn, 0.24% Si, the microstructural parameters which determine the mechanical properties of the steels are the sizes and the shape of pearlitic (P) and ferritic (F) grains which form its microstructure. Ferrite has a low mechanical * email: euroinvent@yahoo.com strength but it has plastic properties.…”

“…These types of steels, for some parts of machine building, for example, are used current without chemical treatments. The steels with low carbon have high plasticity properties below 550 o C and the thermal stresses will not leads to the formation of cracks [1]. Damage in the case of materials represents the progressive or sudden deterioration of their mechanical strength which conducts to thermal or chemical effects [1,5,6].…”

“…The steels with low carbon have high plasticity properties below 550 o C and the thermal stresses will not leads to the formation of cracks [1]. Damage in the case of materials represents the progressive or sudden deterioration of their mechanical strength which conducts to thermal or chemical effects [1,5,6]. It is important to know how it is possible to improve the properties of the steels [5].…”