In any industrial operation, a major problem in the maintenance of tools, equipment and machinery is that of minimizing wear or recovering worn parts, the cost of which is less than the cost of changing them, for which it is important to recognize the problem and the way to recover them, which generally involves the application of a metallic coating by welding and machining for its finishing. But this is not everything, the most important thing is to know how and with what material to reprocess the piece; For this, it is necessary to know how to select the appropriate type of coating and its application process. The purpose of this work is to select the most suitable coating for the base metal of the worn part.

In any industrial operation, a major problem in the maintenance of tools, equipment and machinery is that of minimizing wear or recovering worn parts, the cost of which is less than the cost of changing them, for which it is important to recognize the problem and the way to recover them, which generally involves the application of a metallic coating by welding and machining for its finishing. But this is not everything, the most important thing is to know how and with what material to reprocess the piece; For this, it is necessary to know how to select the appropriate type of coating and its application process. The purpose of this work is to select the most suitable coating for the base metal of the worn part.

The present investigation has determined the average measure of grain size, including a Jeffries planimetric procedure in materials such as SAE 1010 carbon steel, and AISI 316 stainless steel. Likewise, the digital camera incorporated into the metallographic microscope, has enabled the application of image analysis for the study of the microstructure of materials.

The research project: Martensitic precipitation in AISI 304 stainless steel-corrosion cracking has determined that the material tested under different compressive loads, the austenite phase producing deformed martensite phase, which is magnetic. The accelerated corrosion test deformed martensite material having a solution of magnesium chloride in boiling 42% produces a type of corrosion transgranular.

The Project of Investigation called: Evaluation of the magnetic phase in Stainless steel AISI 304, worked in cold and its recovery by Heat Treatment has determined that the material of testing submitted to loads by compression is magnetized, which increasing its hardness and transforming partially the austenitic structure in martensitic. The material of transformed structure was submitted to heat treatment to 700 oC and 800 oC respectively which origins the recovery of the structure.

The Project of Investigation called: Evaluation of the magnetic phase in Stainless steel AISI 304, worked in cold and its recovery by Heat Treatment has determined that the material of testing submitted to loads by compression is magnetized, which increasing its hardness and transforming partially the austenitic structure in martensitic. The material of transformed structure was submitted to heat treatment to 700 oC and 800 oC respectively which origins the recovery of the structure.

The research project: Martensitic precipitation in AISI 304 stainless steel-corrosion cracking has determined that the material tested under different compressive loads, the austenite phase producing deformed martensite phase, which is magnetic. The accelerated corrosion test deformed martensite material having a solution of magnesium chloride in boiling 42% produces a type of corrosion transgranular.

The present investigation has determined the average measure of grain size, including a Jeffries planimetric procedure in materials such as SAE 1010 carbon steel, and AISI 316 stainless steel. Likewise, the digital camera incorporated into the metallographic microscope, has enabled the application of image analysis for the study of the microstructure of materials.

The influence of the moisture and sodium bentonite in the qualite moulding was tested; however one of the mixes was much better, which is the following: Sodium bentonite 7%, Water 4%, Silica sand 87%, ( AFS grain fineness 52). The physical properties of the molding sand was:permeability 235, green compresion, lb/in2 13,1. Cast nickel aluminium bronce Cu3 was tested: Tensile strength, kg/mm2 88,13, Yield strength, kg/mm2 28,3, Elongation in 2 inch, % 10, Metallography: etchant, amonium persulfate. Showing light a phase, eutectoide a + g2 and k phase.

The influence of the moisture and sodium bentonite in the qualite moulding was tested; however one of the mixes was much better, which is the following: Sodium bentonite 7%, Water 4%, Silica sand 87%, ( AFS grain fineness 52). The physical properties of the molding sand was:permeability 235, green compresion, lb/in2 13,1. Cast nickel aluminium bronce Cu3 was tested: Tensile strength, kg/mm2 88,13, Yield strength, kg/mm2 28,3, Elongation in 2 inch, % 10, Metallography: etchant, amonium persulfate. Showing light a phase, eutectoide a + g2 and k phase.

The present research work influences micro-alloys in the bronze alloy, studies the classification bronze Cu1, Cu2, Cu3 and Cu4, defines the structures to the molten state of the materials used in the manufacture of propellers for use in the naval industry . Chemical compositions, metallographic structures, limitations of chemical elements in mechanical properties, as well as limitations of chemical elements in welding processes are defined. The alloy tested, a bronze cast aluminum corresponds to the classification of the complex polyphasic aluminum subgroup 3 or Cu3 classification, NiAl bronze, has an average tensile strength of 64.86 kg / mm2, and an elongation in two inches of 24, 5, the metallographic structure phases are observed: a, a + g2 and k. The corrosion test with the Potentiostat PS4 equipment indicates a corrosion density of 0.38 mA / cm2, the activity in synthetic seawater ...

El presente trabajo de investigación influencia de los microaleantes en la aleación de los bronces, estudia los bronces de clasificación Cu1, Cu2, Cu3 y Cu4, define las estructuras al estado fundido de los materiales empleados en la fabricación de hélices de uso en la industria naval. Se define las composiciones químicas, las estructuras metalográficas, limitaciones de los elementos químicos en las propiedades mecánicas, así como las limitaciones de los elementos químicos en los procesos de soldadura. La aleación ensayada un bronce aluminio fundido corresponde a la clasificación de los cupro aluminio polifásico complejo subgrupo 3 o clasificación Cu3, NiAl bronce, presenta una resistencia a la tracción promedia de 64,86 kg/mm2, y un alargamiento en dos pulgadas de 24,5, la estructura metalográfica se observan fases: a, a+g2 y k. El ensayo de corrosión con el equipo Pote...

The Bismuth Brass Material which microstructure is formed by α and β crystals presents Bismuth inclusions in the grain boun- daries and in the grain. The Bismuth-Selenium Brass Material which microstructure is formed by α and β crystals presents Bismuth inclusions in the grain boundaries and in the grain; Selenium is presented in the grain boundaries. The mechanical properties are the following: Mean Properties I II Tensile Strength, Mpa 385 387 Yield Strength, Mpa 180 175 Elongation % 38,8 40,5 Hardness, BHN 110 112 The speed of electrochemistry corrosion in mpy, according to Tafel is the following: Material I Tap Water: mpy = 0.998 NaCl Solution at 3.56% mpy = 1.065 Material II Tap Water: mpy = 0.970 NaCl solution at 3.56%: mpy = 1.105

The Bismuth Brass Material which microstructure is formed by α and β crystals presents Bismuth inclusions in the grain boun- daries and in the grain. The Bismuth-Selenium Brass Material which microstructure is formed by α and β crystals presents Bismuth inclusions in the grain boundaries and in the grain; Selenium is presented in the grain boundaries. The mechanical properties are the following: Mean Properties I II Tensile Strength, Mpa 385 387 Yield Strength, Mpa 180 175 Elongation % 38,8 40,5 Hardness, BHN 110 112 The speed of electrochemistry corrosion in mpy, according to Tafel is the following: Material I Tap Water: mpy = 0.998 NaCl Solution at 3.56% mpy = 1.065 Material II Tap Water: mpy = 0.970 NaCl solution at 3.56%: mpy = 1.105