This research refers to the grey iron lamellar graphite casting and nodular cast iron casting. Both contain variable percentages of copper to a maximum of 4%, cooled in sand molds in which the apparent solubility of copper is limited, to obtain wear-resistant castings, improving the hardenability of gray cast iron and nodular cast iron by the effect of stabilizing the austenite.

This research refers to the grey iron lamellar graphite casting and nodular cast iron casting. Both contain variable percentages of copper to a maximum of 4%, cooled in sand molds in which the apparent solubility of copper is limited, to obtain wear-resistant castings, improving the hardenability of gray cast iron and nodular cast iron by the effect of stabilizing the austenite.

HY-80 steels; HY-130, such as HP9-4-20; 10Ni-Cr-Mo-Co are the strongest of the special tenacity and highest creep resistance properties, which have been developed for use in critical hydrospace and aerospace applications. In HY-80 type steel, the alloying elements that give high characteristics to the steels, in turn, increase the hardening power and therefore their tendency to crack. The relationship of the microstructure to the toughness property is evaluated for the welded metal and the region of the heat affected zone. SAW, SMAW or EBW welding processes are used in the manufacture of metal structures with these types of materials, however, in repairs or maintenance, the manual metal arc process with low hydrogen coated electrodes, with an adequate sequence and prior control to the qualification of the welder as well as the process in particular, allow presenting this work with satisf...

HY-80 steels; HY-130, such as HP9-4-20; 10Ni-Cr-Mo-Co are the strongest of the special tenacity and highest creep resistance properties, which have been developed for use in critical hydrospace and aerospace applications. In HY-80 type steel, the alloying elements that give high characteristics to the steels, in turn, increase the hardening power and therefore their tendency to crack. The relationship of the microstructure to the toughness property is evaluated for the welded metal and the region of the heat affected zone. SAW, SMAW or EBW welding processes are used in the manufacture of metal structures with these types of materials, however, in repairs or maintenance, the manual metal arc process with low hydrogen coated electrodes, with an adequate sequence and prior control to the qualification of the welder as well as the process in particular, allow presenting this work with satisf...

Manufacturing parts cast iron covers a very large field of machinery industry. These materials are iron-carbon alloys, with high percentages of carbon and designated under the name of foundries as this is the industrial process of manufacture thereof. The highest percentage of carbon makes the melting temperature of these is less than that of the steels and also a greater flow of liquid material is achieved which allows the filling of smaller thickness pieces of complex shapes and have improved castability . Moreover, the lower melting temperature allows the metal-mold interaction is less aggressive and thus can obtain a better surface quality parts. Its low cost, and this excellent castability, have led to extensive development of these alloys in applications such as engine blocks, shirts piston, gears, valve bodies, auto parts and many other parts for industrial use. The choice of mate...

Manufacturing parts cast iron covers a very large field of machinery industry. These materials are iron-carbon alloys, with high percentages of carbon and designated under the name of foundries as this is the industrial process of manufacture thereof. The highest percentage of carbon makes the melting temperature of these is less than that of the steels and also a greater flow of liquid material is achieved which allows the filling of smaller thickness pieces of complex shapes and have improved castability . Moreover, the lower melting temperature allows the metal-mold interaction is less aggressive and thus can obtain a better surface quality parts. Its low cost, and this excellent castability, have led to extensive development of these alloys in applications such as engine blocks, shirts piston, gears, valve bodies, auto parts and many other parts for industrial use. The choice of mate...

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 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