Browsing by Autor "Rigoberto Reinoza Contreras"

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COMPORTAMIENTO DE 3 FAMILIAS DE ACEROS INOXIDABLES ANTE SOLICITUDES TRIBOLÓGICAS DE ABRASIÓN Y EROSIÓN
(2001) J. L. Suárez; Xenia Suárez; Rigoberto Reinoza Contreras
Comportamiento de los aceros inoxidables AISI 304, AISI 329 y AISI 420 sometidos a desgaste erosivo
(2000) Rigoberto Reinoza Contreras; J. L. Suárez
The present work studies the behaviour of AISI 304, AISI 329 and AISI 420 stainless steels types under erosive wear. The three materials were submit to erosive wear with two particle impact speeds and four incidence angles. The test results show that the speed influence over the erosion for each steel. The behaviour of the stainless submits to erosion wear is defined by the structure of each one and impact speed of the impact particles. For a speed of 38 m/s and a impact angle of 45o and 90o, the lowest erosion resistance is shown by the AISI 420 stainless steel type, but for 60o and 90o impact angles, the lowest erosion resistance is shown by the AISI 329 stainless steel. . For 78 m/s impact speed, the lowest erosion resistance is shown by the AISI 329 stainless steel, independently of the particles impact angle.
Efecto del H2SO4 1.0 N en la propagacion de la grieta por fatiga en los aceros inoxidables del tipo austenitico y martensitico
(2001) Rigoberto Reinoza Contreras
In this paper the effect of H2SO4 solution on the fatigue crack propagation speed of the austenitic stainless steels (AISI 304) and martensitic stainless steels (AISI 420) were studied. The test were carried out using a compact sample type to a value of R and DP constant in air and in H2SO4 1.0 N solution. The results show that the sulfuric acid solution modifies lightly DK values for crack initiation in both materials, in a more significant way for the martensitic stainless steel than for the austenitic one. On the other hand, it is observed that the corrosive environment produces an increment on the crack propagation speed greater in the AISI 420 steel than the AISI 304 steel. The studies of the fracture surface at the scanner electronic microscope (SEM) show that the corrosive environment modifies sensitivity the striation mechanism of crack propagation at the austenitic structure, and it produces a bigger disruption at the martensitic structure.