Modificações estruturais induzidas por hidrogenação catódica em aço austenítico soldado e nitretado a plasma

Abstract

ResumoNesse trabalho, apresentamos a caracterização estrutural de regiões soldadas em aço austenítico AISI-304, que foram submetidas a processo de nitretação a plasma (20%N 2 + 80%H 2 ). Posteriormente as amostras foram hidrogenadas catodicamente. As temperaturas de nitretação foram de 400, 500 e 550°C. As regiões da solda e fora da solda hidrogenadas após a nitretação foram comparadas por DRX, microscopia ótica e microscopia eletrônica de varredura (MEV). As fases austenita-, martensita-', martensita-, ferrita- e os nitretos CrN, '-Fe

Influence of Hastelloy’s Cathodic Cage Plasma Deposition on Corrosion Resistance of AISI 304 Stainless Steel and of AISI D6 Tool Steel

“…Based on these cards, the XRD theoretical profile with its specific positions was modeled. The parameters obtained with refinement: R p (%) = 5.770, R exp (%) = 2.873, R wp (%) = 7.608, χ 2 = 6.416 and GOF = 2.533, prove this agreement 23,48 . The experimental lattice parameters, atomic positions, and positions occupancy calculated by the Rietveld refinement method 23,41 are presented in Table 5.…”

“…The peaks positions are in accordance with the results published in the Inorganic Crystal Structure Database (ICSD), cards N° 31901 44 , 76667 45 , 654542 49 , 53146 47 and 31156 50 , the XRD theorical profile with its specific positions was modeled from these cards. The parameters obtained with the refinement: Rp (%) = 4.560, Rexp (%) = 3.623, Rwp (%) = 6.568, χ2 = 3.287 and GOF = 1.813, prove the agreement 23, 48 . The experimental lattices, atomics positions and positions occupancy calculated by Rietveld refinement method 23,41 are presented in Table 4.…”