The degree of sensitization of ferritic AISI 430L (UNS S43000) stainless steel, prepared by powder metallurgy (PM), was examined by exposure methods (ASTM A763-93, Practice W and Practice Z) and electrochemical reactivation methods such as electrochemical potentiokinetic reactivation (EPR) and electrochemical potentiokinetic reactivation double-loop (EPRDL) tests. Two sintering atmospheres, vacuum and nitrogen-hydrogen, were chosen. The latter was the focus of the work and the former was used for comparison. It was seen that nitrogen played an important role in the degree of sensitization, either when dissolved or in intermetallic precipitates. Because heat treatment was necessary to control the microstructural features, a set of heat treatments was established: annealing and aging at 100, 200, 300, 375, 675, and 875°C for different times (90 min and 4, 6, 8, and 48 h). The effect of nitrogen and temperature-time aging on corrosion resistance was investigated. Experimental results showed that there was an optimal aging heat treatment for nitrogen-sintered stainless steel in comparison to vacuum-sintered samples. Furthermore, the results indicated that the electrochemical reactivation methods used for PM ferritic stainless steels were suitable to evaluate the degree of sensitization. Effects of the heat treatments were discussed as the consequence of two competing mechanisms: dissolution and phase precipitation of nitrogen.
Skip Nav Destination
Article navigation
1 January 2008
Research Article|
January 01 2008
Sensitization of Powder Metallurgy Type 430L Stainless Steel Sintered in Nitrogen-Hydrogen Atmosphere
F. Martín;
F. Martín
‡
*Ingeniería de Materiales, E.T.S.I.I., Universidad de Valladolid, Paseo del Cauce s/n, 47011 Valladolid,
Spain
.‡Corresponding author. E-mail: [email protected].
Search for other works by this author on:
C. García;
C. García
*Ingeniería de Materiales, E.T.S.I.I., Universidad de Valladolid, Paseo del Cauce s/n, 47011 Valladolid,
Spain
.
Search for other works by this author on:
P. de Tiedra;
P. de Tiedra
*Ingeniería de Materiales, E.T.S.I.I., Universidad de Valladolid, Paseo del Cauce s/n, 47011 Valladolid,
Spain
.
Search for other works by this author on:
Y. Blanco;
Y. Blanco
*Ingeniería de Materiales, E.T.S.I.I., Universidad de Valladolid, Paseo del Cauce s/n, 47011 Valladolid,
Spain
.
Search for other works by this author on:
M.L. Aparicio
M.L. Aparicio
*Ingeniería de Materiales, E.T.S.I.I., Universidad de Valladolid, Paseo del Cauce s/n, 47011 Valladolid,
Spain
.
Search for other works by this author on:
‡Corresponding author. E-mail: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
2008
CORROSION (2008) 64 (1): 70–82.
Citation
F. Martín, C. García, P. de Tiedra, Y. Blanco, M.L. Aparicio; Sensitization of Powder Metallurgy Type 430L Stainless Steel Sintered in Nitrogen-Hydrogen Atmosphere. CORROSION 1 January 2008; 64 (1): 70–82. https://doi.org/10.5006/1.3278464
Download citation file:
Citing articles via
Suggested Reading
Improvement in Mechanical Properties and Corrosion Resistance of Powder Metallurgy Type 430L Stainless Steel Sintered in Nitrogen-Hydrogen Atmosphere
CORROSION (June,2009)
Influence of the Heat Treatments on the Corrosion Resistance of a Duplex Stainless Steel Manufactured by Powder Metallurgy
CORROSION (January,2006)
Effect of Tempering Treatments on Microstructure and Intergranular Corrosion of 13 wt% Cr Martensitic Stainless Steel
CORROSION (December,2016)