Evaluation of the Susceptibility of a Superduplex Stainless Steel Welded Joint to Sulfide Stress Corrosion by Slow Strain Rate Tensile Tests in Sour Solutions

CORROSION ◽  
2012 ◽  
Vol 68 (1) ◽  
pp. 015006-1-015006-8 ◽  
Author(s):  
V.G. Silva ◽  
S.S.M. Tavares ◽  
I.P. Baptista ◽  
J.R. de Oliveira
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Welded Joint ◽  
Tensile Tests ◽  
Slow Strain Rate ◽  
Sulfide Stress ◽  
Superduplex Stainless Steel

Stress Corrosion Behavior of AISI 304 Stainless Steel in a Boiling 42% MgCl2 Solution under Cyclic Slow Strain Rate Technique

CORROSION ◽  
1985 ◽  
Vol 41 (10) ◽  
pp. 592-597 ◽  
Author(s):  
T. Nakayama ◽  
M. Takano
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Slow Strain Rate ◽  
304 Stainless Steel ◽  
Slow Strain Rate Test ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Rate Test ◽  
Slow Strain Rate Technique

Abstract Stress corrosion cracking (SCC) behavior of AISI 304 stainless steel (SS) rod and plate specimens in boiling 42% MgCl2 was investigated using a monotonic and a cyclic slow strain rate technique (SSRT) in the crosshead speed (CHS) range from 6×10−5 to 1.5 mm/min. A maximum stress (σmax) of 50 to 330 MPa was selected in a cyclic slow strain rate test. A thermal cyclic stress test was also conducted in the solution. Fracture surface observations revealed that crack mode changed from transgranular to intergranular with increasing stress level in the SCC process, and the crack mode was independent of the CHS change. Time to failure in the cyclic slow strain rate test was constant at a given σmax in all CHS used (except slow CHS of 6×10−5 at σmax of 50 MPa). Crack propagation rate (da/dt) increased with the stress intensity factor, and it was independent of CHS. The corrosion potential varied with the stress cycle after cracking started; this indicated that SCC proceeded by a dissolution-repassivation mechanism. The cyclic slow strain rate test is recommended as an SCC test that can reproduce the actual service conditions of stress.

scholarly journals Cathodic and Anodic Stress Corrosion Cracking of a New High-Strength CrNiMnMoN Austenitic Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1541
Author(s):  
Mathias Truschner ◽  
Jacqueline Deutsch ◽  
Gregor Mori ◽  
Andreas Keplinger
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Constant Load ◽  
Corrosion Cracking ◽  
Slow Strain Rate ◽  
Induced Stress

A new high-nitrogen austenitic stainless steel with excellent mechanical properties was tested for its resistance to stress corrosion cracking. The new conventional produced hybrid CrNiMnMoN stainless steel combines the excellent mechanical properties of CrMnN stainless steels with the good corrosion properties of CrNiMo stainless steels. Possible applications of such a high-strength material are wires in maritime environments. In principle, the material can come into direct contact with high chloride solutions as well as low pH containing media. The resistance against chloride-induced stress corrosion cracking was determined by slow strain rate tests and constant load tests in different chloride-containing solutions at elevated temperatures. Resistance to hydrogen-induced stress corrosion cracking was investigated by precharging and ongoing in-situ hydrogen charging in both slow strain rate test and constant load test. The hydrogen charging was carried out by cathodic charging in 3.5 wt.% NaCl solution with addition of 1 g/L thiourea as corrosion inhibitor and recombination inhibitor to ensure hydrogen absorption with negligible corrosive attack. Slow strain rate tests only lead to hydrogen induced stress corrosion cracking by in-situ charging, which leads to total hydrogen contents of more than 10 wt.-ppm and not by precharging alone. Excellent resistance to chloride-induced stress corrosion cracking in 43 wt.% CaCl2 at 120 °C and in 5 wt.% NaCl buffered pH 3.5 solution at 80 °C is obtained for the investigated austenitic stainless steel.

scholarly journals Strength Enhancement of Superduplex Stainless Steel Using Thermomechanical Processing

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1094
Author(s):  
M. A. Lakhdari ◽  
F. Krajcarz ◽  
J. D. Mithieux ◽  
H. P. Van Landeghem ◽  
M. Veron
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Thermomechanical Processing ◽  
Tensile Tests ◽  
Image Correlation ◽  
Strength Enhancement ◽  
Industrial Material ◽  
Superduplex Stainless Steel ◽  
The Impact ◽  
Strength Improvement

The impact of microstructure evolution on mechanical properties in superduplex stainless steel UNS S32750 (EN 1.4410) was investigated. To this end, different thermomechanical treatments were carried out in order to obtain clearly distinct duplex microstructures. Optical microscopy and scanning electron microscopy, together with texture measurements, were used to characterize the morphology and the preferred orientations of ferrite and austenite in all microstructures. Additionally, the mechanical properties were assessed by tensile tests with digital image correlation. Phase morphology was not found to significantly affect the mechanical properties and neither were phase volume fractions within 13% of the 50/50 ratio. Austenite texture was the same combined Goss/Brass texture regardless of thermomechanical processing, while ferrite texture was mainly described by α-fiber orientations. Ferrite texture and average phase spacing were found to have a notable effect on mechanical properties. One of the original microstructures of superduplex stainless steel obtained here shows a strength improvement by the order of 120 MPa over the industrial material.

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