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Journal ArticleDOI

Stress corrosion cracking of maraging steel weldments

TL;DR: In this article, the authors investigated the stress corrosion characteristics of 18 wt-%Ni (MDN-250) maraging steel and its weldments made under different welding conditions.
Abstract: The stress corrosion characteristics of 18 wt-%Ni (MDN-250) maraging steel and its weldments made under different welding conditions have been investigated. The threshold stress intensity factor K ISCC in stress corrosion conditions has been determined in 3.5 wt-%NaCl environment for the base metal and weldments. The fractured surfaces were analysed to study the types of fracture during stress corrosion cracking in base and weld metals. Fracture toughness tests were carried out and the results obtained from these tests have been compared with K ISCC values.
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TL;DR: In this paper, 4-(N,N-diethylamino)benzaldehyde thiosemicarbazone (DEABT) was studied for its corrosion inhibition property on the corrosion of aged 18 Ni 250 grade maraging steel in 0.67 M phosphoric acid at 30-50°C by potentiodynamic polarization, EIS and weight loss techniques.

64 citations

Journal ArticleDOI
TL;DR: In this article, the corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulfuric acid by 3,4-dimethoxybenzaldehydethiosemicarbazone (DMBTSC) has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques.
Abstract: The corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulfuric acid by 3,4-dimethoxybenzaldehydethiosemicarbazone(DMBTSC) has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) techniques. The inhibition efficiency increased with the increase in inhibitor concentration and decreased with the increase in temperature. Polarization curves indicated mixed type inhibition behavior affecting both cathodic and anodic corrosion currents. The thermodynamic parameters of corrosion and adsorption processes were evaluated. The adsorption of DMBTSC on the aged maraging steel surface was found to obey the Langmuir adsorption isotherm model, and the calculated Gibb’s free energy values confirm the spontaneous adsorption. The results obtained by the two techniques were in good agreement.

50 citations

Journal ArticleDOI
TL;DR: In this article, a maraging steel, an ultra high strength steel, is welded using FSW process and it was observed that FSW joints demonstrated higher resistance to stress corrosion cracking (SCC) compared to both, base metal and gas tungsten arc weldments.

36 citations

Journal ArticleDOI
TL;DR: In this article, the effect of cathodic polarisation on stress corrosion cracking (SCC) behavior of peak-aged Ni(Fe, Al)-maraging steel in artificial seawater was investigated.

31 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the published work on austenite reversion and its effects on properties and performance, covering both base metal and weld joints, is presented, where the authors analyze the impact of the reversion on the performance of the weld joints.
Abstract: In the heat-treated condition, 18% Ni maraging steels have a microstructure of aged martensite and essentially no austenite. However, austenite can form if the material is overaged. This has been termed as austenite reversion, a subject which has received much attention, because it importantly influences properties and performance of the steel. Reversion of austenite in fusion zones of weld joints in these steels has also been widely studied. Because of microsegregation, austenite reversion in the fusion zone is accelerated. Reverted austenite in the fusion zone strongly influences the performance of the weld joints. The present review critically analyses the published work on austenite reversion and its effects on properties and performance, covering both base metal and weld joints.

21 citations


Cites background from "Stress corrosion cracking of maragi..."

  • ...[33] carried out studies on weldments of C18Ni1700 produced by two different filler wires W1 and W2....

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References
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Journal ArticleDOI
TL;DR: In this paper, the modified wedge opening loading (WOL) technique was used to determine the stress intensity of maraging steel for various durations and showed that there is no appreciable deterioration in K in oil and water inhibited with 1.5% and 2% dichromate.
Abstract: Stress intensity, K, values for 18 Ni 1800 MPa maraging steel stressed to 90% of its KIC level and exposed to water, hydraulic oil (servo 317) and water inhibited with 0.5, 1.0, 1.5 and 2% dichromate (pH about 7.5) for various durations were determined using the modified wedge opening loading (WOL) technique. Experiments revealed that there is no appreciable deterioration in K in oil and water inhibited with 1.5% and 2% dichromate even after 25 days exposure. The threshold stress intensity is reached after 15 days in 0.5% dichromate inhibited water at 40 MPa m1/2. Stress corrosion crack growth rate in water is about 40 times the rate in hydraulic oil. Crack path characteristics of the WOL-tested maraging steel specimens in different environments are briefly mentioned.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the presence of particules de carbure de titane is investigated vis-a-vis de la tenacite and a plus d'importance que les autres caracteristiques microstructurales.

9 citations

Journal ArticleDOI
TL;DR: In this paper, the tensile properties of laser-welded T-250 maraging steel are measured, with attention paid to the influence of strain rate and gaseous hydrogen on the fracture behavior of welded specimens.
Abstract: The tensile properties of laser-welded T-250 maraging steel are measured, with attention paid to the influence of strain rate and gaseous hydrogen on the fracture behavior of welded specimens. Post-weld heat treatments are performed on laser-welded specimens to obtain underaged (WU), peak-aged (WP), and overaged (WO) specimens. Hydrogen embrittlement (HE) affects the tensile fracture behavior of the welded specimens; HE changes not only the fracture mode but also the fracture location. Without the influence of hydrogen, the fracture location is at the softest region, the weld metal (WM), and the fracture appearance reveals a ductile dimple fracture. For welds sensitive to HE, the fracture is initiated at the heat-affected zone (HAZ) with coarse grain size, and the associated fracture surface exhibits intergranular and quasi-cleavage fractures that are brittle in nature. In addition, the HAZ with coarse grain size is more prone to HE, as compared to other regions in the welded specimens. The WU specimens are susceptible to HE in air under a low strain rate, while the WP specimens are only susceptible to gaseous hydrogen embrittlement (GHE). However, the WO specimens are immune to GHE and insensitive to strain rate.

8 citations

Journal ArticleDOI
TL;DR: In this article, four grades of high strength maraging steel were tested in air and aqueous solutions for susceptibility to stress corrosion cracking and hydrogen embrittlement, and the strongest steels were the most susceptible to embrittlements.
Abstract: Four grades of high strength maraging steel were tested in air and aqueous solutions for susceptibility to stress corrosion cracking and hydrogen embrittlement. Electrochemical methods were used to characterize each alloy and to control the test conditions during slow strain rate tensile tests. Environment sensitive failure was observed under conditions in which either stress corrosion cracking or hydrogen embrittlement mechanisms were likely. The strongest steels were the most susceptible to embrittlement. Hydrogen was readily removed by baking which restores the original properties. Steels in the ‘soft’ condition were not susceptible. Protective oxide coatings were found to be ineffective in reducing hydrogen embrittlement but they improved the resistance to stress corrosion cracking under the anodic conditions used in these slow strain rate tests.

6 citations

Journal ArticleDOI
TL;DR: In this paper, the susceptibility of 18 Ni 200 maraging steel (1380 MPa YS) to environmental cracking in 3.5% NaCI solution has been investigated.
Abstract: The susceptibility of 18 Ni 200 maraging steel (1380 MPa YS) to environmental cracking in 3.5% NaCI solution has been investigated. This alloy has been found to be susceptible to cracking due to hydrogen embrittlement, with KISCC < 26 MPa·m½ at −1.10VSCE. Deoxygenation of the salt solution has been shown to greatly decrease the time to failure when the alloy is subjected to the mildly hydrogen embrittling conditions given by coupling to cadmium.

5 citations