scholarly journals Corrosion Failure of AISI4340 Steel in Oxygen-Containing Aqueous Chloride Solution

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Ping Zhang ◽  
Yafei Shi ◽  
Hanqing Zhao ◽  
Fulin Zhang ◽  
Guoqiang Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ductile Fracture ◽  
Simultaneous Action ◽  
Corrosion Failure ◽  
Cracking Behavior ◽  
4340 Steel ◽  
Brittle Rupture ◽  
Aqueous Chloride ◽  
Tensile Experiment ◽  
Aisi4340 Steel

Stress corrosion cracking behavior of 4340 steel in oxygen-containing or chloride containing aqueous solution was researched, the tensile experiment results indicated 100°C deaerated distilled water, the rupture of 4340 steel mainly belongs to ductile fracture, the addition of oxygen or chloride would increase the SCC tendency of 4340 steel and transformed the rupture mechanism from ductile fracture to brittle rupture, the existence of oxygen or chloride would decreaseKISCCof 4340 steel in 100°C aqueous solution slightly, the simultaneous action of oxygen and chloride existed, and the simultaneous action would further increase the SCC tendency of 4340 steel in aqueous solution.

A Micromechanics Approach to Assess Ductile Crack Initiation in Damaged Pipelines

2003 ◽  
Author(s):  
Claudio Ruggieri ◽  
Fernando F. Santos ◽  
Mitsuru Ohata ◽  
Masao Toyoda
Keyword(s):  
Ductile Fracture ◽  
Large Scale ◽  
Cell Model ◽  
High Strength ◽  
Void Coalescence ◽  
Model Parameters ◽  
Ductile Crack ◽  
Cracking Behavior ◽  
Damage Criterion ◽  
Limited Applicability

This study explores the capabilities of a computational cell framework into a 3-D setting to model ductile fracture behavior in tensile specimens and damaged pipelines. The cell methodology provides a convenient approach for ductile crack extension suitable for large scale numerical analyses which includes a damage criterion and a microstructural length scale over which damage occurs. Laboratory testing of a high strength structural steel provides the experimental stress-strain data for round bar and circumferentially notched tensile specimens to calibrate the cell model parameters for the material. The present work applies the cell methodology using two damage criterion to describe ductile fracture in tensile specimens: (1) the Gurson-Tvergaard (GT) constitutive model for the softening of material and (2) the stress-modified, critical strain (SMCS) criterion for void coalescence. These damage criteria are then applied to predict ductile cracking for a pipe specimen tested under cycling bend loading. While the methodology still appears to have limited applicability to predict ductile cracking behavior in pipe specimens, the cell model predictions of the ductile response for the tensile specimens show good agreemeent with experimental measurements.

scholarly journals Extraction of Rare Earth Elements from Chloride Media with Tetrabutyl Diglycolamide in 1-Octanol Modified Carbon Dioxide

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 429 ◽  
Author(s):  
Mary Case ◽  
Robert Fox ◽  
Donna Baek ◽  
Chien Wai
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Modern World ◽  
Ndfeb Magnet ◽  
Phosphor Material ◽  
Aqueous Chloride ◽  
Hcl Concentration ◽  
Optimized Conditions

Rare earth elements (REEs) are critical to our modern world. Recycling REEs from used products could help with potential supply issues. Extracting REEs from chloride media with tetrabutyl diglycolamide (TBDGA) in carbon dioxide could help recycle REEs with less waste than traditional solvents. Carbon dioxide as a solvent is inexpensive, inert, and reusable. Conditions for extraction of Eu from aqueous chloride media were optimized by varying moles percent of 1-octanol modifier, temperature, pressure, Eu concentration, TBDGA concentration, Cl− concentration, and HCl concentration. These optimized conditions were tested on a Y, Ce, Eu, Tb simulant material, REEs containing NdFeB magnets, and lighting phosphor material. The optimized conditions were found to be 23 °C, 24.1 MPa, 0.5 mol% 1-octanol, with an excess of TBDGA. At these conditions 95 ± 2% Eu was extracted from 8 M (mol/m3) HCl. Extraction from the mixed REE simulate material resulted in separation of Y, Eu, and Tb from the Ce which remained in the aqueous solution. The extraction on NdFeB magnet dissolved into 8 M HCl resulted in extraction of Pr, Nd, Dy, and Fe >97%. This results in a separation from B, Al, and Ni. Extraction from a trichromatic lighting phosphor leachate resulted in extraction of Y and Eu >93% and no extraction of Ba, Mg, and Al.

Environmental Effects of Anthraquinone Derivatives on the Resistance to SCC of AISI 4340 Steel in Aqueous Chloride Solutions

CORROSION ◽  
1969 ◽  
Vol 25 (10) ◽  
pp. 434-437
Author(s):  
A TIRMAN ◽  
PAUL FUGASSI ◽  
E. G. HANEY
Keyword(s):  
Sodium Chloride ◽  
Atomic Hydrogen ◽  
Chloride Solution ◽  
Reduced Form ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Anthraquinone Derivatives ◽  
Aqueous Chloride ◽  
Derivatives Of ◽  
Aisi 4340

Abstract Polyhydroxy derivatives of anthraquinone adsorbed on AISI 4340 steel foil increase the resistance of the foil to stress corrosion cracking in aerated 0.6 M aqueous sodium chloride acidified with hydrogen chloride to pH 1.5. It is suggested that these compounds act as acceptors of atomic hydrogen or of other intermediates involved in the electrolytic discharge of hydrogen and that the reduced form of the compound is re-oxidized to its original state by dissolved oxygen in the sodium chloride solution.

The Environmental Cracking of Ticode-12® in Aqueous Chloride Environments

CORROSION ◽  
1985 ◽  
Vol 41 (10) ◽  
pp. 560-569 ◽  
Author(s):  
N. R. Sorensen ◽  
J. A. Ruppen
Keyword(s):  
Mechanical Properties ◽  
Base Alloy ◽  
Open Circuit ◽  
Environment Effect ◽  
High Hydrogen ◽  
Cracking Behavior ◽  
Strain Behavior ◽  
Aqueous Chloride ◽  
Slow Strain Rate Technique ◽  
Very High

Abstract The slow strain rate technique (SSRT) was used to assess the environmental cracking behavior of TiCode-12, a titanium-base alloy, in a simulated repository brine. The hydrogen effects and electrode potential were examined to understand the alloy's hydrogen embrittlement (HE) and stress corrosion cracking (SCC) behavior. At open circuit, no environment effect was noted, as the results in air and brine were essentially identical. Hydrogen precharging of the samples resulted in a microstructure change, and at very high hydrogen levels, a degradation in mechanical properties. Anodic polarization of the Grade 12 Ti had no effect on mechanical properties, again indicating that the alloy is not susceptible to SCC. Severe cathodic polarization results in a change in both fracture mode and macroscopic stress-strain behavior. However, the conditions under which these changes were observed are considered to be much more severe than those encountered in the proposed repository sites.

Cracking Behavior of Oxide Films under Applied Stress

2011 ◽  
Vol 284-286 ◽  
pp. 671-675
Author(s):  
Si Xian Rao ◽  
Su Ping Yang ◽  
Ji Bin Tong ◽  
Jing Ru Wang
Keyword(s):  
Aqueous Solution ◽  
Oxide Film ◽  
Applied Stress ◽  
Oxide Films ◽  
Cracking Behavior ◽  
Cracking Stress

Cracking behaviors of oxide films on A3, 30CrMnSiA steel under applied stress were investigated in this paper. Theoretical deductions confirmed that critical cracking conditions for oxide films on A3 and 30CrMnSiA steel did exist. Electrochemical tensile experiments in 3%NaCl aqueous solution showed that the critical cracking stress for oxide film on A3 steel is about 220MPa,the critical cracking stress for oxide film on 30CrMnSiA steel is about 80MPa.In-situ dynamic tensile experiments verified the correctness of the experiments results in the electrochemical tensile experiments.

scholarly journals Microstructure and Corrosion Behaviour of ZnNiP Thin Film Alloys in Deep Eutectic Solvent Ionic Liquids

2020 ◽  
Vol 71 (1) ◽  
pp. 28-38
Author(s):  
Elena Ionela Neacsu ◽  
Virgil Constantin ◽  
Marian Burada ◽  
Cristina Donath ◽  
Vasile Soare ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Aqueous Solution ◽  
Ionic Liquids ◽  
Photoelectron Spectroscopy ◽  
Corrosion Behaviour ◽  
Deep Eutectic Solvent ◽  
Passive Layer ◽  
X Ray ◽  
Aqueous Chloride

Ternary ZnNiP alloy thin films were electroless deposited from aqueous chloride electrolytes on mild steel foils. The films were characterized by scanning electron microscopy (SEM) and dispersive X-ray microanalysis (EDAX). The corrosion behaviour of ZnNiP thin films alloys was investigated in two deep eutectic solvent ionic liquids (DES) with different chemical structure at 353K and compared with corrosion in 3.5% NaCl aqueous solution at 273K. The films were characterized by X-ray photoelectron spectroscopy (XPS) to determine their chemical composition in the initial stage and after corrosion. The nature of corrosion morfology has been investigated by and electron microscopy and XPS. The value of the lowest corrosion protection efficiency was of 48.14% and the highest value was of 77.96%. The results confirmed the high corrosion resistance of ZnNiP alloy plated sheet in all ionic liquids systems tested and the results were corelated with corrosion data in aqueous solution. The passive layer consists of Zn and Ni oxides but also of the chemical compounds of nitrogen which were formed on the surface of the ZnNiP thin films during the corrosion process.

Sign in / Sign up

Export Citation Format

Share Document