The Study of Stress Corrosion Crack in Heterogenic Welding Joints under Wet H2S

2011 ◽  
Vol 121-126 ◽  
pp. 3020-3024
Author(s):  
Shu Xu
Keyword(s):  
Corrosion Resistance ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Concentration Increase ◽  
Cracking Behavior ◽  
Maximal Stress ◽  
Welding Joints

Stress corrosion cracking behavior of the six heterogenic welding joints was investigated under the 1300ppm; 2300ppm and saturated H2S concentration by slow strain rate tests and influencing factors of different H2S concentration and welding material are analyzed to the stress corrosion cracking. It is showed that stress corrosion cracking is more sensitive above 1300ppm H2S concentration. With the H2S concentration increase, the maximal stress, elongation and the time of rapture decrease on heterogenic welding joints 1Cr9Mo/45 and 0Cr18Ni9/1Cr9Mo. But they are not influenced to the joint 0Cr18Ni9/45. It is also concluded that replacement of A302 by Inconel182 can improve the corrosion resistance of 1Cr9Mo/45 but can not make any influence on the joints 0Cr18Ni9/45 and 0Cr18Ni9/1Cr9Mo

Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

2019 ◽  
Vol 234 (8) ◽  
pp. 1640-1652 ◽  
Author(s):  
Xiuli He ◽  
Hongyu Liang ◽  
Zhifeng Yan ◽  
Rui Bai
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Az31 Alloy ◽  
Corrosion Cracking ◽  
Nacl Solution ◽  
Cracking Behavior ◽  
Good Corrosion Resistance ◽  
Mixed Fracture

The stress corrosion cracking behaviors of micro-arc oxidized AZ31 magnesium alloy were studied by using the slow tensile test in air and 3.5 wt.% NaCl solution. Results showed that compared with the substrate, the stress corrosion cracking susceptibility of the micro-arc oxidized specimens was obvious improved apparently in 3.5 wt.% NaCl solution, due to the good corrosion resistance of the specimens after micro-arc oxidized coating treatment. In addition, regardless of the micro-arc oxidized treatment, it was the mixed fracture in air and the cleavage fracture in 3.5 wt.% NaCl solution. The micro-arc oxidized coating had no direct effect on the fracture mechanism of the alloy. It was closely related to the nature of the material and the environment of the material servicing.

Effect of non-conventional heat treatment of API X60 pipeline steel on corrosion resistance and stress corrosion cracking susceptibility

2019 ◽  
Vol 66 (3) ◽  
pp. 274-285 ◽  
Author(s):  
Luis Ricardo Jacobo ◽  
Rafael Garcia ◽  
Victor Hugo Lopez ◽  
Antonio Contreras
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Activation Process ◽  
Content Type ◽  
Heat Treated ◽  
Conventional Heat Treatment

Purpose The purpose of this paper is to study the effect of heat treatment (HT) applied to an API X60 steel in corrosion resistance and stress corrosion cracking (SCC) susceptibility through slow strain rate tests (SSRT) in NS4 solution and congenital water (CW) to assess external and internal SCC, respectively. Design/methodology/approach API X60 steel was heat treated at a temperature of 1,200°C for 30 min followed by water quenching. Specimens from this steel were machined according to NACE TM 198. SSRT were performed in a constant extension rate tests (CERT) machine at room temperature at a strain rate of 1 × 10–6 s–1. For this purpose, a glass cell was used. Corrosion behavior was evaluated through polarization curves (PCs). Findings The SCC index obtained from SSRT indicates that the steel heat treated could be susceptible to SCC in CW and NS4 solution; the mechanism of SCC was hydrogen embrittlement. Thus, CW may promote the SCC phenomenon in pipelines. HT improves the steel corrosion resistance. Higher corrosion rate (CR) was observed when the steel is exposed to CW. The corrosion process in X60 steel shows that the oxidation reaction in the anodic branch corresponds to an activation process, and the cathode branches reveal a diffusion process. Originality/value The purpose of the heat treatment applied to X60 steel was to generate a microstructure of acicular ferrite to improve the corrosion resistance and SCC behavior.

scholarly journals Stress Corrosion Cracking Behavior of Fine-Grained Al5083 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7608
Author(s):  
Asiful H. Seikh ◽  
Muneer Baig ◽  
Ateekh Ur Rehman ◽  
Faraz H. Hashmi ◽  
Jabair A. Mohammed
Keyword(s):  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Testing Machine ◽  
Corrosion Cracking ◽  
High Density ◽  
Ebsd Analysis ◽  
Tensile Testing Machine ◽  
Cracking Behavior ◽  
Fine Grained

In the present study, the stress corrosion cracking (SCC) behavior of ECAP Al5083 alloy was investigated in air as well as in 3.5 % NaCl solution using the slow strain rate tensile test (SSRT). The characteristics of grain boundary precipitates (GBPs), specifically the microchemistry of the SCC behavior of Al5083 alloys, both in “as-received” condition and when deformed by the ECAP process, were examined. The correlations between the SCC resistance and GBP microchemistry were examined. A microstructural evaluation was performed using an optical microscope. SCC tests were carried out using a universal tensile testing machine and the fracture surfaces were studied using scanning electron microscopy (SEM). A strain rate of 1×10−6 s−1 was applied for the SSRT. As the passes increased, the SCC susceptibility of the fine-grained ECAP Al5083 alloy also increased. Moreover, higher ultimate tensile strength and greater elongation were observed. This was due to grain refinement, high-density separations, and the expanded extent of high-density dislocations instigated by severe plastic deformation. Due to the high strength and elongation, the failure analysis showed a ductile mode of fracture. Electron backscattering diffraction (EBSD) analysis was performed to determine more clearly the nature of cracking. EBSD analysis showed that the crack propagation occurred in both transgranular and intergranular modes.

Degradation, stress corrosion cracking behavior and cytocompatibility of high strain rate rolled Mg-Zn-Sr alloys

2020 ◽  
Vol 260 ◽  
pp. 126920
Author(s):  
Zonglin Yu ◽  
Jihua Chen ◽  
Hongge Yan ◽  
Weijun Xia ◽  
Bin Su ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strain ◽  
Corrosion Cracking ◽  
Cracking Behavior
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