scholarly journals The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 870
Author(s):  
Fei Xue ◽  
Fangjie Shi ◽  
Chuangju Zhang ◽  
Qiaoling Zheng ◽  
Dawei Yi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Aging Time ◽  
Thermal Aging ◽  
Great Influence ◽  
Fracture Mechanisms ◽  
Rich Phase ◽  
Corrosion Behaviors ◽  
The Impact ◽  
Cast Stainless Steel

The effects of thermal aging time at 400 °C on the microstructure and mechanical and corrosion behaviors of Z3CN20.09M cast stainless steel were investigated; and the corresponding thermal aging mechanism was studied. It was revealed that the changes in mechanical properties after thermal aging were mainly caused by the iron-rich phase (α) and the chromium-rich phase (α’) produced by the amplitude-modulation decomposition of ferrite. A similar trend of thermoelectric potential during thermal aging was determined in relation to the Charpy impact energy. However, the corrosion resistance of Z3CN20.09M cast stainless steel deteriorates as thermal aging time increases. When the thermal aging is longer than 3000 h, the precipitation of G phase has a great influence on the corrosion resistance. The interfacial matching relationship between G phase and the surrounding ferrite was established by selected area electron diffraction of HRTEM. The relationship is of cube-on-cube phase boundary type. The impact fracture mechanisms in relation to thermal aging time were also studied and compared.

Thermal Aging of Cast Stainless Steel, and Its Impact on Piping Integrity

1985 ◽  
Vol 107 (1) ◽  
pp. 53-60 ◽  
Author(s):  
W. H. Bamford ◽  
E. I. Landerman ◽  
E. Diaz
Keyword(s):  
Stainless Steel ◽  
Failure Mode ◽  
Thermal Aging ◽  
Charpy Impact ◽  
J Integral ◽  
Duplex Structure ◽  
Test Program ◽  
Series Of Experiments ◽  
The Impact ◽  
Cast Stainless Steel

A series of experiments were conducted to characterize the effects of high temperature service (550–650°F or 288–343°C) on the mechanical properties of cast stainless steels. The material studied was Type 316 CF8M stainless steel, which has a duplex structure consisting of ferrite and austenite. Recent studies have shown that thermal aging can result in substantial changes in the Charpy impact energy of this material, and this study was designed to further investigate this finding, and to determine what the impact of this phenomenon might be on the failure mode of piping made of it. To do this one heat of material was furnace aged and tested to determine tensile, Charpy and J-integral R curve properties. To investigate the failure mode of thermally aged piping, entire sections of this heat of four inch (10.2 cm) schedule 80 cast piping were aged and tested to failure after the introduction of large flaws. The results of the test program showed excellent agreement with analytical predictions.

Effects of Aging Precipitates on the Mechanical and Corrosion Resistance Properties of 18Cr-18Mn-2Mo-0.96N Super High Nitrogen Austenitic Stainless Steel

2013 ◽  
Vol 395-396 ◽  
pp. 284-288 ◽  
Author(s):  
Zu Rui Zhang ◽  
Zhen Ye Zhao ◽  
Chun Zhi Li ◽  
Zhou Hua Jiang ◽  
Hua Bing Li
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Aging Time ◽  
Volume Fraction ◽  
Charpy Impact ◽  
Optical Microscope ◽  
High Nitrogen ◽  
Effects Of Aging ◽  
The Impact

This paper investigates the effects of aging precipitates on the mechanical and corrosion resistance properties of 18Cr-18Mn-2Mo-0.96N super high nitrogen austenitic stainless steel (HNS) through Vickers hardness, Charpy impact, tensile and electrical chemical methods. The probable affected mechanism is discussed by optical microscope (OM) and transmission electron microscopy (TEM). The results are presented as follow: the initial TTP curve with 0.05% precipitates volume fraction presents C type which has a nose temperature at 850°C with an incubation period for 60s. The precipitates increase with prolonging aging time to 40%. The HV results of aged HNS present firstly decrease then increase, the relevant yield strength firstly increase then decrease with increasing the aging time. Meanwhile, the impact energy, ultimate tensile strength and elongation are deteriorated significantly because of the formation and growth of cellular Cr2N and χ phase with concomitant increased amount of intergranular Cr2N. The IGC susceptibility increases and the pitting corrosion potentials decrease because of the Cr, N and Mo depletion through the formation of intergranular, cellular Cr2N and intermetallic χ precipitates by aging treatments.

scholarly journals Susceptibility to Stress Corrosion of Laser-Welded Composite Arch Wire in Acid Artificial Saliva

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Chao Zhang ◽  
Xinhua Sun
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Shape Memory Alloy ◽  
Artificial Saliva ◽  
Steel Wire ◽  
Niti Shape Memory Alloy ◽  
Solution Ph ◽  
Corrosion Behaviors ◽  
Cu Interlayer

The corrosion resistance of laser-welded composite arch wire (CoAW) with Cu interlayer between NiTi shape memory alloy and stainless steel wire in artificial saliva with different acidities and loads was studied. It was found that both the solution pH and the stress had a significant influence on the corrosion behaviors of the CoAW samples. Decreasing the solution pH or increasing the loading stress caused the increase of Cu release and weight loss. The corroded morphology formed on the surfaces of the CoAW was the consequence under the combined effect of corrosion and stress.

Microstructure and Corrosion Resistance of HVOF Sprayed 316L Stainless Steel and Ni Base Alloy Coatings

2000 ◽  
Author(s):  
S. Kuroda ◽  
T. Fukushima ◽  
T. Kodama ◽  
M. Sasaki
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Sea Water ◽  
Base Alloy ◽  
Standard Condition ◽  
Polarization Measurement ◽  
Superior Corrosion Resistance ◽  
Distribution Composition ◽  
The Impact

Abstract 316L stainless steel and Hastelloy C alloy powders were sprayed by an HVOF apparatus onto mild steel substrates. The microstructure, pore size distribution, composition and corrosion resistance of thus obtained coatings were evaluated experimentally. Corrosion resistance in sea-water was examined by monitoring the impedance and corrosion potential of samples immersed in artificial sea-water at 300 K over a period of more than 3 months and also by polarization measurement. It was found that the stainless coatings composed mainly of plastically deformed particles and some splats which were molten at the impact. By increasing the combustion pressure, the porosity as measured by mercury porosimeter could be reduced to below 1%. In comparison, Hastelloy C deposits sprayed under the standard condition were so dense that its porosity could not be measured by the porosimeter. The polarization curve and the results of impedance monitoring both exemplified that the Hastelloy C coatings possess much superior corrosion resistance to the stainless coatings in sea-water, which was attributed to the higher density and better adhesion of the Ni-base alloy coatings.

Fracture Toughness of Z3CN20.09M Cast Stainless Steel with Long-Term Thermal Aging

2017 ◽  
Vol 26 (9) ◽  
pp. 4442-4449 ◽  
Author(s):  
Weiwei Yu ◽  
Dunji Yu ◽  
Hongbo Gao ◽  
Fei Xue ◽  
Xu Chen
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Thermal Aging ◽  
Cast Stainless Steel

scholarly journals Rare Earth Cerium Increases the Corrosion Resistance of NdFeB Magnets

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4360
Author(s):  
Jialei Dai ◽  
Zixuan Yang ◽  
Qian Liu
Keyword(s):  
Corrosion Resistance ◽  
Metal Matrix ◽  
Kelvin Probe ◽  
Rich Phase ◽  
Impact Mechanism ◽  
Ndfeb Magnets ◽  
Electrochemical Tests ◽  
Force Microscopy ◽  
The Impact ◽  
Ce Content

Herein, we investigated the effects of Ce on the corrosion behavior of NdFeB magnets in 3.5% NaCl solutions using electrochemical tests, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) mapping, and scanning Kelvin probe force microscopy (SKPFM). We demonstrated that Ce markedly enhances the corrosion resistance of NdFeB magnets. Ce primarily replaces Nd in the Nd-rich phase instead of matrix phase, increasing the surface potential of the Nd-rich phase. An increase in the Ce content from 0 to 5.21 wt%, decreased the potential difference between the main phase and (Nd, Ce)-rich phase from 350.2 mV to 97.7 mV; therefore, the corrosion resistance of the magnetic materials increased. The corrosion resistance constituted the Nd-rich phase < the void < metal matrix. Moreover, based on the results of the study, we discussed the impact mechanism of additions of Ce on the corrosion resistance of the magnets.

Effects of thermal aging on the fracture toughness of cast stainless steel CF8

2019 ◽  
Vol 173 ◽  
pp. 45-54 ◽  
Author(s):  
David A. Collins ◽  
Emily L. Barkley ◽  
Timothy G. Lach ◽  
Thak Sang Byun
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Thermal Aging ◽  
Cast Stainless Steel

scholarly journals Study on a Superhydrophobic Stainless Steel (SUS 304) Surface to Enhance Corrosion Resistance

2021 ◽  
Vol 59 (4) ◽  
pp. 217-222
Author(s):  
Youngju Park ◽  
Chanyoung Jeong
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Nuclear Power ◽  
Water Repellency ◽  
Industrial Applications ◽  
Surface Shape ◽  
Water Repellent ◽  
Anode Electrode ◽  
Corrosion Behaviors ◽  
Electronic Parts

Stainless steel is a metal with excellent workability, economy, and corrosion resistance, so it is used in various industrial applications including the marine, machinery, electronic parts, piping, power generation, and nuclear power fields. However, in contaminated environments such as marine and gas pipelines, stainless steel has problems, including surface aging and corrosion. Several surface treatment methods have been proposed to address those problems. This study was conducted to observe the water repellency and corrosion resistance of a superhydrophobic phosphorylated film on the surface of stainless steel. The anodization was carried out using a step-by-step process under voltage in an ethylene glycol electrolyte, at 30, 50, and 70 V for 3 hours, respectively. The distance between the anode electrode and cathode electrode was maintained at 5 cm. A water-repellent surface was achieved using a FDTS (1H, 1H, 2H, 2H-Perfluorodecyltrichlorosilane) solution, a material with low energy, on the surface of the fabricated specimen. A Field Emission Scanning Electron Microscope (FE-SEM) was used to analyze the surface shape of the structure, and water repellency was analyzed using an angle meter. The corrosion behaviors of the electrochemical oxide film were investigated through polarization experiments.

scholarly journals Effect of Carbon Content and Elements Mo and V on the Microstructure and Properties of Stainless Steel Powder Surfacing Layer

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 371
Author(s):  
Taixu Xu ◽  
Chongyi Wei ◽  
Xiao Han ◽  
Jihui Liu ◽  
Zhijun He ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Impact Toughness ◽  
Carbon Content ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
Low Grade ◽  
Microstructure And Properties ◽  
The Impact

This study evaluated the effect of an increase in carbon content and the presence of the elements Mo and V on the microstructure and properties of the surfacing layer of stainless steel powder for knives and scissors production. Various types of high-quality stainless steel powder (5Cr13, 8Cr13, and 8Cr13MoV) were deposited on the surface of low-grade stainless steel used to produce knives and scissors (2Cr13). The microstructure, comprehensive hardness, wear resistance, impact toughness, and corrosion resistance of the stainless steel powder surfacing layers were tested and analyzed. Results indicate that the increase in carbon content and the presence of Mo and V improve the comprehensive hardness and wear resistance of the stainless steel powder surfacing layer, and both exert the superposition effect. However, the increase in carbon content and the presence of Mo and V slightly influence the impact toughness of the surfacing layer. In addition, the increase in carbon content significantly reduces the corrosion resistance of the surfacing layer. This adverse effect is reduced when Mo and V exist. Other advantages of the presence of Mo and V in the stainless steel powder surfacing layer include the refinement of grain size, reduction of carbide particle size, and improvement of the metallurgical bonding of the surfacing layer and the matrix.

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