Effects of Heat Treatments on the Tensile and Corrosion Properties of Zircaloy 2

2009 ◽  
pp. 124-124-20
Author(s):  
J. G. Goodwin ◽  
L. S. Rubenstein ◽  
F. L. Shubert
Keyword(s):  
Heat Treatments ◽  
Corrosion Properties

Effects of Heat Treatments on Corrosion Behavior of Mg AT72 Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 230-237 ◽  
Author(s):  
Zhi Qin Wang ◽  
De Jiang Li ◽  
Xiao Qin Zeng ◽  
Xiao Mei Wu ◽  
Wen Jiang Ding
Keyword(s):  
Heat Treatment ◽  
Hydrogen Evolution ◽  
High Vacuum ◽  
Treatment Method ◽  
Optical Microscope ◽  
Heat Treatments ◽  
Open Circuit ◽  
Second Phase ◽  
Corrosion Properties ◽  
Phase Phase

The effects of heat treatments, including T4, T5, T6 treatments, on corrosion behaviors of Mg-7Al-2Sn (AT72) alloy processed by high vacuum die casting have been investigated. The optical microscope, scanning electron microscope observations were used to analyze the microstructures, especially the distribution of second phase, phase contents and grain size. The hydrogen evolution tests, electrochemical methods including open circuit potential curves and polarization curves were used to describe the corrosion properties as well. The results indicated that different heat treatments had influence on microstructures, especially distribution of second phase, phase contents and grain sizes. The existence of second phase had a relationship with corrosion properties, in which the as-cast samples showed low corrosion rate in hydrogen evolution tests while the heat treatment methods had little impact on improving corrosion resistance. The electrochemical analyses also agreed with this observation. Based on these results, the optimized heat treatment method for corrosion resistant AT72 magnesium alloy has been established.

Microstructural and Corrosion Studies of the Ti-2 Wt % Ni Alloy

1974 ◽  
Vol 32 ◽  
pp. 516-517
Author(s):  
Anna C. Fraker
Keyword(s):  
Random Distribution ◽  
Pure Titanium ◽  
Weight Percent ◽  
Heat Treatments ◽  
Minimum Size ◽  
Corrosion Properties ◽  
Percent Nickel ◽  
Transmission Electron ◽  
Corrosion Studies ◽  
Ni Alloy

The purpose of this paper is to show, using light microscopy and transmission electron microscopy (TEM), the vast differences in precipitate distribution in the Ti-2Ni alloy which result from varying heat treatments in the 500° to 1000°C temperature range. This alloy is of interest because it has a high resistance to crevice corrosion. This resistance is attributed to the presence of the two weight percent nickel and is at a maximum when the Ti2Ni precipitate phase has a minimum size and random distribution. (α-Titanium has a solubility for nickel of <0.2 wt.% so the two percent nickel is in the Ti2Ni phase.) Heat treatments which produce changes in the size and distribution of the Ti2Ni precipitates will affect the corrosion properties of the alloy on a local scale. Sedriks, et al. showed the Ti2Ni phase to have higher anodic polarization currents than pure titanium.

Comparison of Atmospheric Corrosion of Additively Manufactured and Cast Al-10Si-Mg Over a Range of Heat Treatments

CORROSION ◽  
10.5006/3318 ◽  
2019 ◽  
Vol 75 (12) ◽  
pp. 1527-1540 ◽  
Author(s):  
Gregory W. Kubacki ◽  
John P. Brownhill ◽  
Robert G. Kelly
Keyword(s):  
Atmospheric Corrosion ◽  
Treatment Protocol ◽  
Corrosion Damage ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Sample Type ◽  
Corrosion Properties ◽  
Melt Pool ◽  
Corrosion Susceptibility ◽  
Traditional Manufacturing

Additive manufacturing (AM) of metals has gained attention as a technology to rapidly produce complex components while reducing waste generated by traditional manufacturing methods. The corrosion properties of AM alloys are not well understood and merit further exploration. The goal of this study is to compare the atmospheric corrosion susceptibility of printed Al-10Si-Mg alloy to its cast counterpart over a range of heat treatments, including as-produced, T5, and T6 tempers. Atmospheric corrosion testing was performed in a salt-fog chamber using a modified G85-A2 cycle for 31 d. Additionally, potentiodynamic testing was used to assess the kinetics of each sample type in dilute Harrison’s solution. Comparison of corrosion damage revealed that cast and AM samples of similar temper had similar damage frequency and average damage depth, but AM samples had greater maximum depths. In as-built and T5 tempers, the AM samples showed preferential attack of the melt pool boundaries. The corrosion was dominated by a dissolution of Al that appeared to favor a path of least resistance through coarser or more discontinuous regions of the Si network at the melt pool boundary. The heat treatment protocol for the T6 temper removed the melt pool structure and resulted in a more general, and more severe, attack because the Si network was no longer present to impede dissolution. Heat treatments after printing were found to be deleterious to the atmospheric corrosion resistance of AM Al-10Si-Mg alloy.

Effect of Microstructures on Corrosion of X80 Pipeline Steel in an Alkaline Soil

2012 ◽  
Vol 476-478 ◽  
pp. 321-328
Author(s):  
Cong Min Xu ◽  
Rong Biao Li ◽  
Ji Long Wang ◽  
Gang Gang Zhang
Keyword(s):  
Corrosion Product ◽  
Pipeline Steel ◽  
Electrochemical Measurement ◽  
Heat Treatments ◽  
Product Layer ◽  
Alkaline Soil ◽  
Corrosion Properties ◽  
X80 Pipeline Steel ◽  
X80 Steel ◽  
X80 Steels

The influence of microstructures with different heat treatments to stimulate the weld fusion zone and HAZ on corrosion properties of X80 pipeline steel was investigated in alkaline sand soil using electrochemical measurement and surface analysis(SEM, EDS and XRD). The results showed that the microstructure of X80 steel affected the properties of corrosion product layers. Generally, X80 steels with heat treatments had a higher corrosion rate than the as-received steel. The increase of pearlite content enhanced the corrosion of ferrite through a galvanic effect. The appearance of upper bainite and martenite increased further the activity of the steel. The corrosion product layer formed on as-received X80 steel was compact and complete, provided an effective protection to the underneath steel. However, the corrosion product layers on the heat-treated X80 steels were generally inhomogeneous, loose, porous and defective, and provided minor protectiveness. The cathodic/ anodic reactions of X80 steel are dominated by the oxygen reduction and formation of iron oxides that deposit on the steel surface which was through a physical block effect to afford the protection. We shall be able to publish your paper in electronic form on our web page http://www.scientific.net, if the paper format and the margins are correct. Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc.

scholarly journals Effects of hot isostatic pressing and heat treatments on structural and corrosion properties of direct metal laser sintered parts

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mustafa Safa Yılmaz ◽  
Gökhan Özer ◽  
Zafer Çağatay Öter ◽  
Onur Ertuğrul
Keyword(s):  
Corrosion Resistance ◽  
Design Methodology ◽  
Hot Isostatic Pressing ◽  
Heat Treatments ◽  
Corrosion Properties ◽  
Content Type ◽  
Isostatic Pressing ◽  
Direct Laser ◽  
Metal Sintering ◽  
Hip Process

Purpose This paper aims to investigate the effects of various heat treatments on microstructure, hardness, porosity and corrosion properties of the parts. Design/methodology/approach Hot isostatic pressing (HIP) process, various heat treatments and their combinations were applied to the AlSi10Mg parts produced by direct laser metal sintering (DMLS). Findings It has been found that the HIP process, which is a post-processing process, reduces the amount of porosity in DMLS-AlSi10Mg material, thus improves corrosion resistance significantly. Originality/value In this study, the HIP process and subsequent T6 heat treatments were applied to AlSi10Mg parts produced by the DMLS technique. The study aims to increase the corrosion resistance of AlSi10Mg parts by reducing porosity with the HIP process and by altering the microstructure with the T6 process.

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