Influence of Thermal Aging on the Mechanical and Corrosion Properties of GTAW Welds of Alloy N06022

2002 ◽  
Vol 713 ◽  
Author(s):  
Tammy S. Edgecumbe Summers ◽  
Raúl B. Rebak ◽  
Todd A. Palmer ◽  
Paul Crook
Keyword(s):  
Volume Fraction ◽  
Charpy Impact ◽  
Corrosion Properties ◽  
Charpy Impact Toughness ◽  
Gas Tungsten Arc ◽  
Hydrochloric Acid Solutions ◽  
Tcp Phase ◽  
Mechanical And Corrosion Properties ◽  
Gas Tungsten Arc Welds ◽  
Kinetics Of

ABSTRACTThe phase stability of C-22 alloy (UNS N06022) gas tungsten arc welds was studied by aging samples at 593, 649, 704, and 760°C for times up to 6,000 hours. The tensile properties and the Charpy impact toughness of these samples were measured in the as-welded condition as well as after aging. The corrosion resistance was measured using standard immersion tests in acidic ferric sulfate (ASTM G 28 A) and 2.5% hydrochloric acid solutions at the boiling point. The microstructures of weld samples were examined using scanning electron microscopy (SEM). Precipitate volume fraction measurements were made using optical microscopy.Degradation of the mechanical and corrosion properties of C-22 welds due to aging at all temperatures investigated was seen to occur sooner than was seen in C-22 base metal. An evaluation of the kinetics of nucleation and growth of the precipitates forming at these temperatures, however, indicated that no significant changes in TCP phase morphology would occur at temperatures below approximately 300°C.a

Microstructure, Mechanical and Corrosion Properties of UNS 32205 Duplex Stainless Steel Weldment Joints by Multipass FCAW

2021 ◽  
Vol 58 (6) ◽  
pp. 332-353
Author(s):  
A. Kisasoz ◽  
M. Tümer ◽  
A. Karaaslan
Keyword(s):  
Arc Welding ◽  
Weld Seam ◽  
Electrochemical Corrosion ◽  
Charpy Impact ◽  
Corrosion Properties ◽  
Cored Wire ◽  
Weld Joints ◽  
Flux Cored Arc Welding ◽  
Mechanical And Corrosion Properties ◽  
Stainless Steel Weldment

Abstract In this study, the effect of multipass welding on the microstructure, mechanical and corrosion properties of the UNS 32205 duplex stainless steels (DSS) is investigated. The UNS 32205 DSS is welded in 3 or 7 passes by flux-cored arc welding (FCAW) using E2209 T1 – 1/4 flux cored wire. The weldments are characterized by light optical microscopy (LOM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Feritscope analysis, Charpy impact tests and electrochemical corrosion tests. The results suggest that the multipass FCAW process induces the formation of γ2 in the weld seam. The mechanical and the corrosion properties of the weld joints are affected by the heat input variation and the phase transformations. Especially, the formation of the γ2 in the weld seam results in a decrease in the corrosion resistance of the joint samples.

Influence of Filler Materials on Mechanical and Hot Corrosion Properties of Gas Tungsten Arc Welded AISI 304

2012 ◽  
Vol 185 ◽  
pp. 113-115 ◽  
Author(s):  
R. Mohanraj ◽  
Kumar D. Rajesh ◽  
Kumar M. Yeswanth ◽  
N. Arivazhagan ◽  
Ramkumar K. Devendranath ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Comparative Analysis ◽  
Filler Materials ◽  
Air Oxidation ◽  
Corrosion Properties ◽  
Aisi 304 ◽  
Edax Analysis ◽  
Gas Tungsten Arc ◽  
Mechanical And Corrosion Properties

This paper investigated the influence of filler materials such as E308L and ENiCu-7 utilized in the GTA welded AISI 304 with respect to mechanical and corrosion properties. It was found that E308L had shown better tensile strength and corrosion resistance as compared to ENiCu-7. A comparative analysis had been made on the different regions of the weldment subjected to cyclic air oxidation at 700°C. The corrosion products were examined using XRD and SEM/EDAX analysis.

Microstructure, mechanical and corrosion properties of TIG welded Hastelloy C-276

2020 ◽  
Vol 62 (9) ◽  
pp. 883-887
Author(s):  
Mustafa Tümer
Keyword(s):  
Weld Metal ◽  
Potentiodynamic Polarization ◽  
Base Material ◽  
Corrosion Properties ◽  
Gas Tungsten Arc ◽  
Industrial Alloy ◽  
Weld Metal Microstructure ◽  
Mechanical And Corrosion Properties ◽  
Metal Microstructure ◽  
The Impact

Abstract Hastelloy C-276 is a corrosion resistant nickel based solid solution hardened industrial alloy which has superior mechanical and corrosion properties. In this study, Hastelloy C-276 alloy was welded via the GTAW (Gas tungsten arc welding) method using ERNiCrMo-4 filler metal. Tensile, bending and notch impact tests were performed to determine the mechanical properties. The microstructure of the weld metal was investigated by light microscopy (LM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The impact toughness values of the heat affected zone (HAZ) showed a better performance than those of the weld metal. In addition, the corrosion properties of the weld metal and the base material were investigated by potentiodynamic polarization tests. Electrochemical potentiodynamic polarization parameters were determined according to corrosion behavior and microstructure properties. In particular, the corrosion rate of the weld metal increased because of the Mo-rich phases deposited in the weld metal microstructure.

scholarly journals Microstructure, Mechanical and Corrosion Properties of Mg-Gd-Zn Alloys

2013 ◽  
Vol 765 ◽  
pp. 28-32 ◽  
Author(s):  
Amirthalingam Srinivasan ◽  
Yuan Ding Huang ◽  
Chamini Lakshi Mendis ◽  
Hajo Dieringa ◽  
Carsten Blawert ◽  
...  
Keyword(s):  
Volume Fraction ◽  
High Volume ◽  
Dynamic Precipitation ◽  
Corrosion Properties ◽  
Corrosion Studies ◽  
Zn Content ◽  
The Matrix ◽  
Elongation To Failure ◽  
Mechanical And Corrosion Properties ◽  
Cast Condition

Microstructure, mechanical and corrosion properties of Mg-10Gd-2Zn and Mg-10Gd-6Zn (all in wt.%) were evaluated in the as-cast condition. The microstructures of both alloys contained (Mg, Zn)3Gd phase at the interdendritic regions and long period stacking ordered (LPSO) phase distributed in the matrix. The Mg-10Gd-6Zn alloy consisted of a high volume fraction of (Mg,Zn)3Gd intermetallic phases continuously distributed along the grain boundaries. The tensile properties, especially the elongation to failure of the Mg-10Gd-6Zn alloy were slightly lower than those of Mg-10Gd-2Zn. An enhancement in creep resistance was observed with Mg-10Gd-2Zn alloy with the post creep tested microstructure showing dynamic precipitation. Corrosion studies indicated that increased Zn content, from 2 to 6 % in Mg-10Gd alloys, significantly reduced the corrosion resistance.

Evaluation of Mechanical and Corrosion Properties of Base Metal and HAZ Having ASS 304L Forgings Containing Ferrite

2020 ◽  
Author(s):  
Ritesh Patel ◽  
Hardik Shah ◽  
Jimmy Dutt
Keyword(s):  
Base Metal ◽  
Hardness Test ◽  
Mechanical Tests ◽  
Delta Ferrite ◽  
Corrosion Properties ◽  
Gas Tungsten Arc ◽  
Significant Difference ◽  
Gtaw Process ◽  
Microstructure Examination ◽  
Mechanical And Corrosion Properties

Abstract Austenitic Stainless Steel type 304L is being widely used for fabrication due to excellent corrosion resistance and good weldability. Ferrite (3–10%) is needed in weld metal to prevent hot cracking during welding, however, base metal should preferably not contain any ferrite. It is observed that thick forged SS304L components may have small percentage of ferrite depending on the chemical composition, forging parameters including intermediate soaking cycle and final solution annealing heat treatment cycle. Little study or information is available on effect of ferrite in base metal on weld/Heat Affected Zone (HAZ) properties. Present study is aimed to evaluate mechanical and corrosion properties of weldment produced with base metal containing 2–4% of ferrite. Forged tubes with two different levels of delta ferrite, with < 0.5% & 2–4%, were welded to Plates with < 0.5% delta ferrite using Mechanized Gas Tungsten Arc Welding (GTAW) process with Inner Bore Welding Technique. Tensile test, Impact test and Hardness test were performed on base metal & HAZ in as-welded condition for both the cases. Microstructure examination in HAZ and Intergranular Corrosion (IGC) test were also performed for both the cases. Results of mechanical tests, microstructure examination and IGC test have been compared between base metal/HAZ of < 0.5% and 2–4% Ferrite base metal. No significant difference has been observed in test result of tubes with 2–4% delta ferrite as compared to tubes with < 0.5% delta ferrite.

scholarly journals Influence of Different Soaking Times at 1050 °C on the UT Response Due to Microstructure Evolution of 2205 Duplex Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 503
Author(s):  
Andrea Gruttadauria ◽  
Silvia Barella ◽  
Carlo Mapelli ◽  
Davide Mombelli
Keyword(s):  
Stainless Steel ◽  
Thermal Treatment ◽  
Duplex Stainless Steel ◽  
Energy Absorption ◽  
Microstructure Evolution ◽  
Wave Scattering ◽  
Volume Fraction ◽  
Thermal Treatments ◽  
Corrosion Properties ◽  
Mechanical And Corrosion Properties

Under standard conditions, DSS (duplex stainless steel) features differing amounts of ferrite and austenite, essentially depending on the thermal treatment performed. This study is focused on the ultrasonic tests (UTs) response of DSS 2205, as a function of the microstructure, in terms of austenite volume fraction and austenitic grains evolution owing to different soaking times at 1050 °C. UTs were carried out on several samples. The samples underwent varying thermal treatments characterized by a constant maintenance temperature with different soaking times that allowed for microstructure evolution and modification of the structural constituents’ fraction. The UTs have highlighted an attenuation trend with the response mainly dependent upon the wave scattering and energy absorption caused by the grain features. In particular, the peak of sound attenuation was shown to correspond with the microstructure, which featured a major amount of austenite (in terms of volume fraction and the grain dimensions) and the disappearance of austenitic precipitates within the ferritic matrix. In order to obtain less UT attenuation, without affecting the mechanical and corrosion properties, the soaking should last as little time as possible.

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