Microstructural characterisation of a dissimilar weld of alloy D9 and AISI 316M stainless steel produced using a 2.5 kW CW CO 2 laser

2002 ◽  
Vol 12 (2) ◽  
pp. 117-133 ◽  
Author(s):  
Rakesh Kaul ◽  
P. Ganesh ◽  
M.O. Ittoop ◽  
A.K. Nath ◽  
Aniruddha Kumar ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Dissimilar Weld ◽  
Microstructural Characterisation ◽  
Alloy D9

Experimental investigation on dissimilar weld between super duplex stainless steel 2507 and API X70 pipeline steel

2021 ◽  
pp. 146442072110130
Author(s):  
Waris N Khan ◽  
Rahul Chhibber
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Pipeline Steel ◽  
High Strength ◽  
Super Duplex Stainless Steel ◽  
Shielded Metal Arc Welding ◽  
Electrode Coating ◽  
Dissimilar Weld ◽  
Metal Arc Welding ◽  
Welding Electrode

This work investigates the microstructure and mechanical properties of 2507 super duplex stainless steel and API X70 high strength low alloy steel weld joint. This joint finds application in offshore hydrocarbon drilling riser and oil–gas pipelines. Coated shielded metal arc welding electrodes have been designed and extruded on 309L filler and their performance compared with a commercial austenitic electrode E309L. Filler 309L solidifies in ferrite-austenite (F-A) mode with a resultant microstructure comprising skeletal ferrites with austenite distributed in the interdendritic region. Results of tensile and impact tests indicate that weld fabricated with laboratory-developed electrodes has higher ductility and impact energy than the commercial electrode. The tensile strength and weld hardness of commercial electrodes are superior. The laboratory-made electrode’s microhardness is lower than the commercial electrodes, making the former less prone to failure. An alternative welding electrode coating composition has been suggested through this work and found to be performing satisfactorily and comparable to the commercially available electrodes.

scholarly journals Evaluation of Microstructure and Impact Toughness of Shielded Metal Arc Dissimilar Weldments of High Strength Low Alloy Steel and Austenitic Stainless Steel

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Misbahu A Hayatu ◽  
Emmanuel T Dauda ◽  
Ola Aponbiede ◽  
Kamilu A Bello ◽  
Umma Abdullahi
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Impact Toughness ◽  
Impact Energy ◽  
High Strength ◽  
Impact Testing ◽  
Welding Parameters ◽  
Dissimilar Weld ◽  
Weld Joints ◽  
The Impact

There is a growing interest for novel materials of dissimilar metals due to higher requirements needed for some critical engineering applications. In this research, different dissimilar weld joints of high strength low alloy (HSLA) and 316 austenitic stainless steel grades were successfully produced using shielded metal arc welding (SMAW) process with 316L-16 and E7018 electrodes. Five variations of welding currents were employed within the specified range of each electrode. Other welding parameters such as heat inputs, welding speeds, weld sizes, arc voltages and time of welding were also varied. Specimens for different weld joint samples were subjected to microstructural studies using optical and scanning electron microscopes. The impact toughness test was also conducted on the samples using Izod impact testing machine. The analysis of the weld microstructures indicated the presence of type A and AF solidification patterns of austenitic stainless steels. The results further showed that the weld joints consolidated with E7018 electrode presented comparatively superior impact energy to the weldments fabricated by 316L-16 electrode. The optimum impact energy of E7018-weld joints (51J) was attained at higher welding heat inputs while that of 316L-16-weld joints (35J) was achieved at lower welding heat inputs, which are necessary requirements for the two electrodes used in the experiment. Hence, the dissimilar weld joints investigated could meet requirement for engineering application in offshore and other critical environments.Keywords—Dissimilar metal weld, heat input, impact toughness, microstructures

Cracking behavior in a dissimilar weld between high silicon nodular cast iron and ferritic stainless steel

2010 ◽  
Vol 16 (3) ◽  
pp. 483-488 ◽  
Author(s):  
Sanghoon Kim ◽  
Sangchul Lee ◽  
Kyutae Han ◽  
Seunggab Hong ◽  
Changhee Lee
Keyword(s):  
Stainless Steel ◽  
Cast Iron ◽  
Ferritic Stainless Steel ◽  
Nodular Cast Iron ◽  
Cracking Behavior ◽  
Dissimilar Weld ◽  
High Silicon

scholarly journals Investigation on microstructure and tensile properties of dissimilar weld joints between AISI 316l and duplex 2205 stainless steel

2018 ◽  
Vol 402 ◽  
pp. 012075
Author(s):  
Dhananjay Parashar Tumu ◽  
P Subramani ◽  
K Gokul Kumar ◽  
M Manikandan ◽  
C G Mohan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
Aisi 316L ◽  
Dissimilar Weld ◽  
Weld Joints

Correlation between microstructural gradient and microindentation properties of dissimilar weld between INCONEL 625 and Duplex Stainless Steel

2020 ◽  
Vol 117 (4) ◽  
pp. 407
Author(s):  
Ammar Chabbi ◽  
Mabrouk Bouabdallah ◽  
Sergio Sao-Joao ◽  
Achraf Boudiaf ◽  
Guillaume Kermouche
Keyword(s):  
Stainless Steel ◽  
Elastic Modulus ◽  
Weld Metal ◽  
Duplex Stainless Steel ◽  
Heat Affected Zone ◽  
Laves Phase ◽  
Inconel 625 ◽  
Secondary Phases ◽  
Dissimilar Weld ◽  
Scanning Electron

Microstructure evolution and microindentation properties of dissimilar weld between Inconel 625 nickel based alloy and UNS S32205 Duplex Stainless Steel have been investigated in the current study. Samples in cross-section areas were prepared to investigate microstructure and micromechanical properties in different regions of weld using optical microscopy, scanning electron microscopy and indentation measurements. Typical solidification microstructures were observed. Secondary phases were noticed in both the weld metal and heat affected zone of Inconel 625 alloy at cellular and interdendritic region in lamellar, rod shaped and cuboidal form. These secondary phases were identified as Laves phase and carbonitrides of Nb and Ti. Mechanical properties including elastic modulus and hardness were estimated across the weld joint. The results showed that the weld metal exhibit the lowest values of hardness and elastic modulus, however the Heat Affected Zone of the stainless steel exhibit the highest values owing to high δ-ferrite amount. In-situ nanoindentation coupled with Scanning Electron Microscope was carried out in Laves phase and the matrix weld in order to evaluate nanohardness. The result showed that the nanohardness of Laves phase is too great compared to the weld matrix.

Dynamic Recrystallisation during Isothermal Hot Deformation in a Titanium Modified Austenitic Stainless Steel

2012 ◽  
Vol 715-716 ◽  
pp. 140-145 ◽  
Author(s):  
Sumantra Mandal ◽  
A.K. Bhaduri ◽  
Baldev Raj ◽  
V. Subramanya Sarma
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Constant Strain Rate ◽  
Compression Tests ◽  
Grain Rotation ◽  
Grain Structures ◽  
Annealing Twins ◽  
Σ3 Boundary ◽  
Dynamic Recrystallisation ◽  
Alloy D9

The paper discusses the microstructural evolution during dynamic recrystallisation (DRX) of a titanium-modified austenitic stainless steel (alloy D9). Isothermal hot compression tests were conducted in a Gleeble thermo-mechanical simulator in the temperature range 1173-1373K to various strains at a constant strain rate of 0.1 and 1 s-1. The extent of DRX increased with increase in strain and temperature. Nucleation of new DRX grains was found to occur by bulging of parent grain boundary. A continuous sub-grain rotation around the original grain boundaries, which would lead to the formation of DRX nucleus in sub-grain structures, could not be confirmed from the present study. Fractions of Σ3 boundaries increased almost linearly with increase in area fraction of DRX. The generation of this Σ3 boundary was accounted for in the formation of annealing twins during DRX. The possible role of annealing twins on DRX in alloy D9 is also discussed.

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