Experimental investigation on Ytterbium fiber laser butt welding of Inconel 625 and Duplex stainless steel 2205 thin sheets

In the present investigation, thin sheets of stabilized and unstabilized ferritic stainless steel were welded in butt joint configuration using irradiation of a 1070 nm fiber-laser. Using optical microscopy, the microstructural evolution upon alternating heat input was characterized. In addition to that, hardness and tensile tests were carried out on the specimens. Detailed focus was given to the intergranular corrosion properties, which were investigated on basis of the Strauss test with different times of exposure to the corrosive environment. Following these tests, the mechanical properties of the joints were characterized using tensile tests. A combination of the latter with an inspection by μ-CT analysis allows for the proposition of an intergranular corrosion rate with regard to the degradation of the joint strength.

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Influence of absorbed nitrogen on microstructure and corrosion resistance of 2205 duplex stainless steel joint processed by fiber laser welding

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2016.01.016 ◽

2016 ◽

Vol 231 ◽

pp. 397-405 ◽

Cited By ~ 28

Author(s):

Rui Lai ◽

Yan Cai ◽

Yue Wu ◽

Fang Li ◽

Xueming Hua

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Laser Welding ◽

Fiber Laser ◽

Duplex Stainless Steel ◽

Fiber Laser Welding ◽

2205 Duplex Stainless Steel ◽

Steel Joint

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

Metallurgical Research & Technology ◽

10.1051/metal/2020035 ◽

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.

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