scholarly journals Microstructure and Microsegregation of an Inconel 625 Weld Overlay Produced on Steel Pipes by the Cold Metal Transfer Technique

2014 ◽  
Vol 59 (3) ◽  
pp. 1081-1084 ◽  
Author(s):  
M. Rozmus-Górnikowska ◽  
Ł. Cieniek ◽  
M. Blicharski ◽  
J. Kusiński
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Pearlitic Steel ◽  
Metal Transfer ◽  
Inconel 625 ◽  
Cold Metal Transfer ◽  
Weld Overlay ◽  
Steel Pipes ◽  
Cold Metal ◽  
Weld Overlays

Abstract The aim of this work was to investigate the development of microstructure and variations in chemical composition in commercial Inconel 625 coatings on a ferritic-pearlitic steel overlaid by the CMT method.The investigation showed that microsegregation occurring during the weld overlay solidification makes the dendrite cores to be richer in Ni, Fe and Cr and in the between dendrite arms in Mo and Nb. Niobium shows the strongest tendency to segregation during solidification; molybdenum tends to segregate less and chromium has the lowest tendency to segregation. Although Inconel 625 is a solid solution strengthened alloy, Nb and Mo-rich phases are formed in the between dendrite arms of weld overlays.

scholarly journals Corrosion Resistance of Inconel 625 CMT-Cladded Layers after Long-Term Exposure to Biomass and Waste Ashes in High-Temperature Conversion Processes

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4374
Author(s):  
Aleksandra Błoniarz ◽  
Marcus Schreiner ◽  
Markus Reinmöller ◽  
Agnieszka Kopia
Keyword(s):  
Chemical Composition ◽  
Inconel 625 ◽  
X Rays ◽  
X Ray Diffraction ◽  
Cold Metal Transfer ◽  
X Ray ◽  
Xrf Scanning ◽  
Corrosion Mechanisms ◽  
Cold Metal

The present study investigated the effect of corrosion on an Inconel 625-cladded layer using the cold metal transfer (CMT) method. The corrosion was caused by various ashes and high process temperatures. The ashes were obtained from the biomasses of mixed wood and oat straw, as well as from sewage sludge, by ashing. Long-term corrosion tests were carried out at 650 °C over a period of 1000 h. The chemical composition, mineral phases, and corrosion effects were studied by X-ray fluorescence (XRF), scanning electron microscopy equipped with energy-dispersive X-rays (SEM–EDX), and X-ray diffraction (XRD) from the surface and on the cross-section of the samples. The chemical composition of the ashes was quite different, but representative of their particular fuel. Together with the effects of the operating temperature and mass transfer, significant differences in the degree of the corrosion depth were detected for the various ashes. For the investigated samples, the corrosion mechanisms were inferred based on the identified corrosion products.

The Microstructure of Weld Overlay Ni-Base Alloy Deposited on Carbon Steel by CMT Method

2015 ◽  
Vol 231 ◽  
pp. 119-124 ◽  
Author(s):  
Monika Solecka ◽  
Paweł Petrzak ◽  
Agnieszka Radziszewska
Keyword(s):  
Carbon Steel ◽  
Base Alloy ◽  
Dendritic Structure ◽  
Inconel 625 ◽  
Cold Metal Transfer ◽  
Inconel 625 Alloy ◽  
Second Phases ◽  
Transfer Method ◽  
Cold Metal ◽  
Weld Overlays

Ni-base alloys, like Inconel 625, exhibit a high temperature corrosion and oxidation resistance. For this reason, these alloys are typically used as a one of the most important coating material and can be applied in a different environments and elements of devices having various applications. In this work, Inconel 625 was deposited onto a carbon steel P235GH by Cold Metal Transfer method. Due to the segregation of Ni, Cr, Nb and Mo elements the Inconel 625 weld overlays cladded on boiler pipes P235GH obtained the dendritic structure, with the formation of a second phases at the end of solidification. The presence of γ (with high dislocation density), the Laves and (Nb,Ti)C phases was revealed by means of TEM examinations. The multipoint EDS analysis confirmed the presence of low Fe concentration in the Inconel 625 alloy coatings. The concentration profiles of Ni, Cr, Mo and Nb performed across the dendritic structure showed segregation of these elements.

Weld overlay coating of Inconel 617 M on type 316 L stainless steel by cold metal transfer process

2019 ◽  
Vol 357 ◽  
pp. 1004-1013 ◽  
Author(s):  
Paulson Varghese ◽  
E. Vetrivendan ◽  
Manmath Kumar Dash ◽  
S. Ningshen ◽  
M. Kamaraj ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Transfer Process ◽  
Metal Transfer ◽  
Cold Metal Transfer ◽  
Weld Overlay ◽  
Overlay Coating ◽  
Cold Metal

scholarly journals TEM Microstructure and Chemical Composition of Transition Zone Between Steel Tube and An Inconel 625 Weld Overlay Coating Produced by CMT Method

2017 ◽  
Vol 62 (2) ◽  
pp. 787-793 ◽  
Author(s):  
M. Rozmus-Górnikowska ◽  
M. Blicharski
Keyword(s):  
Chemical Composition ◽  
Transition Zone ◽  
Room Temperature ◽  
Ion Beam ◽  
Base Material ◽  
Steel Tube ◽  
Inconel 625 ◽  
Cold Metal Transfer ◽  
Weld Overlay ◽  
Overlay Coating

AbstractThe aim of this work was to investigate the microstructure and chemical composition of the transition zone between 16Mo3 steel and Inconel 625 weld overlay coating produced by the Cold Metal Transfer (CMT) method. Investigations were primarily carried out through transmission electron microscopy (TEM) on thin foils prepared by FIB (Focus Ion Beam).The chemical analysis demonstrated that the amount of certain elements (Fe, Ni, Cr, Mo, Nb) in the transition zone between the base material and the weld overlay changes quickly, from the composition of the steel to the composition of the composite zone. STEM and TEM investigations revealed that two areas are clearly visible in the transition zone. In the narrow band close to the fusion boundary where plates are clearly visible and theMstemperature is higher than room temperature, electron diffraction analyses show reflections of martensite and austenite. Moreover, the crystallographic relations between martensite and austenite can be described by the Kurdjumov-Sachs (K-S) relationship$\{ 110\} _{\alpha '} ||\{ 111\} _\gamma < 1\bar 11 > _{\alpha '} || < 1\bar 10 > _\gamma $). The microstructure of the part of the transition zone with anMstemperature lower than room temperature as well as that of the composite zone is austenite. The investigations proved that the width of the martensitic area can be significantly limited by using the CMT technique for weld overlaying.

Effect of path strategy on residual stress and distortion in laser and cold metal transfer hybrid additive manufacturing

2021 ◽  
pp. 102203
Author(s):  
Runsheng Li ◽  
Guilan Wang ◽  
Xushan Zhao ◽  
Fusheng Dai ◽  
Cheng Huang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Metal Transfer ◽  
Cold Metal Transfer ◽  
Cold Metal
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