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.

Influence of Boiler Pipe Cladding Techniques on their Microstructure and Properties

2013 ◽  
Vol 58 (4) ◽  
pp. 1093-1096 ◽  
Author(s):  
M. Rozmus-Górnikowska ◽  
M. Blicharski ◽  
J. Kusińsk ◽  
L. Kuslnski ◽  
M. Marszyck
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Base Material ◽  
Inconel 625 ◽  
Weld Overlay ◽  
Overlay Coating ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties ◽  
Steel Boiler

Abstract The aim of this work was to investigate different weld overlay coating technologies applied to steel boiler pipes and their influence on microstructure and properties of the produced overlays. The investigations were carried out on the boiler pipes weld overlaid by an Inconel 625 and cladded at various conditions (CMT, GMAW and GTAW). The investigations showed that microstructure and mechanical properties of overlaid pipes depend on cladding technology and the chemical composition of the base material.

Laser treatment with 625 Inconel powder of hot work tool steel using fibre laser YLS-4000

2018 ◽  
Vol 2 (92) ◽  
pp. 60-67
Author(s):  
L.A. Dobrzański ◽  
E. Jonda ◽  
W. Pakieła ◽  
M. Dziekońska
Keyword(s):  
Chemical Composition ◽  
Laser Treatment ◽  
Laser Cladding ◽  
Tool Steel ◽  
Heat Affected Zone ◽  
Base Material ◽  
Substrate Material ◽  
Inconel 625 ◽  
Fibre Laser ◽  
Weld Overlay

Purpose: The purpose of this investigation was to determine the changes in the surface layer (Inconel 625), obtained during the laser treatment of tool-steel alloy for hot work by the use high-power fibre laser. Design/methodology/approach: Observations of the layer structure, HAZ, and substrate material were made using light and scanning microscopy. The composition of elements and a detailed analysis of the chemical composition in micro-areas was made using the EDS X-ray detector. The thickness of the resulting welds, heat affected zone (HAZ) and the contribution of the base material in the layers was determined. Findings: As a result of laser cladding, using Inconel 625 powder, in the weld overlay microstructure characteristic zones are formed: at the penetration boundary, in the middle of weld overlay and in its top layer. It was found that the height of weld overlay, depth of penetration, width of weld overlay and depth of the heat affected zone grows together with the increasing laser power. Practical implications: Laser cladding is one of the most modern repair processes for eliminating losses, voids, porosity, and cracks on the surface of various metals, including tool alloys for hot work. Laser techniques allow to make layers of materials on the repaired surface, that can significantly differ in chemical composition from the based material (substrate material) or are the same. Originality/value: A significant, dynamic development in materials engineering as well as welding technologies provides the possibility to reduce the cost of production and operation of machinery and equipment, among others by designing parts from materials with special properties (both mechanical and tribological) and the possibility of regeneration of each consumed element with one of the selected welding technologies.

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.

2nd Year Comparison of Superheater Metal Wastage Rates Utilizing Various Boiler Tube Alloys in a Waste-to-Energy Facility

2003 ◽  
Author(s):  
Eric Hanson ◽  
Mark Turner
Keyword(s):  
Base Material ◽  
Waste To Energy ◽  
Inconel 625 ◽  
Turbine Generator ◽  
Weld Overlay ◽  
Time Period ◽  
Energy Facility ◽  
Energy Plant ◽  
Wastage Rate ◽  
Incoloy 825

The SEMASS Resource Recovery Facility (SEMASS) is a processed refuse fuel (PRF) waste-to-energy plant serving Southeastern Massachusetts. The plant consists of three 1000 ton per day boilers that generate steam at 765 F and 650 psig for use in a steam turbine/generator set. Over the past several years there have been a series of plant improvements made in order to achieve compliance with the MACT emission standards. Unfortunately, metal wastage rates due to fire side corrosion of pressure containing components, have increased significantly during this same time period. In an attempt to reduce overall maintenance costs and unscheduled down time due to tube failures, a test of various alloy tube materials was undertaken in 2001 (see NAWTEC#10 paper-1021) in the primary superheater section of boiler #1. The materials tested were SA213-T22 (original spec.), SA213-T22-Heavy Wall, SA213-TP310H, SB-423 Incoloy 825, and Inconel 625 spiral weld overlay of SA213-T22 base material. This paper will summarize the results of the second year of testing including wastage rate tables and annualized costs for the various tube materials.

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.

Electron Microscopy Investigation of Inconel 625 Weld Overlay on Boiler Steel

2015 ◽  
Vol 231 ◽  
pp. 113-118 ◽  
Author(s):  
Paweł Petrzak ◽  
Marek Blicharski ◽  
Stanisław Dymek ◽  
Monika Solecka
Keyword(s):  
Electron Microscopy ◽  
Chemical Composition ◽  
Base Metal ◽  
Light And Electron Microscopy ◽  
Alloying Elements ◽  
Inconel 625 ◽  
Main Element ◽  
Secondary Phases ◽  
Boiler Steel ◽  
Weld Overlay

The investigation was focused on the microstructure characterization as well as changes in chemical composition and hardness of water wall tubing weld overlaid with Inconel 625. The analysis comprised studies in a light and electron microscopy scale that included the evaluation of weld overlays microstructure and microsegregation of alloying elements across the overlay and base metal interface. The particular attention was turned to the distribution of the main element content (Fe, Ni, Mo, Nb, Cr) in the base metal fusion zone as well as in the weld overlay itself. It was shown that the solidification process resulted in significant segregation in alloying elements giving rise to the substantial differences in chemical composition between dendrite cores and interdendritic spaces. It is believed that the microsegregation together with precipitation of secondary phases may contribute to the deterioration of corrosion resistance and overall mechanical properties of weld overlay including ductility and fracture toughness.

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 Research on 16Mo3 steel pipe overlaid with superalloys Inconel 625 using robotized PPTAW

2019 ◽  
Vol 91 (11) ◽  
pp. 9-16
Author(s):  
Artur Czupryński
Keyword(s):  
Dendritic Structure ◽  
Base Material ◽  
Heat Removal ◽  
Nickel Superalloy ◽  
Steel Tube ◽  
Inconel 625 ◽  
Surface Zone ◽  
Technological Parameters ◽  
Non Destructive ◽  
Primary Crystals

The article presents research on the development of technology and mechanical properties of a 16Mo3 steel tube overlaid with Inconel 625 nickel superalloy using robotized Plasma Powder Transferred Arc Welding (PPTAW) process. Based on the results of non-destructive, metallographic and microscopic observations, chemical composition, thickness and hardness measurements of overlays optimal technological parameters for working in elevated temperature environment were selected. The performedtest has shown the correct structure of the overlay weld without welding imperfections. The examined padding weld was characterized by a dendritic structure with primary crystals growing in the direction of heat removal. It has been stated that in the range of heat input to base material 277÷514 J/mm, the iron content in the surface zone of 1,5 mm padding weld ranges from 4 to 5,5%. od 4 do 5,5%.

Comparison of Superheater Metal Wastage Rates Utilizing Various Boiler Tube Alloys in a Waste-to-Energy Facility

2002 ◽  
Author(s):  
Mark Turner ◽  
Eric Hanson
Keyword(s):  
Base Material ◽  
Waste To Energy ◽  
Inconel 625 ◽  
Turbine Generator ◽  
Weld Overlay ◽  
The Past ◽  
Economic Justification ◽  
Energy Facility ◽  
Energy Plant ◽  
Incoloy 825

The SEMASS Resource Recovery Facility (SEMASS) is a processed refuse fuel (PRF) waste-to-energy plant serving Southeastern Massachusetts. The plant consists of three 1000 ton per day boilers that generate steam at 765 F and 650 psig for use in a steam turbine/generator set. Over the past several years, metal wastage rates due to fire side corrosion of pressure containing components, have increased significantly in all three boilers. In an attempt to reduce overall maintenance costs and unscheduled down time due to tube failures, a test of various alloy tube materials was undertaken in the primary superheater section of boiler #1. The materials tested were SA213-T22 (original spec.), SA213-TP310H, SB-423 Incoloy 825, and Inconel 625 spiral weld overlay of SA213-T22 base material. This paper will discuss the results of the test after 9 months of service and any conclusions developed on the economic justification for upgrading tube materials in the remaining two boilers.

scholarly journals Properties of Laser Additive Deposited Metallic Powder of Inconel 625

2020 ◽  
Vol 10 (1) ◽  
pp. 484-490
Author(s):  
Hubert Danielewski ◽  
Bogdan Antoszewski
Keyword(s):  
Chemical Composition ◽  
Manufacturing Process ◽  
Crystallization Process ◽  
Base Material ◽  
High Energy ◽  
Metallic Powder ◽  
High Energy Density ◽  
Inconel 625 ◽  
Additional Material ◽  
Super Alloy

AbstractPaper presents results of laser additive manufacturing. Deposition of nickel based super alloy Inconel 625 was performed. Laser metal deposition is advanced manufacturing process dedicated for prototyping and low scale series production. Inconel 625 is nickel based super alloy, with high heat resistance properties. Therefore due material properties and chemical composition is characterized as a difficult to machining [1, 2]. Additive manufacturing process using focused photons beam for selective deposition of metallic powder in laser engineered net shaping (LENS) method can be used as alternative technology. High energy density of controllable laser beam combining with coaxial delivery system allow to precise deposited metallic powder. Manufacturing process are based on selective melting of additional material using laser radiation and crystallization process. An additional material in form of filler wire as well as metallic powder can be used. Advantages of using metallic powder are higher level of process control, nevertheless adequate selection of process parameters are required. High energy density of laser beam and rapid crystallization process affect on metallographic structure of deposited material. Thermal energy absorbed in material affect on phase transformation.Molten powder mixing with base material changing metallographic structure. Chemical composition of obtained overlay weld are combination of base and additive material. Therefore to achieve stable crystallization process chemical composition of additive material wassimilar to base material. Additional alloying elements could affect on mechanical properties. Deposition process using TruLaserCell 1005 laser machine was performed. To determine properties of manufactured material metallographic analysis and destructive tests were performed.

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