Microstructural analysis of laser weld fusion zone in Haynes 282 superalloy

Osoba, L.O.; Ding, Rengen; Ojo, O.A.

doi:10.1016/j.matchar.2011.12.009

Cited by 69 publications

(19 citation statements)

References 12 publications

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“…Chromium shows no segregation tendency in both weld metals with the k value very close to unity. The result is in well agreements with those reported in other superalloy weld metals [ 25 , 26 , 27 ]. It is notable to see that interdendritic region segregation alloying elements such as Nb, Ti, and Mo are also strong carbide formers.…”

Section: Discussionsupporting

confidence: 92%

Evaluating the Microstructures and Mechanical Properties of Dissimilar Metal Joints Between a New Cast Superalloy K4750 and Hastelloy X Alloy by Using Different Filler Materials

Xie

et al. 2018

Materials

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Two kinds of filler materials were used to join dissimilar alloys between a new cast superalloy K4750 and Hastelloy X by tungsten gas arc welding (GTAW). The segregation behavior, interfacial microstructure and mechanical properties of the dissimilar joints were evaluated. The results show that both filler materials can be used to obtain sound dissimilar joints successfully. Microstructural observation show that no obvious cracking is observed in the joints achieved by both filler materials. The segregation extent of various elements in Hastelloy X weld metal is more severe than that in the K4750 weld metal. No unmixed zones were observed at the interfaces. Transition areas with the chemical compositions various between the K4750 alloy and the Hastelloy X alloy were found at the joint interfaces. The maximum width of the transition area between the K4750 weld metal and Hastelloy X base metal is smaller than that between the Hastelloy X weld metal and K4750 base metal. The ultimate tensile strength and yield strength of the joints with Hastelloy X filler material are slightly higher than those with K4750 filler material, however, the K4750 filler material results in a higher total elongation and fusion zone microhardness than those with Hastelloy X filler material. Both dissimilar joints fractured with a ductile feature which exhibits tearing edges and dimples. Hastelloy X filler material is suggested to be more suitable for joining of K4750 superalloy and Hastelloy X dissimilar metals in terms of obtaining superior comprehensive mechanical properties.

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Section: Discussionsupporting

confidence: 92%

Evaluating the Microstructures and Mechanical Properties of Dissimilar Metal Joints Between a New Cast Superalloy K4750 and Hastelloy X Alloy by Using Different Filler Materials

Xie

et al. 2018

Materials

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“…Such high temperature capability of Haynes ® 282 ® is possible due to the specific chemical composition and its relatively low γʹ content, which also assures its thermal stability [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Also, this alloy features improved formability and weldability as a consequence of the lowered content of γʹ phase in comparison with, e.g., Waspaloy [ 9 , 10 , 11 , 12 , 13 , 14 ]. Mechanical properties are maintained at required levels despite low amounts of Al and Ti.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Haynes® 282® Superalloy after Vacuum Induction Melting and Investment Casting of Thin-Walled Components

et al. 2013

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The aim of this work was to characterize the microstructure of the as-cast Haynes® 282® alloy. Observations and analyses were carried out using techniques such as X-ray diffraction (XRD), light microscopy (LM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray spectroscopy (EDS), wave length dispersive X-ray spectroscopy (WDS), auger electron spectroscopy (AES) and electron energy-loss spectrometry (EELS). The phases identified in the as-cast alloy include: γ (gamma matrix), γʹ (matrix strengthening phase), (TiMoCr)C (primary carbide), TiN (primary nitride), σ (sigma-TCP phase), (TiMo)2SC (carbosulphide) and a lamellar constituent consisting of molybdenum and chromium rich secondary carbide phase together with γ phase. Within the dendrites the γʹ appears mostly in the form of spherical, nanometric precipitates (74 nm), while coarser (113 nm) cubic γʹ precipitates are present in the interdendritic areas. Volume fraction content of the γʹ precipitates in the dendrites and interdendritic areas are 9.6% and 8.5%, respectively. Primary nitrides metallic nitrides (MN), are homogeneously dispersed in the as-cast microstructure, while primary carbides metallic carbides (MC), preferentially precipitate in interdendritic areas. Such preference is also observed in the case of globular σ phase. Lamellar constituents characterized as secondary carbides/γ phases were together with (TiMo)2SC phase always observed adjacent to σ phase precipitates. Crystallographic relations were established in-between the MC, σ, secondary carbides and γ/γʹ matrix.

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“…Since the unique high temperature properties are governed by the nanometre sized '-phase, it is of great importance to understand the kinetics of precipitation. This is not only of importance when designing or optimizing the heat treatment of this and similar alloys, but is also of interest when processing the alloy or using it in various types of manufacturing processes [2,[7][8][9][10]. The ' hardening alloys are known to harden rapidly, which in turn creates difficulties during primary (e.g.…”

Section: Introductionmentioning

confidence: 99%

Correlation of precipitate evolution with Vickers hardness in Haynes® 282® superalloy: In-situ high-energy SAXS/WAXS investigation

Haas¹,

Andersson

Fisk

et al. 2018

Materials Science and Engineering: A

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The aim of this work is to characterize the precipitation kinetics in Haynes® 282® superalloys using insitu high-energy Small Angle X-ray Scattering (SAXS) together with Wide Angle X-ray Scattering (WAXS). The phases identified by WAXS include (matrix), ' (hardening precipitates), MC (metallic carbides), and M 23 C 6 /M 6 C (secondary metallic carbides). The-precipitates are spheroids with a diameter of several nanometres, depending on the temperature and ageing time. From the SAXS data, quantitative parameters such as volume fraction, number density and inter-particle distance were determined and correlated with ex-situ Vickers microhardness measurements. The strengthening components associated with precipitates and solid solutions are differentiated using the measured Vickers microhardness and SAXS model parameters. A square root dependence between strengthening attributable to the precipitates and the product of volume fraction and mean precipitate radius is found. The solid solution strengthening component correlates with the total volume fraction of precipitates.

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Microstructural analysis of laser weld fusion zone in Haynes 282 superalloy

Cited by 69 publications

References 12 publications

Evaluating the Microstructures and Mechanical Properties of Dissimilar Metal Joints Between a New Cast Superalloy K4750 and Hastelloy X Alloy by Using Different Filler Materials

Evaluating the Microstructures and Mechanical Properties of Dissimilar Metal Joints Between a New Cast Superalloy K4750 and Hastelloy X Alloy by Using Different Filler Materials

Microstructure of Haynes® 282® Superalloy after Vacuum Induction Melting and Investment Casting of Thin-Walled Components

Correlation of precipitate evolution with Vickers hardness in Haynes® 282® superalloy: In-situ high-energy SAXS/WAXS investigation

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