In-situ neutron diffraction measurement of stress redistribution in a dissimilar joint during heat treatment

Dodge, Michael; Gittos, M. F.; Dong, Haibo; Zhang, S.Y.; Kabra, Saurabh; Kelleher, Joe

doi:10.1016/j.msea.2014.12.095

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…have been commonly used in studies of engineering materials by measuring the lattice spacings of the major constituent phases. [1][2][3][4][5][6] Such techniques have become important approaches when investigating the role/behavior of c¢ phase in Ni-base superalloys [6][7][8][9][10] since the successful separation of the overlapping c-c¢ through the deconvolution method was first reported by Stone et al [6] Regarding the c¢¢ strengthened Ni-base superalloys such as Inconel 718 (IN718), most of the reported in-situ diffraction experiments on these alloys have measured the lattice spacings of the c matrix phase but not the c¢¢ phase. Hence, the role/behavior of c¢¢ phase in these alloys has rarely been studied using in-situ diffraction due to the difficulties in analysis of gamma double prime peaks.…”

Section: In-situ Neutron/synchrotron Diffraction Techniquesmentioning

confidence: 99%

Using Variant Selection to Facilitate Accurate Fitting of γ″ Peaks in Neutron Diffraction

Zhang

Qin

et al. 2019

Metall Mater Trans A

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c¢¢ diffraction peaks are hard to discern in neutron/X-ray diffraction patterns, hindering studies on the c¢¢-strengthened superalloys using in-situ diffraction. In this study, we propose a variant selection method to increase the intensity of c¢¢ peaks and to facilitate accurate fitting. The specific variants of c¢¢ are controlled by applying a 300 MPa tensile stress during aging at 790°C for 5 hours. The interaction energy between the applied stress and the transformation strain of each c¢¢ variant differs, leading to an increase in the amount of the variants with a greater energy reduction at the expense of other variants. The enhanced variants result in greater c¢¢ peak intensities in neutron diffraction patterns, allowing both the Pawley refinement and single peak fitting to be performed. Lattice parameters of c¢¢ and c phases, and lattice misfit between the two phases and volume fraction of c¢¢ are acquired. The uncertainties associated with the fitting maintain an acceptable level corresponding to 150 microstrains. The proposed variant selection method shows potential for studying the role of c¢¢ phase in Ni-base superalloys.

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Section: In-situ Neutron/synchrotron Diffraction Techniquesmentioning

confidence: 99%

Using Variant Selection to Facilitate Accurate Fitting of γ″ Peaks in Neutron Diffraction

Zhang

Qin

et al. 2019

Metall Mater Trans A

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“…This equipment made of forged steels, such as ASTM A182 F22 steel, arrives at sea in a pre-assembled state in order to facilitate field assembly and be welded to pipeline made of most malleable steel, such as ASTM A36 steel. Before welding, the part of this equipment, which will be joined to the pipelines, is previously subjected to a deposition of welding passes, named buttering, using Ni alloys such as Inconel 625, in order to reduce the effect caused by the welding thermal cycle on the heat affected zone (HAZ) in view of the dissimilarity of between steel and nickel alloy 1 . Partially mixed zones (PMZs) and carbides can reach high hardness values, compromising the toughness of this region 2 , involving carbon-rich microphases 3 even after the application of post-weld heat treatment (PWHT) 4 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen on the Mechanical Properties of ASTM A182 F22 and ASTM A36 Steels Welded Joint Using Inconel 625 as Filler and Buttering Metal

et al. 2022

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A 182 F22 steel, used in components subsea for oil extraction, are previously buttered with ductile metal such as Inconel 625, before being welded to steel pipes similar to ASTM A36 steels. The thermal buttering weld cycle provides the formation of high hardness micro-phases and carbides at the interface between F22 steel and the buttering with Inconel, which when in contact with hydrogen, originating from the cathodic protection applied to these equipment, can lead to the embrittlement of this region, causing fragile fractures. In this work, ASTM A 182 F22 steel, buttered with Inconel 625 and welded to A36 steel, submitted to post-weld heat treatment without hydrogenation and subjected to cathodic protection for hydrogen permeation were submitted to fracture toughness test. The welds and buttering were done using GMAW process with AWS ERNiCrMo-3 wire as filler and buttering metal and a mixture of Ar and He as shield gas. The results indicated a 56% of area reduction, and 15% in the elongation values in the tensile tests, in addition to a 13.3% reduction in the CTOD value, for welded joints subjected to hydrogen permeation, which showed a quasi-cleavage fracture mechanism.

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“…Stress states strongly affect on the initiation and propagation of stress corrosion cracking and fatigue cracking, therefore, assessments of structural integrity should take into account the stress state during operation. There are many reports about the residual stress of dissimilar weld joints [1][2][3]; however, the residual stress relaxation mechanism at relatively low temperatures, for example, 593 K, which corresponds to the operating temperature of pressurized water reactors, has not yet enough clarified.…”

Section: Introductionmentioning

confidence: 99%

In-situ Residual Stress Analysis during Thermal Cycle of a Dissimilar Weld Joint Using Neutron Diffraction and IEFEM

Akita

Shibahara

Ikushima

et al. 2017

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Residual stress is one of important issues for optimizing the manufacturing process and ensuring the structural integrity of welded components. Many results on the issue have been reported, however, the residual stress relaxation mechanism of dissimilar weld joint by the thermal cycle is not yet enough clarified. In this study, the residual stress evolution process of a dissimilar weld joint during thermal cycle was investigated using in-situ neutron diffraction technique and the Idealized Explicit Finite Element Method (IEFEM). The base materials of the dissimilar weld specimen were a SUS316L stainless steel and a NCF600 nickel alloy. The obtained results clearly show that the residual stress especially in the NCF600 side decreased in the first thermal cycle due to yielding of the NCF600. This yielding was caused by an estimation that the total stress, which is the sum of the initial welding residual stress and the thermal stress, exceeded the yield strength of NCF600 during the heating process.

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In-situ neutron diffraction measurement of stress redistribution in a dissimilar joint during heat treatment

Cited by 11 publications

References 11 publications

Using Variant Selection to Facilitate Accurate Fitting of γ″ Peaks in Neutron Diffraction

Using Variant Selection to Facilitate Accurate Fitting of γ″ Peaks in Neutron Diffraction

Effect of Hydrogen on the Mechanical Properties of ASTM A182 F22 and ASTM A36 Steels Welded Joint Using Inconel 625 as Filler and Buttering Metal

In-situ Residual Stress Analysis during Thermal Cycle of a Dissimilar Weld Joint Using Neutron Diffraction and IEFEM

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