Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs)

Subramanian, Mohan; Galler, Jonathan P.; DuPont, J. N.; Kombaiah, Boopathy; Yu, Xinghua; Zhao, Feng; Babu, S. S.

doi:10.1016/j.msea.2019.01.075

Cited by 20 publications

(3 citation statements)

References 18 publications

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“…Still, adequate creep data at different temperatures and constant stress conditions were not yet discussed. However, with other ferritic/martensitic and austenitic-type dissimilar combinations, UCT and rupture behaviour were reported for the friction welding (FRW), 14 shielded metal arc welding (SMAW) 15 and gas tungsten arc welding (GTAW) 16 techniques. The UCT data alone are insufficient for evaluating the overall creep characteristics of the DWJ because the creep parameters may vary at the weld and HAZs due to the evolution of dissimilar microstructures.…”

Section: Introductionmentioning

confidence: 99%

Unravelling the microstructure – indentation creep resistance relationships for friction stir welded modified 9Cr-1Mo steel and LN-type 316 stainless-steel dissimilar joints

krishna¹,

Lakshminarayanan²,

Vasantharaja

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this article, the indentation creep characteristics and the microstructures are assessed for the friction stir welded modified 9Cr-1Mo steel and LN-type 316 SS dissimilar joint. Microstructures are characterized for the post-weld heat treated and indentation crept samples at different conditions with optical microscopy, scanning electron microscope and energy dispersive X-ray spectroscopy. Distinct heat-affected zones were revealed with the refined and reformed martensite (α′) and austenite (γ) structures that formed in view of the distinct thermal conductivity property and the differences in lower critical(Ac1) and upper critical(Ac3) transformation temperatures. The size of prior austenite grain sizes was found to be varied significantly at the different regions. Indentation creep data were acquired in distinct weld zones at 873, 898 and 923 K. Zone-wise indentation depth, steady-state creep behaviour (SSCR) and activation energy ( Q) were evaluated and correlated with the microstructures. The formation of small prior austenitic grain (PAG) structures and the grain boundary vacancies has led to maximum creep deformation (86.83%) at the heat affected zone of the modified 9Cr-1Mo steel. Furthermore, the reduction in lath structures and the formation of tiny α′ with soft substructures have lowered the hardness values to around 210 ± 21 HV, which is 20 HV less than the post weld heat treated sample. In the stir zone, the presence of dynamically refined and rich γ along with fine α′ layers has improved the steady-state creep rate of 9.112 E-7, which is less than the modified 9Cr-1Mo steel and the heat affected zone at modified 9Cr-1Mo side. The coarse austenite structures that existed in the LN-type 316 base metal have resisted more creep damage and exhibited high activation energy (i.e. 490 kJ mol−1) than the stir zone and heat affected zone of the LN-type 316 SS.

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Section: Introductionmentioning

confidence: 99%

Unravelling the microstructure – indentation creep resistance relationships for friction stir welded modified 9Cr-1Mo steel and LN-type 316 stainless-steel dissimilar joints

krishna¹,

Lakshminarayanan²,

Vasantharaja

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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show abstract

“…Under this consideration, filler metals Alloy 82 and Alloy 182 have been applied to manufacture the DMWs used in nuclear power plants [3,4]. However, several premature failures on Alloy 82 and 182 DMWs were reported [1,5]. It was stated that Alloy 82 and Alloy 182 were susceptible to stress corrosion cracking in the primary water environment [6,7].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale chromium carbides induced abnormal hardness in dissimilar metal welds

Liu

Nelson

McCracken

et al. 2021

Science and Technology of Welding and Joining

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This study showed that high-density nano-precipitates, which have not been observed before, formed in the carbon-enriched zone located 20 µm away from the fusion boundary of the dissimilar metal welds of Alloy 52M and A508 steel. The nano-precipitate, which was named as CrC x in this study, was in a rodlike shape and shorter than 30 nm. The atoms of CrC x were arranged as a face-centered cubic (FCC) crystal. The CrC x precipitates have a lattice parameter of 4.08 Å and a cube-on-cube orientation relationship with the austenitic matrix of Alloy 52M. The results will be of great benefit to the development of advanced dissimilar metal welds and new Ni-based alloys serviceable in a harsh environment.

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“…And the grain size effect is independent of the grain size. Subramanian et al [9] performed a number of experiments to investigate the effect of the mechanism of premature failure of bimetal welds, which are caused by the close proximity of the ferrite (BCC) and austenite (FCC) interfaces. e results revealed that premature failure depends on the initial carbide distribution of the zone.…”

Section: Introductionmentioning

confidence: 99%

Compilation and Application of UMAT for Mechanical Properties of Heterogeneous Metal Welded Joints in Nuclear Power Materials

Xue

Wang

et al. 2019

Advances in Materials Science and Engineering

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For the problem of mechanical properties of heterogeneous dissimilar metal welded joints, when analyzed by the finite element method, it is usually simplified into a “sandwich” material structure model. However, the mechanical properties of materials in different regions of the “sandwich” material mechanics model are different, and there will be mutations at the material interface. In order to accurately describe the mechanical properties of welded joints, the constitutive equations of dissimilar metal welded joint materials were compiled, and the constitutive equations of inhomogeneous materials whose material mechanical properties were continuously changed with space coordinates were established. The ABAQUS software was used to establish the “sandwich” model and the continuous transition model. The model is used to compare and analyze the crack tip stress distribution of different yield strength mismatch coefficients. The results show that the continuous transition material model eliminates the mutation of the “sandwich” model at the material interface and achieves the continuous change of the mechanical properties of the material. For the longitudinal crack, under the influence of different mismatch coefficients, the crack tip stress field of the transitional material model is deflected toward the low yield strength side. The compilation of constitutive equations for continuous transition materials of dissimilar metal welded joints provides a basis for the safety evaluation of dissimilar metal welded joints.

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Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs)

Cited by 20 publications

References 18 publications

Unravelling the microstructure – indentation creep resistance relationships for friction stir welded modified 9Cr-1Mo steel and LN-type 316 stainless-steel dissimilar joints

Unravelling the microstructure – indentation creep resistance relationships for friction stir welded modified 9Cr-1Mo steel and LN-type 316 stainless-steel dissimilar joints

Nanoscale chromium carbides induced abnormal hardness in dissimilar metal welds

Compilation and Application of UMAT for Mechanical Properties of Heterogeneous Metal Welded Joints in Nuclear Power Materials

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