Liquation cracking in the heat-affected zone of IN939 superalloy tungsten inert gas weldments

Kazempour-Liasi, H.; Tajally, Mohammad; Abdollah-Pour, Hassan

doi:10.1007/s12613-019-1954-y

Cited by 15 publications

(2 citation statements)

References 25 publications

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“…However, the presence of Ni 5 Zr was not detected in Inconel 713C ® by other authors [ 40 , 41 ]. Similar findings confirming the Ni 7 Zr 2 phase have been reported for Inconel 939 ® [ 42 ] and Inconel 738 ® [ 43 ]. The morphology and microanalysis of carbides (MC-type) located near the Ni 7 Zr 2 compound reveal a strong enrichment in Nb and Zr, which can indicate that during casting solidification, a ternary eutectic transformation occurs: L (residual with high Zr and C content) → γ + Ni 7 Zr 2 + (Nb, Zr)C. Babu [ 44 ] suggested that eutectic-type transformations in chemically complex nickel-based superalloys can be more intricate.…”

Section: Resultssupporting

confidence: 90%

The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings

Cygan

Rakoczy

2023

Materials

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In this work, three melt-pouring temperatures (1450 °C, 1480 °C, 1520 °C) and CoAl2O4 inoculant contents in the shell mold’s primary coating (0 wt%, 5 wt%, and 10 wt%) were selected to study microstructural and mechanical property changes of the Inconel 713C® nickel-based superalloy. The castings’ phase transformation temperatures, phase constitution, microstructure, and mechanical properties at room and elevated temperatures were investigated via thermodynamical simulations, differential thermal analysis, light and scanning electron microscopy, energy-dispersive X-ray spectroscopy, and tensile and stress-rupture tests. The pouring temperature and inoculant content strongly influenced the mean equiaxed grain size, which ranged between 2.36 and 6.55 mm. The primary microstructure of Inconel 713C® castings, owing to its complex chemical composition, comprised multiple phases, including γ, γ’, MC, M3B2, and Ni7Zr2. The mean size of γ’ was in the 0.446–0.613 μm range, depending on the casting variant. Grain refinement with CoAl2O4 at ambient temperature for each melt-pouring temperature led to increased yield strength (YS) and ultimate tensile strength (UTS). YS was in the range of 775–835 MPa, while UTS was in the range of 868–1010 MPa. A reverse trend was observed in samples that crept in 982 °C/152 MPa, while for each variant, the time to rupture exceeded 30 h. The maximum time to rupture was 46.1 h obtained in the unmodified casting poured at 1480 °C.

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Section: Resultssupporting

confidence: 90%

The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings

Cygan

Rakoczy

2023

Materials

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“…[7] Besides the solidification cracking, there is associated grain boundary cracking with the formation of a liquid film along a grain boundary, opening a crack under the influence of the thermal residual stresses during cooling. [8] Due to the reheating and remelting associated with LPBF, ductility dip cracking (DDC) [9] could occur, associated with the poor ductility of Ni superalloys at intermediate temperature ranges, resulting in crack formations under the action of the residual stresses. Crack formation occurs due to metallurgical and process-induced factors.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

A Melt Pool Temperature Model in Laser Powder Bed Fabricated CM247LC Ni Superalloy to Rationalize Crack Formation and Microstructural Inhomogeneities

Wang

Deng

et al. 2021

Metall Mater Trans A

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This study of the laser powder bed fusion (LPBF) of γ′-strengthened Ni superalloy CM247LC focuses on the development of a melt pool temperature model to predict crack density within the alloy. This study also analyzes spatter and elemental evaporation, which might cause defects and inhomogeneities, at different melt pool temperatures. The melt pool temperature model provides more accurate predictions than the widely used energy density model. Spatter particles were collected and characterized to study their sizes and chemical compositions, compared with the virgin powder, recycled powder, and as-built samples, to probe the impact of their entrapment into the melt pool. This study also investigated Al evaporation, revealing that its extent does not correlate with the laser energy density and is believed to be rather limited by comparing the chemistry of the virgin powder and the build. Last, the impact of LPBF process parameters on the formation of these inhomogeneities, and accordingly crack formation, was studied using finite element analysis by estimating the maximum melt pool temperature and correlating it with the formation of the microstructural inhomogeneities. The morphology of the various cracking modes was associated with the process parameters.

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Investigating the Effects of Repair Welding on Microstructure, Mechanical Properties, and Corrosion Behavior of IN-939 Superalloy

Mashhuriazar

Badihehaghdam

Gür

et al. 2022

J. of Materi Eng and Perform

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Liquation cracking in the heat-affected zone of IN939 superalloy tungsten inert gas weldments

Cited by 15 publications

References 25 publications

The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings

The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings

A Melt Pool Temperature Model in Laser Powder Bed Fabricated CM247LC Ni Superalloy to Rationalize Crack Formation and Microstructural Inhomogeneities

Investigating the Effects of Repair Welding on Microstructure, Mechanical Properties, and Corrosion Behavior of IN-939 Superalloy

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