A study of the weldability and weld related microstructure of cabot alloy 214

Cieslak, M.J.; Stephens, J. A.; Carr, M. J.

doi:10.1007/bf02649280

Cited by 34 publications

(20 citation statements)

References 8 publications

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“…[17,18] The reverse segregation behavior of Al in the fusion zone as compared to its negative segregation during casting of IN 738, as reported by Taha and Kruz, [19] could be due to the back-diffusion effect. It is known that during dendritic solidification, the extent of segregation can be significantly reduced by solidstate diffusion, [20] which would be more pronounced with slowly cooled casting compared to the rapidly solidified weld metal.…”

Section: Elemental Partitioning In the Fusion Zonementioning

confidence: 85%

Study of the fusion zone and heat-affected zone microstructures in tungsten inert gas-welded INCONEL 738LC superalloy

Ojo

Richards

Chaturvedi

2006

Metall Mater Trans A

124

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The fusion zone and heat-affected zone (HAZ) microstructures obtained during tungsten inert gas (TIG) welding of a commercial superalloy IN 738LC were examined. The microsegregation observed during solidification in the fusion zone indicated that while Co, Cr, and W segregated to the ␥ dendrites, Nb, Ti, Ta, Mo, Al, and Zr were rejected into the interdendritic liquid. Electron diffraction and energydispersive X-ray microanalyses using a transmission electron microscope (TEM) of secondary phases, extracted from the fusion zone on carbon replicas, and of those in thin foils prepared from the fusion zone showed that the major secondary solidification constituents, formed from the interdendritic liquid, were cubic MC-type carbides and ␥-␥Ј eutectic. The terminal solidification reaction product was found to consist of M 3 B 2 and Ni 7 Zr 2 formed in front of the interdendritic ␥-␥Ј eutectic. Based on the knowledge of the Ni-Ti-C ternary system, a pseudoternary solidification diagram was adapted for IN 738 superalloy, which adequately explained the as-solidified microstructure. The HAZ microfissuring was observed in regions surrounding the fusion zone. Closer and careful microstructural examination by analytical scanning electron microscopy revealed formation of re-solidified constituents along the microfissured HAZ grain boundaries, which suggest that HAZ cracking in this alloy involves liquation cracking. Liquation of various phases present in preweld alloy as well as characteristics of the intergranular liquid film contributing to the alloy's low resistance to HAZ cracking were identified and are discussed.

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Section: Elemental Partitioning In the Fusion Zonementioning

confidence: 85%

Study of the fusion zone and heat-affected zone microstructures in tungsten inert gas-welded INCONEL 738LC superalloy

Ojo

Richards

Chaturvedi

2006

Metall Mater Trans A

124

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“…These micro-structural changes could not be avoided, due to the very rapid cooling process after laser welding, 25 and could not be restored with an adequate thermal treatment. Indeed, trials done at a temperature close to the melting point failed.…”

Section: Discussionmentioning

confidence: 99%

The laser welding technique applied to the non precious dental alloys procedure and results

Bertrand¹,

Petitcorps

Albingre

et al. 2001

Br Dent J

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RESEARCHprosthodontics have a laser in their laboratory. However, looking at the available literature, since 1970 many experiments have been conducted into non precious and precious alloys and have shown contradictory results, probably because the experimental procedures used were different. 15,16,17,18,19 Therefore no comparison could be made. In this study, the weldability of three non precious alloys was investigated. The procedure consisted of determining the appropriate welding parameters which could achieve a deep joining in depth without cracks or gas entrapments in the welding area. The quality of the joining was checked by metallographic observations on polished sections. Wires of different diameters were then laser-welded and tested in tension. In order to understand the different behaviours between the three alloys (2 Ni-Cr and 1 Co-Cr based alloys), the composition of the welded area was determined by a X-Ray microprobe. Particular attention was given to the role played by the impurities. Methods Chemical compositionsTwo Ni-Cr-Mo alloys and 1 Co-Cr-Mo alloy, manufactured by Dentaurum (Pforzheim, Germany) were chosen for their applications in the dental field (Table 1) : 1 G mou is a low cost alloy used for crowns and bridges. 2 Remanium Cs is used for ceramic fixed partial dentures. 3 GM 800 is a cobalt chrominium alloy used for removable and fixed partial dentures Laser parameters and welding conditionsIn order to determine the welding conditions against the metal thickness and the ability of the laser device, two series of cast wires (0.6 to 2 mm thick), and five specimen DIN 50125 (3mm thick) were prepared by investment casting. The samples were then cut, joined by hand, edge to edge and welded without fillers or fluxes, using a commercial Nd-Yag laser (DL 2002 manufactured by Dentaurum) whose technical characteristics are given in table 2. In order to avoid the laser beam reflection and to improve the weld penetration, all the wires were sand-blasted with alumina powders and welded under Argon shielding atmosphere to decrease the oxidation contamination. All the samples were welded using the same procedure. The Laser conditions depend on the thickness and the volume of material to be welded (Table 2).Each wire was first assembled by the 4-cardinal points and thenThe laser welding technique applied to the non precious dental alloys procedure and results Aim The laser welding technique was chosen for its versatility in the repair of dental metal prosthesis. The aim of this research is to assess the accuracy, quality and reproducibility of this technique as applied to Ni-Cr-Mo and Cr-Co-Mo alloys often used to make prosthesis Method The alloy's ability to weld was evaluated with a pulsed Nd-Yag Laser equipment. In order to evaluate the joining, various cast wires with different diameters were used. The efficiency of the joining was measured with tensile tests. In order to understand this difference, metallographic examinations and XRay microprobe analysis were performed through the welded area and c...

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“…Welding is a common technique to join nickel-based alloys and other metals such as steels. For nickel-based alloys, welding provides thermal cycles far away from equilibrium, presenting some new metallurgical phenomena such as liquation cracking [3][4][5], solidification cracking [6][7][8], and so on. These phenomena lead to a decline in joint performance [9,10].…”

Section: Introductionmentioning

confidence: 99%

The Mechanism for HAZ Liquation of Nickel-Based Alloy 617B During Gas Tungsten Arc Welding

et al. 2020

Metals

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The mechanism for HAZ (heat-affected zone) liquation of alloy 617B during gas tungsten arc welding (GTAW) was investigated. Welding thermal simulation work was conducted to investigate the effects of thermal parameters (peak temperature, holding time, and thermal cycle numbers) on M23C6 carbides’ evolutionary behavior in nickel-based alloy 617B. OM (optical microscopy), SEM (scanning electron microscopy), TEM (transmission electron microscopy), and SIMS (secondary ion mass spectrometry) were employed to characterize HAZ carbides. It was found that the constitutional liquation of M23C6 carbides is responsible for HAZ liquation in alloy 617B. Rapid heating meant that solute atoms released from partially dissolved M23C6 carbides did not have enough time to sufficiently diffuse into the matrix, resulting in eutectic reaction M23C6 + γ → liquid in the temperature range from 1250 °C to 1300 °C. In the following cooling process, the liquid phase transformed into γ and M23C6 (or M6C) carbides simultaneously, creating a eutectic microstructure. Subsequent thermal cycles with peak temperature 1100 °C and proper holding time brought about a tempering effect to precipitate fine M23C6 carbides from the Cr supersaturated zone around the eutectic microstructure. Boron was found to be enriched in carbides and was expected to promote HAZ liquation by two mechanisms. No cracking caused by HAZ liquation has been found, indicating that GTAW is a suitable method for joining alloy 617B.

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A study of the weldability and weld related microstructure of cabot alloy 214

Cited by 34 publications

References 8 publications

Study of the fusion zone and heat-affected zone microstructures in tungsten inert gas-welded INCONEL 738LC superalloy

Study of the fusion zone and heat-affected zone microstructures in tungsten inert gas-welded INCONEL 738LC superalloy

The laser welding technique applied to the non precious dental alloys procedure and results

The Mechanism for HAZ Liquation of Nickel-Based Alloy 617B During Gas Tungsten Arc Welding

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