Direct Observation of Liquation in Ni-Base Superalloy by Using Confocal Laser Scanning Microscopy

Phuraya, Noppakorn; Phung-On, Isaratat; Terasaki, Hidenori; Komizo, Yuuichi

doi:10.4028/www.scientific.net/kem.658.36

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Wen [3] reported the behavior of grain boundary liquation cracking in fiber laser welding of alloy 617 and found that the degree of liquation cracking decreased when the heating input and preheating temperature increased. Phuraya [22] used a high-temperature confocal laser scanning microscopy to investigate the liquation process of alloy 617 by in situ observation. Meanwhile, Xu [23] reported that some lamellar structures occurred near the fusion line of alloy 617B welded joint and found that the peak temperature played a key role in the formation of these lamellar structures.…”

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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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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“…At an LMP value of 28,000, the aged specimen resisted load bearing better than the AS and SO specimens. This was because the aged specimens had more γ'-Ni3 (Al, Ti) precipitate, which resulted in high temperature strength and creep strength [12][13].…”

Section: Fig 4 Larson-miller Parameter Plot For Inconel 617 In As-rementioning

confidence: 99%

Effect of Heat Treatment on Properties of INCONEL 617 Investigated in Accelerated Creep Testing

Phuraya¹,

Phung-On²,

Srithorn³

2017

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Abstract. An accelerated creep test was implemented to study the effects of heat treatment on the creep properties of INCONEL 617. Three heat treatment conditions were set on the test specimens, including 1) as-received, 2) aged as the simulation of service conditions at 650°C for 1,000 h and 3) solutionised. The accelerated creep test was performed at 700, 750, 800 and 900°C with applied stress at 80% and 90% of the yield stress (YS) at tested temperatures. The results were analysed for both time to rupture and % RA, which showed that there was a significant drop in time to rupture and % RA at 750°C. Subsequently, the % RA increased while the time to rupture gradually decreased. The Larson Miller curve for all heat treatment conditions could be plotted with an interest in the presence of an intersection zone. This indicated the possibility of failure behaviour changes from a creep mode to an overload mode at low applied loads to high applied loads, respectively.

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Recent research progress in the mechanism and suppression of fusion welding-induced liquation cracking of nickel based superalloys

Yi,

Shan,

Zhao

et al. 2024

Int J Miner Metall Mater

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Direct Observation of Liquation in Ni-Base Superalloy by Using Confocal Laser Scanning Microscopy

Cited by 5 publications

References 5 publications

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

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

Effect of Heat Treatment on Properties of INCONEL 617 Investigated in Accelerated Creep Testing

Recent research progress in the mechanism and suppression of fusion welding-induced liquation cracking of nickel based superalloys

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