Research on Persistent Fracture Mechanism of Laser Forming Repaired GH4169 Superalloy

Xianliang, 明宪良 Ming; Jing, 陈静 Chen; Hua, 谭华 Tan; Haiou, 杨海欧 Yang; Lin, Xin

doi:10.3788/cjl201542.0403005

Cited by 7 publications

(2 citation statements)

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“…In general, fine and dispersed carbides slow down grain boundary sliding and benefit creep-resistant capability [27][28][29]. It is generally accepted that hard, brittle Laves phases are harmful for the mechanical properties such as tensile, stress rupture and low-cycle fatigue properties in superalloys [30][31][32]. In this study, the MC carbide in the as-cast sample and the M 6 C carbide after solution treatment are located on the grain boundary in the 0.08-wt-% Si alloy (Figure 4(a,b)), which is considered to benefit the creep performance [33].…”

Section: Effect Of Laves On Stress Rupture Propertymentioning

confidence: 99%

Effect of Si addition on the creep performance of a Ni-based superalloy

Xiong

Zhou

Zhang

et al. 2021

Materials Science and Technology

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In this research, the effect of two different per centages of silicon, i.e. 0.08 and 0.3 wt-%, on microstructure and stress rupture life of a Ni-based superalloy was investigated. The results showed that the fraction of eutectic increased from 1.86 to 3.55% with increasing Si content and a higher fraction of eutectic was found on grain boundaries in high Si-bearing alloy. Upon stress rupture at 975°C/225 MPa, cracking initiates and propagates along Laves phases in 0.3 wt-% Si alloy, causing shorter lifetime comparing to that of 0.08 wt-% Si. The microscopic examination uncovered that Si prefers to segregate towards liquid and γ phase, which can explain different rupture lifetimes of two groups of Si-bearing alloys.

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Section: Effect Of Laves On Stress Rupture Propertymentioning

confidence: 99%

Effect of Si addition on the creep performance of a Ni-based superalloy

Xiong

Zhou

Zhang

et al. 2021

Materials Science and Technology

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“…The current pulsing would induce grain refinement in the fusion zone which can lower Nb segregation and Laves phase evolution. Researchers found that the Laves phase is the most sensitive area for crack initiation and propagation [8,9], which is the main reason for the poor tensile, fracture toughness and fatigue fracture properties of welded joints [10][11][12][13]. Therefore, it is necessary to refine the structure and reduce the precipitation of the Laves phase to improve the mechanical properties of GH4169 superalloy welded joints.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on CCTIG welding and PCTIG welding of GH4169 under the same heat input

Yong-jun

Zhang

Guo

et al. 2022

Materials Science and Technology

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GH4169 is a nickel-based superalloy, but high welding heat input and the harmful precipitates of the Laves phase seriously affect the mechanical properties of the welding joint. In this study, constant current tungsten inert gas welding (CCTIG) and pulsed current tungsten inert gas welding (PCTIG) were used to weld the GH4169 alloy sheet under the same heat input. After welding, the relationship between microstructure and comprehensive mechanical properties was analyzed. According to the results, under the same heat input: (1) The PCTIG welded joint has narrower weld and denser microstructure. (2) The pulse current improved the segregation of Nb element at the weld, and then reduced the precipitation of the Laves phase. (3) Pulse current improved the comprehensive mechanical properties of weld metal. The tensile strength and elongation were increased by 18% and 79% respectively.

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