Experimental investigations on creep rupture strength and failure mechanism of vacuum brazed joints of a DS superalloy at elevated temperature

Shi, Duoqi; Dong, Chaofang; Zhang, Lei; Hou, Jinbao; Liu, Ying

doi:10.1016/j.msea.2012.02.099

Cited by 31 publications

(6 citation statements)

References 17 publications

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“…There were small quadrilateral cleavage planes in different areas of the ruptured surface and cracks propagated around these cleavage planes. Such fractographic images were also found in other researches [27]. For the agehardened specimen, the transgranular micro-pores coalescence observed at the intersection of grains, as depicted in Figure 7(b).…”

Section: Fracture Analysissupporting

confidence: 84%

Effects of Ageing and Forging on Short-term Creep Behaviors of Inconel-713C Superalloy at 850 °C

Azadi

Mohammadi

2020

IJE

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In this paper, the short-term creep behavior of the Inconel-713C superalloy after different pre-treatments including the ageing and forging processes has been studied at 850 °C. The ageing heat treatment was heating at 930 °C for 16 hours without solutioning process. The optical microscopy (OM) and the scanning electron microscopy (SEM) techniques were applied for microstructural evaluations. The results showed that although the ageing treatment increased the γ' phase content, the age-hardened material had a lower creep lifetime (about 40%) with respect to the as-cast alloy. This was related to the decrease in the amount of M23C6-type secondary carbides precipitation. When the Inconel-713C superalloy specimen was forged at 1200 °C, the third stage of the creep curve (strain versus time) increased drastically and shortened the creep lifetime. The small grain size of the forged specimen was responsible for such inverse creep behavior. In addition, fractographs of this specimen indicated intragranular cracks on the ruptured surface. When the forged sample was age-hardened directly without the solutioning treatment, the creep lifetime increased about 4 times as compared to the forged specimen.

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Section: Fracture Analysissupporting

confidence: 84%

Effects of Ageing and Forging on Short-term Creep Behaviors of Inconel-713C Superalloy at 850 °C

Azadi

Mohammadi

2020

IJE

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“…Steuer et al and Shi et al [14][15][16] evaluated the creep properties of the transient liquid phase bonding and brazed joints of two different Ni-based superalloys used for blade applications.…”

Section: Introductionmentioning

confidence: 99%

High temperature creep properties of a linear friction welded newly developed wrought Ni-based superalloy

Masoumi

Thébaud

Shahriari

et al. 2018

Materials Science and Engineering: A

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AD730 TM Ni-based superalloy specimens in solution-treated conditions were linear friction welded. Then, post-weld heat treatment (PWHT), consisting of γ´ sub-solvus solution treatments followed by aging, was conducted on the linear friction welded samples. High temperature creep tests were performed on the as-welded and PWHTed joints at two different temperatures: 700°C under 600 and 750 MPa stress levels, and 850°C under 100 and 200 MPa stresses. The creep resistance of the PWHTed joints was higher than that of the as-welded samples. The PWHTed joints exhibited better ductility than that of the base material at 850°C, while they showed slightly lower creep life at 700°C in comparison to the base metal. Microstructure examination showed that cracks initiated at the interface of oxidized particles at 700°C. The decrease in creep resistance of the AD730 TM Ni-based superalloy at 850°C was related to a combination of the formation of precipitate-free zones (PFZ) in the vicinity of the grain boundaries (GBs) and microcracking assisted by oxidation. The Larson-Miller Parameter (LMP) was used to correlate the creep strength, temperature and time to failure for the as-welded and PWHTed samples. LMP values varied between 21.5×10 3 and 24.5×10 3. It was found that in the investigated temperature range, the PWHTed AD730 TM has similar creep characteristics as Udimet TM 720 Li and Inconel 738LC at low values of LMP and better creep properties than those of the Inconel 617 alloy at higher LMP values.

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“…The plate fin structures always have geometrical discontinuities like fillets working as notch. The creep cracks initiate in the fillet and propagate from these geometrical discontinuities [7]. As found by us, different brazing conditions lead to different geometrical morphologies of the fillet [8], generating different stress states.…”

Section: Introductionmentioning

confidence: 65%

Notch effect on creep damage for Hastelloy C276-BNi2 brazing joint

et al. 2015

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Experimental investigations on creep rupture strength and failure mechanism of vacuum brazed joints of a DS superalloy at elevated temperature

Cited by 31 publications

References 17 publications

Effects of Ageing and Forging on Short-term Creep Behaviors of Inconel-713C Superalloy at 850 °C

Effects of Ageing and Forging on Short-term Creep Behaviors of Inconel-713C Superalloy at 850 °C

High temperature creep properties of a linear friction welded newly developed wrought Ni-based superalloy

Notch effect on creep damage for Hastelloy C276-BNi2 brazing joint

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