The effect of aging on hydrogen trapping in precipitation-hardened alloys

Pound, Bruce G.

doi:10.1016/s0010-938x(00)00036-6

Cited by 24 publications

(11 citation statements)

References 28 publications

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“…Other authors explored the role of precipitates in the mechanism of HE in alloy 718 at lower temperatures [14][15][16][17], such as room temperature. Liu et al [14) showed that hydrogen induced cracking in 8 rich alloy 718 occurred at 8/ matrix interfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on hydrogen embrittlement susceptibility of alloy 718 in Light Water Reactor environment

Galliano¹,

Andrieu

Cloué³

et al. 2017

International Journal of Hydrogen Energy

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A 718 superalloy, presenting a standard microstructure, was mechanically tested under uniaxial tensile loading at 80 C and 300 C in Light Water Reactor environment after an exposure at 300 C for 200 h. Hydrogen embrittlement mechanism was clearly observed. In order to identify the most influent metallurgical parameters on hydrogen embrittlement, three "model" microstructures were synthesized to test the efficiency of carbides, d, g 0 and g" precipitates to trap hydrogen at different temperatures. Results showed that g 0 and g" played the major role on the hydrogen embrittlement susceptibility of the alloy even though carbides and d precipitates could also act as hydrogen traps and influence the final rupture mechanism. Results also characterized the influence of temperature on the frac ture modes.

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Section: Introductionmentioning

confidence: 99%

Effect of temperature on hydrogen embrittlement susceptibility of alloy 718 in Light Water Reactor environment

Galliano¹,

Andrieu

Cloué³

et al. 2017

International Journal of Hydrogen Energy

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“…Some authors have reported only HE for specimens mechanically loaded at relatively low temperature (below 150 1C) [7][8][9]17]. However, others have shown that the effect of HE could be extended at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of trapping and temperature on the hydrogen embrittlement susceptibility of alloy 718

Galliano

Andrieu

Blanc

et al. 2014

Materials Science and Engineering: A

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International audienceNi-based alloy 718 is widely used to manufacture structural components in the aeronautic and nuclear industries. Numerous studies have shown that alloy 718 may be sensitive to hydrogen embrittlement. In the present study, the susceptibilities of three distinct metallurgical states of alloy 718 to hydrogen embrittlement were investigated to identify both the effect of hydrogen trapping on hydrogen embrittlement and the role of temperature in the hydrogen-trapping mechanism. Cathodic charging in a molten salt bath was used to saturate the different hydrogen traps of each metallurgical state. Tensile tests at different temperatures and different strain rates were carried out to study the effect of hydrogen on mechanical properties and failure modes, in combination with hydrogen content measurements. The results demonstrated that Ni-based superalloy 718 was strongly susceptible to hydrogen embrittlement between 25 °C and 300 °C, and highlighted the dominant roles played by the hydrogen solubility and the hydrogen trapping on mechanical behavior and fracture modes

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“…The strength increased in order 455 • C < 482 • C < 510 • C at 1, 2, 4 h aging respectably showing that the discrepancy in strength was going from 1 to 4 h, it showed almost same strength at 8 h regardless of aging temperature at last. These results could be analyzed and had a good agreement that the higher aging temperature, the shorter aging time, and the aged strength decreased at high temperature and over suitable time on the contrary [11,12]. The overall tendency in case of 0.03% and 0.06% Nb specimen was similar to the 0.00% Nb content showing that tensile and yield strength was lowest at 510 • C for 8 h caused by the over aging.…”

Section: Effect On Micro-structure and Hardnessmentioning

confidence: 52%