Secondary hardening in Co-Ni-Cr super-alloy investigated by Mechanical Spectroscopy

Cosimati, Raffaele; Mari, Daniele

doi:10.1016/j.msea.2016.03.091

Cited by 4 publications

(5 citation statements)

References 28 publications

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“…Indeed, after solution treatment, the microstructure appears free of texture, including twins. However, both CW and not-CW samples show the same TEP curves 6,7 , revealing the same precipitation stages.…”

Section: Resultsmentioning

confidence: 89%

“…3, a broad maximum placed between 550ºC and 600ºC characterizes the TEP curves of both the alloys "without" and "with" beryllium. Former experiments carried out on the same material allowed to relate this maximum on TEP to a precipitation process occurring up to 600ºC, followed by dissolution of such precipitates (hereafter referred as "A") 6,7 . Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…Previous investigations on the same alloys showed that thermal treatments at a temperature between 550ºC and 600ºC produced a precipitation responsible for a remarkable hardening by pinning dislocations 6,7 .…”

Section: Introductionmentioning

confidence: 92%

“…The experimental apparatus is described in detail elsewhere 7,13 . The sample is fixed at each end to the copper reference blocks maintained at temperatures 10ºC and 30ºC.…”

Section: Thermoelectric Powermentioning

confidence: 99%

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Hysteretic Behavior of Twin Boundary Peak Due to Precipitation in Co-Ni-Cr alloy

Cosimati

Mari

2018

Mat. Res.

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Anelastic behavior and microstructural changes of a Co-Ni-Cr super-alloy were monitored over the temperature range 250-950ºC, by using several complementary techniques. Two grades of this alloy were used, differing by the presence of small quantity of beryllium (<1.5% at.). Thermoelectric power reveals two distinct precipitation stages. The first precipitation ("A"), common to both the grades, and a second one ("B"), occurring solely in the beryllium-containing alloy. Cold-worked alloys exhibit a transient large mechanical loss peak, associated to the recrystallization of the deformed materials, and two relaxation peaks situated at around 600ºC (P1) and 780ºC (P2). Instead, only the peak P1 occurs on the fully recrystallized material. P1 and P2 can be associated to the diffusion process involved in the first precipitation stage ("A") and to the twin boundary motion, respectively. The precipitation-dissolution process of precipitates "B", localized on the twin boundary, provides a hysteretic behavior of the peak P2.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

“…The experimental apparatus is described in detail elsewhere 7,13 . The sample is fixed at each end to the copper reference blocks maintained at temperatures 10ºC and 30ºC.…”

Section: Thermoelectric Powermentioning

confidence: 99%

See 2 more Smart Citations

Hysteretic Behavior of Twin Boundary Peak Due to Precipitation in Co-Ni-Cr alloy

Cosimati

Mari

2018

Mat. Res.

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“…The IF of the austenitic alloy was explained by planar and wavy slip of dislocation. Mechanical spectroscopy of Co-Ni-Cr superalloy was investigated by Cosimati et al [5]. The internal friction of cold worked and annealed Co-Ni-Cr super-alloy samples were interpreted based on the G-L theory.…”

Section: Introductionmentioning

confidence: 99%

304L stainless steel fatigue evaluation using dynamic mechanical analysis

Rao

Shen

2018

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In order to evaluate the fatigue effects on 304L Stainless Steel, the internal friction or damping of the material have been investigated by means of dynamic mechanical analysis (DMA), using single cantilever test modes. Before DMA measurement, the 304L plates are loaded with different cycle number and stress amplitude to simulate different fatigue condition. The amplitude dependant internal friction (ADIF) of 304L small sample is measured. It shows that the ADIF curves of DMA are associated with the pre-fatigue loading. One ADIF peak is observed near the critical strain amplitude. The DMA data of different pre-stressed samples (cyclic stress amplitude from ±80MPa to ±200MPa) show that the height of ADIF peak increases with the pre stress value. The mechanism of the peak is discussed in the paper. The results indicate that a clear correlation exists between fatigue condition and internal friction curve, so that the fatigue behaviour of 304L stainless steel can be evaluated from DMA measurements.

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