Toughening Behavior in Alloy 617 with Long Term Ageing

Guo Cai Chai; Mattias Calmunger; Sten Johansson; Johan Moverare

doi:10.4028/www.scientific.net/SSP.258.302

Paper Titles

Micromechanism of Thermally Induced Breaking of One-Dimensional Nanocrystals
p.286

Numerical Determination of Fatigue Threshold from CTOD
p.290

Crystal Plasticity Simulations of Haynes 230, an Analysis of Single Crystal and Polycrystalline Experiments
p.294

Fatigue Crack Surface Topography after Plasma Nitriding Process
p.298

Toughening Behavior in Alloy 617 with Long Term Ageing
p.302

Surface Roughness Effects on the Fatigue Behavior of As-Machined Inconel718
p.306

Stress Intensity Factors for Rough Cracks Loaded in Mode II
p.310

Correlation of Fatigue Limit and Crack Growth Threshold Value to the Nanobainitic Microstructure
p.314

Study of Fracture Resistance of Nanolaminate Coatings Using Indentation and Impact Tests
p.318

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Toughening Behavior in Alloy 617 with Long Term Ageing

Abstract:

The influence of ageing at temperature 700°C for up to 20 000 hours on the deformation, damage and fracture behavior of Alloy 617 has been investigated by two toughness tests. Dense nano γ` phase and carbides are the main precipitates. However, the long-term aged material still shows high toughness. The mechanism has been studied using electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI). The results show that dense nano/micro-twins have been formed in the adjacent of the fracture front during the impact toughness or CTOD testing. Increase of ageing time reduces the number of nano/micro-twins, but they can be observed in all aged materials in spite of different strain rates. This indicates that besides dislocation slip, twinning is another deformation mechanism in long term aged material during the toughness tests. Formation of nano/micro-twins may be one of contributions to high toughness in the aged material, which is termed as twin induced toughening.

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Periodical:

Solid State Phenomena (Volume 258)

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302-305

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.258.302

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Online since:

December 2016

Authors:

Guo Cai Chai*, Mattias Calmunger, Sten Johansson, Johan Moverare

Keywords:

Twinning, Fracture Toughness, Impact Toughness, Long Term Ageing, Nickel Based Alloy

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