High temperature-high strain rate fracture of inconel 600

Shapiro, E. Ya.; Dieter, George E.

doi:10.1007/bf02642021

Cited by 57 publications

(18 citation statements)

References 5 publications

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“…Although the propagation of cracks is restrained in hot forming because there exists a healing process while cracks initiate [1], some cracks are still left in the formed workpieces. The situation is usually more severe in cold-formed workpieces.…”

Section: Introductionmentioning

confidence: 99%

A study on crack healing in 1045 steel

Wei

Han

Jiang

et al. 2006

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

A study on crack healing in 1045 steel

Wei

Han

Jiang

et al. 2006

Journal of Materials Processing Technology

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“…Sintering of creep-induced grain boundary cavities was carried out in 316 stainless steel by annealed, hotisostatically pressured and compressive creep at 750 °C [16]. The propagation of damage is restrained in metal during hot deformation, which means that there exists a healing process, while the cracks extend [17]. One of the reasons why the ductility of experimental steels can be improved over the whole working temperature is to annihilate or heal micro-cracks that may occur during deformation [18].…”

Section: Introductionmentioning

confidence: 99%

Modelling of the evolution of crack of nanoscale in iron

Wei

Jiang

Han

2013

Computational Materials Science

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Metal owns the ability of self-healing to some extent, and the ability of the internal crack healing is most desirable for improving the reliability of metal. A molecular dynamics simulation has been further developed to investigate the evolution of a nanoscale crack in body centred cubic Fe crystal under the conditions of heating or compressive pressure. When system temperature drops, the evolution of the crack that was at elevated temperature has been studied for the first time. N-body potential according to the embedded atom method has been adopted. The original nanoscale crack is expressed by removing some atoms in the centre of the cell, and the minimum vertical distance between the atoms on the top and bottom crack surfaces has been defined as Dm for assessing the process of crack evolution. The results show that a crack healing process can be accelerated significantly with an increase of temperature. When the system temperature decreases, Dm of the crack that was in healing process does not change significantly but fluctuates in a narrow range. This means that the crack healing is the result of Fe atoms diffusing into the crack area but not the thermal stress incurred in the simulation cell at elevated temperature. The pre-compressive pressure under the condition of both biaxial and uniaxial loadings can help promote the crack healing significantly and results in more uniform distribution of defects after healing. AbstractMetals own the ability of self-healing to some extent, and the ability of the internal crack healing is most desirable for improving the reliability of metals. A molecular dynamics simulation has been further developed to investigate the evolution of a nano scale crack in body centred cubic Fe crystal under the conditions of heating or compressive pressure. When system temperature drops, the evolution of the crack that was at elevated temperature has been studied for the first time. N-body potential according to the embedded atom method has been adopted. The original nano scale crack is expressed by removing some atoms in the centre of the cell, and the minimum vertical distance between the atoms on the top and bottom crack surfaces has been defined as D m for assessing the process of crack evolution. The results show that a crack healing process can be accelerated significantly with an increase of temperature. When the system temperature decreases, D m of the crack that was in healing process does not change significantly but fluctuates in a narrow range.This means that the crack healing is the result of Fe atoms diffusing into the crack area but not the thermal stress incurred in the simulation cell at elevated temperature. The pre compressive pressure under the condition of both biaxial and uniaxial loadings can help promote the crack healing significantly and results in more uniform distribution of defects after healing.

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“…These tests cannot cover the entire range of stress states needed for application to metal forming processes. Therefore, other tests such as compression and torsion with superimposed tension or compression [13] are used to obtain a reliable fracture criterion for hot metal forming processes. Moreover, for such processes fracture criteria should account for temperature and strain rate.…”

Section: Introductionmentioning

confidence: 99%