摘要 :
By their very nature, empirical models must be treated with care in order to avoid predictions which are not physically possible. One example is the calculation of the Charpy impact toughness of steel welds as a function of compos...
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By their very nature, empirical models must be treated with care in order to avoid predictions which are not physically possible. One example is the calculation of the Charpy impact toughness of steel welds as a function of composition and processing, where the impact energy should not be negative. However, there is nothing to prevent a user from implementing inputs which lead to nonsensical results. We examine here whether a scheme used in kinetic theory can be generalized to create neural networks which are bounded. It is found that such procedures lead to bias. In the process of doing this work, some interesting trends have been discovered on the role of process parameters in determining the toughness of steel welds.
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摘要 :
The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M_s), as measured using dilatometry, with surface observations using confocal laser scann...
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The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M_s), as measured using dilatometry, with surface observations using confocal laser scanning microscopy. It is found that the proximity of the surface during confocal microscopy permits martensitic transformation to occur at a higher temperature with a reduced free energy change. This is because the strain energy from the shape deformation accompanying the growth of martensite is reduced at a free surface. The second observation is that plates of martensite tend to coalesce as they approach the free surface where there is reduced constraint. The general observations are backed by calculating the strain energy caused by a subsurface edge dislocation as a function of the orientation of its Burgers vector relative to the free surface.
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摘要 :
The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M_S), as measured using dilatometry, with surface observations using confocal laser scann...
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The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M_S), as measured using dilatometry, with surface observations using confocal laser scanning microscopy. It is found that the proximity of the surface during confocal microscopy permits martensitic transformation to occur at a higher temperature with a reduced free energy change. This is because the strain energy from the shape deformation accompanying the growth of martensite is reduced at a free surface. The second observation is that plates of martensite tend to coalesce as they approach the free surface where there is reduced constraint. The general observations are backed by calculating the strain energy caused by a subsurface edge dislocation as a function of the orientation of its Burgers vector . relative to the free surface.
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摘要 :The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (MS), as measured using dilatometry, with surface observations using confocal laser scanni...
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The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (MS), as measured using dilatometry, with surface observations using confocal laser scanning microscopy. It is found that the proximity of the surface during confocal microscopy permits martensitic transformation to occur at a higher temperature with a reduced free energy change. This is because the strain energy from the shape deformation accompanying the growth of martensite is reduced at a free surface. The second observation is that plates of martensite tend to coalesce as they approach the free surface where there is reduced constraint. The general observations are backed by calculating the strain energy caused by a subsurface edge dislocation as a function of the orientation of its Burgers vector relative to the free surface.
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摘要 :
The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M_S), as measured using dilatometry, with surface observations using confocal laser scann...
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The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M_S), as measured using dilatometry, with surface observations using confocal laser scanning microscopy. It is found that the proximity of the surface during confocal microscopy permits martensitic transformation to occur at a higher temperature with a reduced free energy change. This is because the strain energy from the shape deformation accompanying the growth of martensite is reduced at a free surface. The second observation is that plates of martensite tend to coalesce as they approach the free surface where there is reduced constraint. The general observations are backed by calculating the strain energy caused by a subsurface edge dislocation as a function of the orientation of its Burgers vector . relative to the free surface.
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摘要 :
An experiment is presented which succeeds for the first time in stimulating the formation of coarse plates of bainite by the coalescence of identically oriented individual platelets. Transformation under the influence of a tensile...
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An experiment is presented which succeeds for the first time in stimulating the formation of coarse plates of bainite by the coalescence of identically oriented individual platelets. Transformation under the influence of a tensile stress dramatically promotes the formation of the coalesced bainite by increasing the probability of growing parallel platelets in close proximity. Whereas the coarse plates are detrimental to toughness, the result serves to validate the mechanism of coalescence, which has been discussed extensively in the literature.
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