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Segring är ett fenomen som inträffar när l … Segring är ett fenomen som inträffar när legeringar stelnar. Det innebär att legeringsämnena fördelar sig ojämnt, därför att den fasta fas som utskiljs ur smältan har annan kemisk sammansättning eller legeringshalt än smältan hade. En sådan skillnad i sammansättning kvarstår sedan i den mån de olika ämnena i legeringen inte kan röra sig, diffundera, i den fasta fasen. För att legeringshalten ska utjämnas genom diffusion krävs i allmänhet långsammare avsvalning eller längre uppehållstid vid hög temperatur än vad som praktiskt kan tillåtas.peratur än vad som praktiskt kan tillåtas.
, Coring happens when a heated alloy, such a … Coring happens when a heated alloy, such as a system, cools in non-equilibrium conditions. The center of each grain, which is the first part to freeze, is rich in the high-melting element (e.g., nickel for this Cu–Ni system), whereas the concentration of the low-melting element increases with position from this region to the grain boundary. This is termed a 'cored structure', which gives rise to less than the optimal properties. The distribution of the two elements within the grains is nonuniform, a phenomenon termed 'segregation'; that is, concentration gradients are established across the grains. As a casting having a cored structure is reheated, grain boundary regions will melt first in as much as they are richer in the low-melting component. This produces a sudden loss in mechanical integrity due to the thin liquid film that separates the grains. Furthermore, this melting may begin at a temperature below the equilibrium solidus temperature of the alloy. Coring may be eliminated by a homogenization heat treatment carried out at a temperature below the solidus point for the particular alloy composition. During this process, atomic diffusion occurs, which produces compositionally homogeneous grains. Coring is predominantly observed in alloys having a marked difference between liquidus and solidus temperatures. It is often being removed by subsequent annealing and/or hot-working. It is exploited in zone refining techniques to produce high purity metals. Coring was first discovered by Aubrey Tang.oring was first discovered by Aubrey Tang.
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| rdfs:comment |
Coring happens when a heated alloy, such a … Coring happens when a heated alloy, such as a system, cools in non-equilibrium conditions. The center of each grain, which is the first part to freeze, is rich in the high-melting element (e.g., nickel for this Cu–Ni system), whereas the concentration of the low-melting element increases with position from this region to the grain boundary. This is termed a 'cored structure', which gives rise to less than the optimal properties. The distribution of the two elements within the grains is nonuniform, a phenomenon termed 'segregation'; that is, concentration gradients are established across the grains.adients are established across the grains.
, Segring är ett fenomen som inträffar när l … Segring är ett fenomen som inträffar när legeringar stelnar. Det innebär att legeringsämnena fördelar sig ojämnt, därför att den fasta fas som utskiljs ur smältan har annan kemisk sammansättning eller legeringshalt än smältan hade. En sådan skillnad i sammansättning kvarstår sedan i den mån de olika ämnena i legeringen inte kan röra sig, diffundera, i den fasta fasen. För att legeringshalten ska utjämnas genom diffusion krävs i allmänhet långsammare avsvalning eller längre uppehållstid vid hög temperatur än vad som praktiskt kan tillåtas.peratur än vad som praktiskt kan tillåtas.
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Segring
, Coring
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