3 years ago

Compare the temperature dependence of Nabarro-Herring and Coble creep. Which is more temperature-sensitive

1 answer:

7 0

Lower temperatures favor Coble creep and higher temperatures favor Nabbaro–Herring creep because the activation energy for vacancy diffusion within the lattice is typically larger than that along the grain boundaries, thus lattice diffusion slows down relative to grain boundary diffusion with decreasing temperature.

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For a steel alloy it has been determined that a carburizing heat treatment of 15 h duration will raise the carbon concentration

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It is given that a carburizing heat treatment of 15 hour will raise the carbon concentration by 0.35 wt% at a point of 2 mm from the surface.

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we know that $\frac{x_1^2}{Dt}=constant$ where x is distance and t is time .As the temperature is constant so D will be also constant

So $\frac{x_1^2}{t}=constant$

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