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I know nothing about stainless steels, but in Al-Mg alloys there is similar phenomenon, i.e., low temperature annealing -> YPE, high temperature annealing + slow cooling -> YPE, but high temperature annealing + fast cooling -> no YPE. We explain the phenomenon like this: high temperature annealing generates many dislocations and they are retained during fast cooling, upon tensile testing, these dislocations act as "free" initial dislocations so that YPE is avoided. The dislocation density is a function of the annealing temperature, the higher the T, the more dislocations. If the annealing temperature is not high enough, you do not have enough "free" dislocations so that YPE appears. |

10Â¥2010-12-02 13:16:09















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