応力緩和繰返し法による加工硬化実験

概要

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Repeated stress-relaxation of NaCl single crystals has been studied at room temperature. It has en found that the work-hardening during repeated stress relaxation can be analyzed in terms of two processes. One appears at the early part of each cycle and corresponds to the work-hardening at proceeds fast. This process depends on the time interval for relaxation, Δ_t, and the initially applied stress, σ_0, suggesting that the process is related to the relaxation. This process may be interpreted as follows : The immobilization and grouping of the dislocations proceed during the relaxation and the grouped dislocations are dispersed during the reloading process, causing the hardening at the early stage of the cycle experiment. The other process is independent of Δ_t and corresponds to the work-hardening that proceeds slowly with the cyclic stress. This type of hardeng is related to the active straining rather than the relaxation. During this process the dislocation density and inter-dislocation reaction increase with straining, This process may be explained using the assumption that the hardening coefficient, θ_γ, during the relaxation and the so-called rising coefficient, K, at the beginning of the restraining are constant.
社団法人日本材料学会の論文
1981-03-15