1Cr-1/2Mo-1/4V鋼の応力緩和特性

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Although it is important from the practical standpoint to study the effect of the initial stress of practical heat resisting steel on its stress relaxation properties. and to find thereby the phenomenological correlation between its initial stress and residual stress. it is regrettable that no systematic investigation on this problem has so far been made beyond 0ding's works. Report is made in this paper of the examination made of the effect of the initial stress of 1 Cr-1/2 M0-1/4 V steel on its residual stress based on Oding's rule by varying the initial stress within the temperature range of 50-550℃ . The temperature dependence of stress relaxation rate was also discussed here. The results obtained are as follows ; (1) The initial stress in the lower temperature range gives effect of different order on the residual stress from the effect that will be given by the initial stress in the higher temperature range. The relaxation behavior of the residual stress may even be greater when the initial stress was in be lower temperature range than what might have been expected from the property of the initial tress which was in the higher temperature range. (2) Accordingly the so-called 0ding's correlation between σ_0 and Δσ ( = σ_0-σ_t) fails in this kind f low alloy steels. but is possible of success in the kinds of high chromium ferritic and austenitic steels. (3) The temperature dependence of stress relaxation rate ε^^・_<rp> for the data with same initial train 0. 15% within the temperature range of 450-550℃ is represented experimentally as follows. [numerical formula] where, σ ; stress (kg/mm^2), R ; gas constant (cal/mole/deg), and T ; test temperature (^.K).
社団法人日本材料学会の論文
1969-11-15

1Cr-1/2Mo-1/4V鋼の応力緩和特性

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