19 Cr 9 NiWMoNb鋼の応力緩和特性

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Hereunder is given a brief account of stress relaxation tests performed of 19 Cr 9 NiWMoNb steel within the temperature range from 600℃ to 700℃ with changing initial stress or strain. The experimental results were analyzed by using the parametric method proposed in our perevious papers. The conclusions obtained are as follows. (1) The stress relaxation experiment with uniformal initial stress or strain at a specific temperature range can be well combined into a single correlated curve termed as "Master relaxation curve", using parameter P=Log Et-Q/4.6 T (2) The stress relaxation experiment with uniformal testing temperature. but with a specific range af initial stress are as well correlated into a Master relaxation curve, using parameter π=Log t + m Log σ. (3) Temperature dependence of relaxation rate ε^・_<rp> defined by the so-called rate process with an apparent activation energy about 138 kcal/mole within the range of 625-700℃. But ε^・_<rp> at 600℃ is one 30th as large as the value extrapolated from the above mentioned activation process. This is thought to arise from the heavy locking action of precipitates to the dislocations under these low temperature region. (4) The so-called Smith's relationship, that is linear relationship between logarithm of time for a specific stress fall and temperature, is also deduced from our parametric relationship between P and X, disregarding the temperature dependence of Young's modulus.
社団法人日本材料学会の論文
1970-03-15

19 Cr 9 NiWMoNb鋼の応力緩和特性

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