Abstract
The tensile test of 304 stainless steel on which copper and constantan wires were welded to constitute a thermocouple was done to clear the effect of heat generation due to plastic deformation on current density in H2SO4-NaCl solution at −300 mV (vs SCE).
The temperature and current density of specimens during plastic deformation increased with increasing strain and strain rate. A linear relationship was obtained between logarithm of increased current density with deformation in each strain and real specimen temperature which rised temperature with deformation was added to solution temperature. From this relation, the ratio R of current density due to rised temperature with deformation to current density at real specimen temperature during plastic deformation increased with increasing strain and strain rate \dotε. Relationships between R and \dotε in each strain were obtained for the strain rate range from 5.6×10−3s−1 to 1.1×10−1s−1 as the following equations.
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oindentThis rised temperature during plastic deformation did not detect under the strain rate of 5.6×10−5s−1. But it was thought that strain rate at crack tips remarkably increased after crack initiation. Therefore, it is suggested that heat generation due to plastic deformation does not affect to the process of crack initiation but is able to affect to the process of crack propagation in stress corrosion cracking.
