Abstract
The creep behavior of materials under intermittent load is one of the most important and attractive problems in the field of physics and mechanics of engineering materials.
In order to investigate the creep mechanism of metallic materials under intermittent load at elevated temperature, it was intended to observe the structural change in 0.1%C steel during creep under static load, and the same change in the same material during creep under intermittent load, employing the X-ray diffraction technique.
As the results of this investigation, the following conclusions have been obtained,
(1) Deformation of transient creep which occurs during each reloading half-cycle is caused by the same mechanism, but this mechanism is found to be different from that of the transient creep in the case of the creep under static load.
(2) Half-value breadth of X-ray diffraction profile is found to be effective for characterizing the mechanical behavior of creep.
(3) The difference found in the half-value breadth change between the crept specimens under the static load and the same specimens under the intermittent load is correlated to the difference in the strain rate between these specimens.
