At 873K, specimens of 9Cr-lMo steel were prepared by the interrupted test to simulate various creep states. Then, the X-ray diffraction (XRD) measurement was introduced to characterize the dislocation evolution during creep. The experiment results revealed that the creep strain obtained by the interrupted test is greatly consistent with that of continuous test. Based on the analysis of square of lattice strain, it indicated that the total dislocation density decreases and reaches the half of initial value at the primary stage of creep.
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