In-situ Observation of Point Defect and Precipitate Evolvement of CLAM Steel under Electron Irradiation

doi:10.1016/j.jmst.2013.02.015

Abstract

Abstract:

The point defect and precipitate evolution of China low activation martensitic steel (CLAM) under electron beam irradiation were characterized by high voltage electron microscopy. The process was recorded in-situ on electron-sensitive films. The irradiation dose rate was 1.78 × 10⁻³ dpa/s and the highest dose was 2.12 dpa/s. Irradiation introduced dislocation loops into the sub-grain, which increased density when the irradiation dose was increased from 0.53 dpa to 1.59 dpa at 723 K. The precipitate, found to be an M₆C type, was irradiated at 773 K at the [011] plane direction. The precipitate morphology and structure were unchanged when the irradiation dose was increased to 2.12 dpa. Compared with the irradiation at 723 K in the sub-grain, no other defects were generated at the nearby grain boundary at 773 K.

Key words: Martensitic steel, Electron microscopy, Electron irradiation, Defect, Precipitate

Yong Xin, Tongda Ma, Xin Ju, Jie Qiu . In-situ Observation of Point Defect and Precipitate Evolvement of CLAM Steel under Electron Irradiation[J]. J. Mater. Sci. Technol., 2013, 29(5): 467-470.

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