Abstract
To evaluate the thermal aging embrittlement in the main coolant pipe material of nuclear power plants, a series of small punch testes at room temperature were performed on Z3CN20.09M duplex stainless steel aged at 400°C for up to 10000 hours, and then the fractured specimens were examined by the SEM. The test results indicate that the aging heat treatment led to a slight increase of the strength, and caused an initial increase on the small punch energy followed by continual decrease when the aging time extends 1000 hours. Besides, the fracture mode of specimens aged at 400°C for different time exhibited some discrepancy, but the difference is not clearly to reflect the thermal aging effect on the material.
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