Abstract
To investigate the changes in hydrogen embrittlement (HE) resistance of China Low Activation Martensitic (CLAM) steel during thermal aging, CLAM steels were aged at 550 °C and 600 °C up to 5000 h. The evolution of microstructure, including the evolution of subgrains, the growth of M23C6 carbides and MX carbonitrides, as well as the formation of Laves phase, were carefully characterized. The observed trend revealed an initial increase followed by a subsequent decrease in HE resistance upon prolonged aging durations. The mechanisms for changes in HE resistance were analyzed based on the orientation relationship between precipitates and matrix.
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