Abstract
For the first time, the nucleation site and the formation sequence of secondary phases during isothermal high-temperature (600 °C) aging process of a wire arc additively manufactured PH13–8Mo martensitic stainless steel were investigated herein. The microstructural characterizations revealed that the aging process starts with the nucleation of homogenously distributed spherical nano-sized β-NiAl phase within the martensite laths, followed by the formation of ellipsoidal M23C6 carbides, which promoted the formation of reverted austenite within the martensite laths and also along the lath boundaries at intermediate aging times. Lastly, new M23C6 carbides were formed within the reverted austenite at the final stage of the aging process.
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