The microstructure evolution of type 17-4PH stainless steel during long-term aging at 350°C
2006; Elsevier BV; Volume: 236; Issue: 24 Linguagem: Inglês
10.1016/j.nucengdes.2006.03.017
ISSN1872-759X
AutoresJun Wang, Hong Zou, Cong Li, Peng Yanhua, Shaoyu Qiu, Shen Bao-luo,
Tópico(s)Hydrogen embrittlement and corrosion behaviors in metals
ResumoThe microstructure evolution of 17-4 precipitation hardening (17-4PH) stainless steel during long-term aging at 350 °C was studied mainly by X-ray diffraction and transmission electron microscopy. The results showed that the matrix is lath martensite and the precipitation of nano-metric particles of ɛ-Cu phase after the alloy has been subjected to solution and temper treatment. When the alloy is aged at 350 °C to 9 months, some reversed austenite is formed and the ɛ-Cu precipitates are coarsening according to ripening process. When the alloy aged from 9 to 12 months, some bulk secondary carbides, M23C6, are precipitated. With the age time extended to 15 months, an amount of reversed austenite is transformed and the G-phase, a kind of intermetallic compound, precipitation occurs nearby the ɛ-Cu precipitates in the matrix at this intermediate temperature.
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