The microstructure evolution of type 17-4PH stainless steel during long-term aging at 350○C
The microstructure evolution of type 17-4PH stainless steel during long-term aging at 350○C
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DOI：
10.1016/j.nucengdes.2006.03.017
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发表时间：
2006-12-01
影响因子：
1.7
通讯作者：
Shen, Baoluo
中科院分区：
文献类型：
--
作者：
Wang, Jun;Zou, Hong;Shen, Baoluo
采用x射线衍射和透射电镜研究了17-4沉淀硬化（17-4PH）不锈钢在350℃长期时效过程中的组织演变。结果表明：合金经固溶回火处理后，基体为板条马氏体，析出ε - cu相纳米颗粒；当合金在350℃时效至9个月时，形成了一些反向奥氏体，并且根据成熟过程，epsilon-Cu析出物逐渐变粗。当合金时效9 ~ 12个月时，析出大量次生碳化物M23C6。随着时效时间延长至15个月，在此中间温度下，基体中有一定量的反奥氏体转变，并在ε - cu析出物附近析出一种金属间化合物g相。(c) 2006 Elsevier B.V.版权所有
The microstructure evolution of 17-4 precipitation hardening (17-4PH) stainless steel during long-term aging at 350 degrees 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 epsilon-Cu phase after the alloy has been subjected to solution and temper treatment. When the alloy is aged at 350 degrees C to 9 months, some reversed austenite is formed and the epsilon-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 epsilon-Cu precipitates in the matrix at this intermediate temperature. (c) 2006 Elsevier B.V. All rights reserved.