In Situ Characterization of 17-4PH Stainless Steel by Small-Angle Neutron Scattering.

In Situ Characterization of 17-4PH Stainless Steel by Small-Angle Neutron Scattering.
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DOI:
10.3390/ma16165583
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发表时间:
2023-08-11
期刊:
影响因子:
3.4
通讯作者:
Wang, Shuanzhu
Wang, Shuanzhu
中科院分区:
材料科学3区
文献类型:
--
作者:
Yan, Shibo;Wang, Zijun;Li, Tianfu;Chen, Zhong;Du, Xiaoming;Liu, Yuntao;Chen, Dongfeng;Sun, Kai;Liu, Rongdeng;Bai, Bing;He, Xinfu;Liu, Kaitai;Wang, Shuanzhu

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17-4PH马氏体钢是核电站中常用的阀杆材料,长期在高温高压环境中服役,易发生热时效脆化。在这里,我们的特点是在17-4PH钢的纳米尺度的微观结构的演变,原位小角中子散射(SANS)与热-机械耦合加载装置。该装置可以设置不同的温度和张力,使原位SANS实验可以动态表征纳米结构变化的过程。结果表明,随着时效时间的延长,在475 °C和590 °C时效时,ε-Cu相析出并长大,在475 °C时效时,ε-Cu相为球形,而在590 °C时效时,ε-Cu相变为细长圆柱形。此外,在475 °C时,加载应力有助于ε-Cu相的生长。
17-4PH martensitic steel is usually used as valve stems in nuclear power plants and it suffers from thermal aging embrittlement due to long-time service in a high-temperature and high-pressure environment. Here, we characterized the evolution of microstructures at the nano-scale in 17-4PH steel by in situ small-angle neutron scattering (SANS) with a thermo-mechanically coupled loading device. The device could set different temperatures and tensile so that an in situ SANS experiment could dynamically characterize the process of nanoscale structural changes. The results showed that with increasing thermal aging time, the ε-Cu phase precipitates and grows as the temperature is 475 °C and 590 °C, and the ε-Cu phase is spherical at 475 °C but became elongated cylinders at 590 °C. Moreover, the loading stress could aid in the growth of the ε-Cu phase at 475 °C.
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影响因子: 1.2
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