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通过现场测试对改进的25Ni-20Cr钢的微观结构和机械性能进行研究

Penghui Lei¹, Xiaoyu Ji¹, Jiahao Chen¹

¹School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.

Nanomaterials (Basel, Switzerland)

|March 26, 2025

概括

微合金增强了25Ni-20Cr奥氏体不钢 (N-S35140) 用于第四代反应堆. 这种改进的钢具有优越的高温机械性能,使其适用于苛刻的核应用.

科学领域:

材料科学材料科学材料科学
金工程金工程金工程
核工程核工程是指核工程.

背景情况:

25Ni-20Cr (S35140) 奥氏体不钢的高温机械性能对于第四代核反应堆结构部件至关重要.
改善这些特性对于满足先进的应用要求至关重要.

研究的目的:

研究一种从S35140中衍生而来的改进的奥氏体不钢 (N-S35140).
评估 (Ti) 微合金在高温下对钢的微观结构和机械性能的影响.

主要方法:

使用扫描传输电子显微镜 (STEM) 来分析沉物形成.
在室温下进行现场传输电子显微镜 (TEM) 压缩试验.
在现场扫描电子显微镜 (SEM) 进行了在650°C的拉力测试.

主要成果:

添加Ti导致N-S35140中强化纳米相 (M,C,N,MC,MN,Ti,C,N) 的沉.
与S35140.0相比,N-S35140在室温下表现出优越的机械性能.
在650°C时,N-S35140的抗拉强度为330.6 MPa,屈服强度为228.2 MPa,延长率为51.4%.

结论:

新的增强纳米相有效地弥补了减少的碳含量,提高了高温强度.
N-S35140钢具有显著增强的机械性能,性能优于原始的S35140钢.
由于其性能提高,N-S35140是第四代核反应堆结构部件的有希望的候选者.

关键词:

第四代核反应堆的核反应堆 N-S35140 奥氏体钢的使用情况在现场拉伸性试验中SEM 在现场压缩试验中进行TEM压缩试验.机械性能机械性能机械性能

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