<strong>Ce</strong>元素对<strong>316LN</strong>奥氏体不锈钢高温蠕变性能的影响

doi:10.11901/1005.3093.2023.170

材料研究学报

2024, Vol. 38

Issue (1): 23-32 DOI: 10.11901/1005.3093.2023.170

研究论文

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Ce元素对316LN奥氏体不锈钢高温蠕变性能的影响

杨仁贤¹^,², 马澍成¹^,², 蔡欣¹, 郑雷刚¹, 胡小强¹^,²(

), 李殿中¹^,²(

)

1 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016

Influence of Cerium on Creep Properties of 316LN Austenitic Stainless Steel

YANG Renxian¹^,², MA Shucheng¹^,², CAI Xin¹, ZHENG Leigang¹, HU Xiaoqiang¹^,²(

), LI Dianzhong¹^,²(

)

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

杨仁贤, 马澍成, 蔡欣, 郑雷刚, 胡小强, 李殿中. Ce元素对316LN奥氏体不锈钢高温蠕变性能的影响[J]. 材料研究学报, 2024, 38(1): 23-32.
Renxian YANG, Shucheng MA, Xin CAI, Leigang ZHENG, Xiaoqiang HU, Dianzhong LI. Influence of Cerium on Creep Properties of 316LN Austenitic Stainless Steel[J]. Chinese Journal of Materials Research, 2024, 38(1): 23-32.

全文: PDF(15630 KB) HTML

摘要:

采用蠕变持久试验机、扫描电子显微镜和透射电子显微镜等实验手段，系统研究了Ce元素添加对316LN奥氏体不锈钢(316LN钢)高温蠕变行为和微观组织的影响。结果表明，添加0.032%的Ce元素使316LN钢的蠕变断裂寿命显著提高。在温度为700℃、载荷为150 MPa的条件下，添加0.032%Ce元素的316LN钢蠕变寿命为555.5 h，比不添加Ce元素时的蠕变寿命312.6 h提高了78%。在温度为600~700℃、载荷为150~200 MPa的条件下，未添加Ce元素和添加0.032%Ce元素的316LN钢对应的蠕变应力指数分别为7.64和9.07，蠕变激活能分别为415.3 kJ/mol和454.8 kJ/mol，蠕变门槛应力分别为61.7 MPa和76.6 MPa。蠕变断裂后的微观组织表明，添加0.032%的Ce元素显著促进了蠕变过程中316LN钢晶内Laves相的析出。晶内细小弥散分布的Laves相，在蠕变过程中能够阻碍位错移动，提高基体的蠕变抗力，从而有效改善蠕变性能。

关键词 ：金属材料, 316LN奥氏体不锈钢, 高温蠕变, 稀土Ce, 析出强化

Abstract：

316LN austenitic stainless steel (316LN steel) is widely used as structural components in nuclear industries for their excellent corrosion resistance and high temperature mechanical properties. With the development of next-generation nuclear reactors, it is imperative to improve the high temperature creep properties of 316LN steel to warrant the corresponding components being subjected to higher temperatures. Alloying with rare earth (RE) elements, such as Cerium (Ce), are considered as a promising approach to enhance creep properties of the austenitic stainless steels. However, the effect of Ce on the microstructure evolution and creep performance of 316LN steel have not been reported. In this study, the effect of Ce on creep behavior and microstructure of 316LN steel in the temperature range 600^oC to 700^oC and stresses range150 MPa to 200 MPa was investigated by electronic creep tester, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the addition of 0.032%Ce could significantly improve the creep rupture life of 316LN steel. For instance, at 700^oC/150 MPa, the creep life of 316LN steel with 0.032%Ce prominently increased from 313 h to 556 h. The creep stress exponent, activation energy and threshold stress of 316LN steel without Ce were found to be 7.64, 415.3 kJ/mol and 61.7 MPa, respectively, whereas those of 316LN steel with 0.032%Ce addition were corresponding to 9.07, 454.8 kJ/mol and 76.6 MPa. The creep mechanism of those two 316LN steels were also controlled by dislocation climbing. The addition of 0.032%Ce has not changed the creep mechanism of 316LN steel but clearly raised the creep activation energy and threshold stress. Furthermore, microstructural analysis demonstrates that the addition of 0.032%Ce may obviously promote the precipitation of Laves phase within the matrix. These intragranular Laves phases could inhibit the movement of dislocations during creep deformation, notably enhancing the creep resistance of the matrix. Therefore, the addition of 0.032%Ce remarkably improved the creep properties of 316LN steel by intragranular Laves precipitation strengthening.

Key words： metallic materials 316LN austenitic stainless steel creep cerium precipitation strengthening

收稿日期: 2023-03-15

ZTFLH:

TG142.1

基金资助:国家重点研发计划(2020YFB2006800);中国科学院青年创新促进会优秀项目(Y2021060);沈阳市中青年科技创新人才支持计划项目(RC220474)

通讯作者: 胡小强，研究员，xqhu@imr.ac.cn，研究方向为稀土特殊钢研发与应用;
李殿中，研究员，dzli@imr.ac.cn，研究方向为先进钢铁材料研发与应用

Corresponding author: HU Xiaoqiang, Tel: (024)23971127, E-mail: xqhu@imr.ac.cn;
LI Dianzhong, Tel: (024)23971281, E-mail: dzli@imr.ac.cn

作者简介: 杨仁贤，男，1994年生，博士生

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表1 两种316LN奥氏体不锈钢的主要化学成分

图1 不同温度和应力条件下0Ce和32Ce钢的蠕变应变曲线和蠕变速率曲线

图2 0Ce和32Ce钢的最小蠕变速率与蠕变应力、温度倒数的对数曲线

图3 0Ce和32Ce钢在700℃不同应力蠕变断裂后的SEM微观组织

图4 700℃、150 MPa条件蠕变断裂后0Ce钢晶界处析出相的TEM图像和Mo、Cr元素的面分布

表2 316LN奥氏体不锈钢蠕变析出相的化学成分

图5 700℃、150 MPa条件蠕变断裂后32Ce钢晶界处析出相的TEM图像和Cr、Mo元素面分布

图6 700℃、200 MPa和150 MPa条件蠕变断裂后32Ce钢晶内析出相的TEM图像和元素分析

图7 0Ce和32Ce钢在700℃、150 MPa实验条件中断蠕变后的SEM微观组织

图8 0Ce和32Ce钢在700℃最小蠕变速率的1/5次方随蠕变应力的变化

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