热老化温度对高Si含量F/M钢中Laves相析出行为和冲击性能的影响

周军; 邱绍宇; 邱日盛; 曾文; 王浩; 舒茗; 杨灿湘

doi:10.13832/j.jnpe.2022.05.0126

热老化温度对高Si含量F/M钢中Laves相析出行为和冲击性能的影响

doi: 10.13832/j.jnpe.2022.05.0126

周军^1,,
邱绍宇^1, ,,
邱日盛²,
曾文²,
王浩¹,
舒茗¹,
杨灿湘¹

1.
中国核动力研究设计院核燃料元件及材料研究所，成都，610213
2.
重庆大学材料科学与工程学院，重庆，400045

基金项目: 中核集团集中研发项目“铅铋合金冷却反应堆技术”

详细信息

作者简介:
周　军（1984—），男，博士研究生，现主要从事核燃料及结构材料研究，E-mail: 330921035@qq.com

通讯作者:
邱绍宇，E-mail: fmkl@npic.ac.cn

中图分类号: TL34
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-11
- 修回日期: 2022-07-27
- 刊出日期: 2022-10-12

Effect of Thermal Aging Temperature on Precipitation Behavior of Laves Phase and Impact Performance in High Si Content Ferritic Martensitic Steels

1.
Nuclear Fuel and Material Institute, Nuclear Power Institute of China, Chengdu, 610213, China
2.
College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China

摘要

摘要: 铁素体马氏体钢（F/M钢）是铅冷快堆堆芯的主要候选材料之一，提高材料中的Si含量可提高其抗腐蚀性能，但同时会促进Laves相的析出从而影响材料韧塑性。针对一种Si含量为0.98%的F/M钢，开展了3种温度（500、550、600℃）下5000 h的热老化实验，研究了温度对Laves相析出行为和冲击性能的影响。结果表明，热老化温度升高能够促进Laves相的形核和粗化，且温度从550℃提高至600℃，Laves相的粗化速率从3.7 nm/h^1/3提高至9.0 nm/h^1/3。另一方面，热老化温度升高将加速冲击性能的退化，在550℃和600℃下热老化500 h，冲击功（A_KV）值分别下降至热老化前的51%和39%，而在500℃下热老化2500 h，A_KV值仍保持热老化前的75%。Laves相的析出与冲击性能退化有强烈的对应关系，是冲击性能退化的主要原因。
- 铁素体马氏体钢（F/M钢） /
- 高Si含量 /
- Laves相 /
- 冲击性能
Abstract: Ferritic martensitic steel (F/M steel) is one of the main candidate materials for lead-cooled fast reactor core. Increasing Si content can improve its corrosion resistance, but at the same time, it can promote the precipitation of Laves phase, thus affecting the toughness and plasticity of the material. For a F/M steel with a Si content of 0.98%, thermal aging experiments for 5000 h at three temperatures (500, 550 and 600℃) are carried out to study the effect of temperature on the precipitation behavior of Laves phase and impact performance. The results show that heating can promote the nucleation and coarsening of Laves phase, and with the temperature increasing from 550℃ to 600℃, the coarsening rate of Laves phase increases from 3.7 nm/h^1/3 to 9.0 nm/h^1/3. On the other hand, the increase of thermal aging temperature will accelerate the degradation of impact performance. After thermal aging at 550℃ and 600℃ for 500 h, the impact work (A_KV) decreases to 51% and 39% of that before thermal aging, respectively, while the A_KV value remains 75% of that before thermal aging for 2500 h at 500℃. The precipitation of Laves phase has a strong corresponding relationship with the degradation of impact performance, which is the main reason for the degradation of impact performance. egradation of impact performance.
- Ferritic martensitic steel (F/M steel) /
- High Si content /
- Laves phase /
- Impact performance

HTML全文

图 1 Z4在热老化前的背散射电子图

Figure 1. Backscattered Electron Image of Z4 before Thermal Aging

下载: 全尺寸图片幻灯片

图 2 Z4在500℃下热老化后的背散射电子图

Figure 2. Backscattered Electron Images of Z4 after Thermal Aging at 500℃

下载: 全尺寸图片幻灯片

图 3 Z4在550℃下热老化后的背散射电子图

Figure 3. Backscattered Electron Images of Z4 after Thermal Aging at 550℃

下载: 全尺寸图片幻灯片

图 4 Z4在600℃下热老化后的背散射电子图

Figure 4. Backscattered Electron Images of Z4 after Thermal Aging at 600℃

下载: 全尺寸图片幻灯片

图 5 不同热老化状态下Z4中Laves密度、面积分数、平均直径变化和粗化动力学方程曲线图

Figure 5. Curves of Laves Phase Density, Area Fraction, Average Diameter Change and Coarsening Kinetic Equation in Z4 under Different Aging Conditions

下载: 全尺寸图片幻灯片

图 6 Z4在600℃温度下热老化1000 h时Laves相的形貌和电子衍射图　　　　　　　

Figure 6. Images of Laves Phase Morphology and Electronogram of Z4 Thermal Ageing at 600℃ for 1000 h

下载: 全尺寸图片幻灯片

图 7 Z4在不同热老化温度下室温冲击功A_KV以及纤维断面率随热老化时间的变化曲线

Figure 7. Variation Curves of the Impact Energy A_KV at Room Temperature and Fiber Cross-sectional Rate with Aging Time under Different Aging Temperatures

下载: 全尺寸图片幻灯片

表 1 Z4的化学成分构成

Table 1. Chemical Composition of Z4

元素 Si C Cr Mo W V Mn Ni Fe

质量分数/% 0.98 0.21 9.68 1.00 0.79 0.20 0.87 0.56 —

　“—”表示未检测到该元素

下载: 导出CSV

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