稀土铈对铸态Mn18Cr18N高氮奥氏体不锈钢热变形行为的影响

李毓硕; 董艳伍; 姜周华; 汤庆飞; 杜书扬; 侯志文

doi:10.1007/s12613-021-2355-6

Volume 30 Issue 2

Feb. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(2): 324-334

Yushuo Li, Yanwu Dong, Zhouhua Jiang, Qingfei Tang, Shuyang Du, and Zhiwen Hou, Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 324-334. https://doi.org/10.1007/s12613-021-2355-6

Cite this article as:

Yushuo Li, Yanwu Dong, Zhouhua Jiang, Qingfei Tang, Shuyang Du, and Zhiwen Hou, Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 324-334. https://doi.org/10.1007/s12613-021-2355-6

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研究论文

稀土铈对铸态Mn18Cr18N高氮奥氏体不锈钢热变形行为的影响

1)
东北大学冶金学院, 沈阳 110819, 中国
2)
东北大学轧制技术及连轧自动化国家重点实验室, 沈阳 110819, 中国

通讯作者:
董艳伍 E-mail: dongyw@smm.neu.edu.cn

姜周华 E-mail: jiangzh@smm.neu.edu.cn

文章亮点

(1) 系统研究了Ce元素对铸态Mn18Cr18N高氮奥氏体不锈钢热变形行为的影响。

(2) 阐述了Ce元素对Mn18Cr18N钢夹杂物的改性和改性前后热变形行为的差异。

(3) 阐述了Ce元素偏聚对Mn18Cr18N钢铸态组织和热变形组织的影响。

中文摘要

通过热压缩试验研究了Mn18Cr18N和Mn18Cr18N+Ce高氮奥氏体不锈钢在1173–1473 K和0.01–1 s^–1下的热变形行为。并通过含Ce夹杂物和Ce元素偏析两个方面分析了Ce元素对合金热变形行为的影响机理。结果表明，添加Ce元素后，大尺寸、有棱角、硬且脆的夹杂物（TiN–Al₂O₃、TiN和Al₂O₃）可被变质为细小弥散的含Ce夹杂物（Ce–Al–O–S和TiN–Ce–Al–O–S）。在凝固过程中，含Ce夹杂物可作为非均匀形核点细化铸态晶粒。在热变形过程中，含Ce夹杂物可以抑制位错运动和晶界迁移，诱导动态再结晶（DRX）形核，避免显微裂纹和孔隙的形成和扩展。此外，在凝固过程中，Ce原子在固液界面前沿富集，导致成分过冷并细化二次枝晶。类似地，在热变形过程中，Ce原子倾向于在DRX晶粒的边界处偏析并抑制晶粒的生长。在含Ce夹杂物和Ce元素偏析的协同作用下，虽然合金的热变形抗力和热变形活化能升高，但更容易发生DRX且DRX晶粒尺寸明显细化，还可以缓解热变形开裂问题。最后，测量了样品的显微硬度。结果表明，与铸态试样相比，热变形试样的显微硬度显著提高，并且随着DRX程度的增加，显微硬度不断降低。此外，Ce元素也可以通过影响铸态组织和热变形组织来影响合金的显微硬度。

关键词:

Research Article

Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel

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Abstract

Abstract

The hot deformation behavior of Mn18Cr18N and Mn18Cr18N+Ce high nitrogen austenitic stainless steels at 1173–1473 K and 0.01–1 s^–1 were investigated by thermal compression tests. The influence mechanism of Ce on the hot deformation behavior was analyzed by Ce-containing inclusions and segregation of Ce. The results show that after the addition of Ce, large, angular, hard, and brittle inclusions (TiN–Al₂O₃, TiN, and Al₂O₃) can be modified to fine and dispersed Ce-containing inclusions (Ce–Al–O–S and TiN–Ce–Al–O–S). During the solidification, Ce-containing inclusions can be used as heterogeneous nucleation particles to refine as-cast grains. During the hot deformation, Ce-containing inclusions can pin dislocation movement and grain boundary migration, induce dynamic recrystallization (DRX) nucleation, and avoid the formation and propagation of micro cracks and gaps. In addition, during the solidification, Ce atoms enrich at the front of solid–liquid interface, resulting in composition supercooling and refining the secondary dendrites. Similarly, during the hot deformation, Ce atoms tend to segregate at the boundaries of DRX grains, inhibiting the growth of grains. Under the synergistic effect of Ce-containing inclusions and Ce segregation, although the hot deformation resistance and hot deformation activation energy are improved, DRX is more likely to occur and the size of DRX grains is significantly refined, and the problem of hot deformation cracking can be alleviated. Finally, the microhardness of the samples was measured. The results show that compared with as-cast samples, the microhardness of hot-deformed samples increases significantly, and with the increase of DRX degree, the microhardness decreases continuously. In addition, Ce can affect the microhardness of Mn18Cr18N steel by affecting as-cast and hot deformation microstructures.
- rare earth;
- hot deformation;
- Mn18Cr18N steel;
- non-metallic inclusions;
- element segregation;
- microhardness

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稀土铈对铸态Mn18Cr18N高氮奥氏体不锈钢热变形行为的影响

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中文摘要

Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel

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