Effect of Al addition on Nb-rich phase precipitation behavior in ferritic stainless steel

被引：2

作者：

Jiang, Mingkun ^{[1
,2
,3
]}

Han, Ying ^{[1
,2
,3
]}

Zu, Guoqing ^{[1
,2
,3
]}

Zhu, Weiwei ^{[1
,2
,3
]}

Yang, You ^{[1
,2
,3
]}

Ran, Xu ^{[1
,2
,3
]}

机构：

[1] Changchun Univ Technol, Key Lab Adv Struct Mat, Minist Educ, Changchun 130012, Peoples R China

[2] Changchun Univ Technol, Sch Mat Sci & Engn, Changchun 130012, Peoples R China

[3] Changchun Univ Technol, Jilin Prov Key Lab Adv Mat Proc & Applicat Rail Tr, Changchun 130012, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 28卷

基金：

中国国家自然科学基金;

关键词：

Aging precipitation; Nb-rich phase; Alloying; Ferritic stainless steel; Coarsening; MECHANICAL-PROPERTIES; LAVES PHASE; MICROSTRUCTURAL EVOLUTION;

D O I：

10.1016/j.jmrt.2023.12.055

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation behavior of Nb-rich phase in Al-free and 1Al Nb-bearing ferritic stainless steels (FSSs) at 700 degrees C were investigated. The results show that Nb-bearing carbides and Laves phases with mutual transformation relationships are precipitated in both Al-free and 1Al Nb-bearing FSSs at the early stage of aging. At this stage, the coarsening rate of Laves phase is higher than that of Nb2C phase, and the addition of Al can promote the precipitation of Laves phase and weaken the precipitation of (Nb, Ti)2C phase. As the aging time extended to 60 min, the Nb-rich phase in the two experimental steels was mainly Laves phase, and the intragranular Laves phase showed feather like aggregation distribution. On the one hand, the added Al can be enriched in the Laves phase to produce a tailing morphology, on the other hand, it can reduce the diffusion rate of Nb atoms in the matrix, thereby weakening the aggregation state of the intragranular Laves phase. During the coarsening process of Laves phase, the addition of Al can reduce the coarsening rate of Laves phase by 7.45 times.

引用

页码：782 / 788

页数：7

共 29 条

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