Influence Mechanism of Boron Addition on the Precipitation Behavior of Super Austenitic Stainless Steel S32654

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-08-10 DOI:10.1007/s12540-024-01772-z

Jiangtao Yu, Shucai Zhang, Huabing Li, Zhouhua Jiang, Hao Feng, Hongchun Zhu, Teng Ban, Tingyu Ren

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Abstract

The influence mechanism of Boron (B) addition on the precipitation behavior of S32654 was systematically investigated in this work. The results indicated that B significantly inhibited the nucleation and growth of σ phase through its non-equilibrium grain boundary segregation (NGS) at 1000 °C. The segregation of B at grain boundary (GB) decreased GB energy and suppressed Cr and Mo segregation, thus reducing the nucleation sites of intergranular σ phase. B also segregated at vacancies and dislocations during its reverse diffusion process, reducing the nucleation sites of intragranular σ. Meanwhile, B markedly decreased the nucleation rate of σ phases. In addition, B inhibited the growth of σ phase through segregation at σ/γ interface. Under the combined inhibitory effects of B, the precipitation of σ phase was markedly suppressed. By comparation, the addition of B has little effect on the precipitation of Cr₂N. B decreased the nucleation position but accelerated the nucleation rate. Under the joint action of these two opposing factors, the nucleation ability of Cr₂N has not significantly changed. Additionally, the segregation tendency of B at Cr₂N/γ interfaces was weak, leading to a little inhibition effect on the Cr₂N growth. Therefore, the precipitation tendency of Cr₂N in B-bearing and B-free steels was basically the same.

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加硼对超级奥氏体不锈钢 S32654 沉淀行为的影响机理

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.