Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

doi:10.1088/1674-1056/ac744a

Abstract Precipitation in super-austenitic stainless steels will significantly affect their corrosion resistance and hot workability. The effects of Cr and Mo on precipitation behaviors were mainly achieved by affecting the driving force for precipitation, especially Mo has a more substantial promotion effect on the formation of the σ phase than Cr. In the present study, B addition to the S31254 super-austenitic stainless steels shows an excellent ability to inhibit precipitation. The effect of B on the precipitation behaviors was investigated by microstructure characterization and theoretical calculations. The experimental observation shows that the small addition of B inhibits the formation of the σ phase along grain boundaries and changes from continuous to intermittent distribution. Moreover, the inhibitory effect increased obviously with the increase of B content. The influence of B addition was theoretically analyzed from the atomic level, and the calculation results demonstrate that B can inhibit the formation of σ phase precipitates by suppressing Mo migration to grain boundaries. It is found that B and Mo are inclined to segregate at Σ 5 and Σ 9 grain boundaries, with B showing the most severe grain boundary segregation tendency. While B distribution at the grain boundary before precipitation begins, the segregation of Mo and Cr will be restrained. Additionally, B's occupation will induce a high potential barrier, making it difficult for Mo to diffuse towards grain boundaries.

Keywords: super-austenitic stainless steel precipitate segregation boron

Received: 28 February 2022
Revised: 26 May 2022
Accepted manuscript online: 29 May 2022

PACS:	64.75.Op	(Phase separation and segregation in alloying)
	68.35.bd	(Metals and alloys)
	73.20.-r	(Electron states at surfaces and interfaces)
	63.20.dk	(First-principles theory)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1860204 and 51871159).

Corresponding Authors: Jin-Yao Ma, Pei-De Han
E-mail: majinyao@tyut.edu.cn;hanpeide@tyut.edu.cn

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Pan-Pan Xu(徐攀攀), Jin-Yao Ma(马晋遥), Zhou-Hua Jiang(姜周华), Yi Zhang(张翊), Chao-Xiong Liang(梁超雄), Nan Dong(董楠), and Pei-De Han(韩培德) Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study 2022 Chin. Phys. B 31 116402

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Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

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