Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel

In this paper, in situ observation of the cooling process of the deposited metal of low nickel high nitrogen austenitic stainless steel obtained by laser-arc hybrid surfacing welding with shielding gas containing only Ar and only N2, respectively, is carried out using the ultra-high-temperature conf...

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Autores principales:	Yiming Ma, Xiaochun Lv, Naiwen Fang, Kai Xu, Xingxing Wang, Yicheng Yang, Hongliang An, Yan Zhang, Yinan Xu
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/4344df20f3b94b7db63552525feab392
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spelling	oai:doaj.org-article:4344df20f3b94b7db63552525feab3922021-11-29T00:56:21ZResearch on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel1687-844210.1155/2021/7655423https://doaj.org/article/4344df20f3b94b7db63552525feab3922021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7655423https://doaj.org/toc/1687-8442In this paper, in situ observation of the cooling process of the deposited metal of low nickel high nitrogen austenitic stainless steel obtained by laser-arc hybrid surfacing welding with shielding gas containing only Ar and only N2, respectively, is carried out using the ultra-high-temperature confocal laser scanning microscope (CLSM). An in-depth analysis of the microstructural changes is conducted with SEM, EDS, and EBSD. The results showed that the surface substructure is refined during crystallization with shielding gas Ar. However, grains are seriously coarsened in the δ phase area. Widmanstatten γ and intragranular γ are formed as a result of δ ⟶ γ phase transition through the shear-diffusion mechanism. In the cooling process with shielding gas N2, the temperature range of each phase area narrowed obviously. Blocky γ began to appear because of the δ ⟶ γ phase transition through the diffusion mechanism. Generally, Ar and N2 have a strong effect only on the very shallow range from the surface. The area with a larger local misorientation with shielding gas Ar is at lath γ on the surface. With shielding gas N2, the large local misorientation area is the last contact position of γ during the δ ⟶ γ phase transition on the surface and cross section.Yiming MaXiaochun LvNaiwen FangKai XuXingxing WangYicheng YangHongliang AnYan ZhangYinan XuHindawi LimitedarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENAdvances in Materials Science and Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Yiming Ma Xiaochun Lv Naiwen Fang Kai Xu Xingxing Wang Yicheng Yang Hongliang An Yan Zhang Yinan Xu Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel
description	In this paper, in situ observation of the cooling process of the deposited metal of low nickel high nitrogen austenitic stainless steel obtained by laser-arc hybrid surfacing welding with shielding gas containing only Ar and only N2, respectively, is carried out using the ultra-high-temperature confocal laser scanning microscope (CLSM). An in-depth analysis of the microstructural changes is conducted with SEM, EDS, and EBSD. The results showed that the surface substructure is refined during crystallization with shielding gas Ar. However, grains are seriously coarsened in the δ phase area. Widmanstatten γ and intragranular γ are formed as a result of δ ⟶ γ phase transition through the shear-diffusion mechanism. In the cooling process with shielding gas N2, the temperature range of each phase area narrowed obviously. Blocky γ began to appear because of the δ ⟶ γ phase transition through the diffusion mechanism. Generally, Ar and N2 have a strong effect only on the very shallow range from the surface. The area with a larger local misorientation with shielding gas Ar is at lath γ on the surface. With shielding gas N2, the large local misorientation area is the last contact position of γ during the δ ⟶ γ phase transition on the surface and cross section.
format	article
author	Yiming Ma Xiaochun Lv Naiwen Fang Kai Xu Xingxing Wang Yicheng Yang Hongliang An Yan Zhang Yinan Xu
author_facet	Yiming Ma Xiaochun Lv Naiwen Fang Kai Xu Xingxing Wang Yicheng Yang Hongliang An Yan Zhang Yinan Xu
author_sort	Yiming Ma
title	Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel
title_short	Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel
title_full	Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel
title_fullStr	Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel
title_full_unstemmed	Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel
title_sort	research on microstructure evolution of deposited metal of low nickel high nitrogen austenitic stainless steel
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/4344df20f3b94b7db63552525feab392
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Research on Microstructure Evolution of Deposited Metal of Low Nickel High Nitrogen Austenitic Stainless Steel

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