Effect of Nb on the microstructural evolution and microhardness of Super304H austenitic stainless steel weld metals during long-term aging-Reference-Cited by-同舟云学术

Effect of Nb on the microstructural evolution and microhardness of Super304H austenitic stainless steel weld metals during long-term aging

Published:2022-01-01 Issue:1 Volume:113 Page:33-43
ISSN:1862-5282
Container-title:International Journal of Materials Research
language:en
Short-container-title:

Author:

Xiao Xiaopeng¹²,Li Dianzhong²,Li Yiyi²³,Lu Shanping²

Affiliation:

1. School of Materials Science and Engineering, University of Science and Technology of China , Shenyang , P. R. China

2. Shenyang National Laboratory for Materials Science , Institute of Metal Research, Chinese Academy of Sciences , Shenyang , P. R. China

3. Key Laboratory of Nuclear Materials and Safety Assessment , Insititute of Metal Research, Chinese Academy of Sciences , Shenyang , P. R. China

Abstract

Abstract The microstructural evolution and mechanical properties of Super304H austenitic stainless steel weld metals with Nb-free and 1.0 % Nb-additive were investigated during 650 °C long-term aging. Massive nanoscale M 23C6 particles distributed in the interdendritic regions of the Nb-free weld metal while most of the M 23C6 formed and coarsened on the phase interface between the primary Nb(C, N) phase and matrix in the Nb-bearing weld metal. Nano-sized Cu-rich particles dispersed inside the grains in both weld metals. All of these nano-sized particles gradually coarsened over time. The Cu-rich particles with high distribution density and nanometer size affect the microhardness of both weld metals most during long-term aging. The addition of Nb could increase the microhardness in the relatively short aging time, while the effect of Nb-addition on the microhardness in long-term aging is insignificant.

Funder

Shenyang National Laboratory for Materials Science

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

Link

https://www.degruyter.com/document/doi/10.1515/ijmr-2021-8263/pdf

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