<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Three kinds of electrode with different niobium contents were developed and compared, and the influence of alloying elements on microstructure and mechanical properties was summarized. Strong carbide elements such as Nb, Ti, and V were added to form stable precipitates. The existence of intercrystalline precipitates leads to pinning and zigzag of grain boundaries, hinders the propagation of cracks, and enhances the low temperature strength and impact toughness of the materials. The No. 1 and No. 2 ENiCrMo-6 electrodes meet the requirements of LNG (liquified natural gas) equipment. The tensile strength of the deposited metal reaches 687 MPa, while the average impact energy at −196°C is 131 J. Owing to fluctuations in the stress concentration at the junction of grain boundaries, cracks may easily form. MC carbide can retard the crack propagation. With the increase of Nb and other alloys, the strength and hardness increase gradually, but the plasticity and toughness are retarded to a certain extent.</p>
</abstract>

Three kinds of electrode with different niobium contents were developed and compared, and the influence of alloying elements on microstructure and mechanical properties was summarized. Strong carbide elements such as Nb, Ti, and V were added to form stable precipitates. The existence of intercrystalline precipitates leads to pinning and zigzag of grain boundaries, hinders the propagation of cracks, and enhances the low temperature strength and impact toughness of the materials. The No. 1 and No. 2 ENiCrMo-6 electrodes meet the requirements of LNG (liquified natural gas) equipment. The tensile strength of the deposited metal reaches 687 MPa, while the average impact energy at −196°C is 131 J. Owing to fluctuations in the stress concentration at the junction of grain boundaries, cracks may easily form. MC carbide can retard the crack propagation. With the increase of Nb and other alloys, the strength and hardness increase gradually, but the plasticity and toughness are retarded to a certain extent.

Weld defects and precipitates of deposited metal in 9Ni steel welded joint

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Weld defects and precipitates of deposited metal in 9Ni steel welded joint"}

Three kinds of electrode with different niobium contents were developed and compared, and the influence of alloying elements on microstructure and mechanical...

Weld defects and precipitates of deposited metal in 9Ni steel welded joint

Pubblicato online: 27 mag 2022

Pagine: 25 - 48

Ricevuto: 16 ago 2021

Accettato: 19 dic 2021

DOI: https://doi.org/10.2478/msp-2022-0007

Parole chiave
deposited metal, 9Ni steel, welded joint, precipitate

© 2021 Chengyong Ma et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Weld defects and precipitates of deposited metal in 9Ni steel welded joint

Pubblicato online: 27 mag 2022

Pagine: 25 - 48

Ricevuto: 16 ago 2021

Accettato: 19 dic 2021

DOI: https://doi.org/10.2478/msp-2022-0007

Parole chiavedeposited metal, 9Ni steel, welded joint, precipitate

© 2021 Chengyong Ma et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Parole chiave
deposited metal, 9Ni steel, welded joint, precipitate