Strengthening of stainless steel weldment by high temperature precipitation

Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento; Édio Pereira Lima, Jr.; Fernanda Santos da Luz; Eduardo Sousa Lima; Fábio de Oliveira Braga

Journal of Materials Research and Technology (Oct 2017)

Strengthening of stainless steel weldment by high temperature precipitation

Sergio Neves Monteiro,
Lucio Fabio Cassiano Nascimento,
Édio Pereira Lima, Jr.,
Fernanda Santos da Luz,
Eduardo Sousa Lima,
Fábio de Oliveira Braga

Affiliations

Sergio Neves Monteiro: Corresponding author.; Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil
Lucio Fabio Cassiano Nascimento: Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil
Édio Pereira Lima, Jr.: Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil
Fernanda Santos da Luz: Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil
Eduardo Sousa Lima: Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil
Fábio de Oliveira Braga: Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil

Journal volume & issue: Vol. 6, no. 4
pp. 385 – 389

Abstract

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The mechanical behavior and the strengthening mechanism of stainless steel welded joints at 600 °C have been investigated. The welds were composed of AISI 304 stainless steel, as base metal, and niobium containing AISI 347 stainless steel, as weld metal. The investigation was conducted by means of creep tests. The welded specimens were subjected to both high temperature (600 °C) and long periods (up to 2000 h) under constant load, and both mechanical properties and microstructural changes in the material were monitored. It was found that the exposure of the material at 600 °C under load contributes to a strengthening effect on the weld. The phenomenon might be correlated with an accelerated process of second phase precipitation hardening. Keywords: Stainless steel, Weld, AISI 304, Precipitation hardening

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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