Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:385-9 DOI: 10.1016/j.jmrt.2017.09.001
Original Article
Strengthening of stainless steel weldment by high temperature precipitation
Sergio Neves Monteiro, , Lucio Fabio Cassiano Nascimento, Édio Pereira Lima, Fernanda Santos da Luz, Eduardo Sousa Lima, Fábio de Oliveira Braga
Military Institute of Engineering (IME), Materials Science Department, Rio de Janeiro, RJ, Brazil
Received 31 May 2017, Accepted 05 September 2017
Abstract

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 2000h) 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
J Mater Res Technol 2017;6:385-9 DOI: 10.1016/j.jmrt.2017.09.001