Investigation Of Aging Heat Treatment On
Microstructure And Mechanical Properties Of
316L Austenitic Stainless Steel Weld Metal
Author(s)
A. Amari Allahyari, H. Farhangi & S. M. M. Hadavi
Abstract
Austenitic stainless steel alloys are used extensively in heat resistant structural
components in power generating and chemical industries. Austenitic stainless
steel weld metal exhibits a duplex microstructure consisting of a dispersion of
high temperature delta-ferrite in austenite. It has been shown that aging between
500–700°C results in progressive dissolution of the delta-ferrite and precipitation
of M23 C6 carbides and intermetallic phases.
In this paper, the effects of aging at temperatures between 550–850°C for
periods of up to 100 hours on the microstructure and mechanical properties of
316L austenitic stainless steel weld metal have been investigated. Austenitic
stainless steel 316L plates of 20 mm thickness were welded using the gas
tungsten arc welding technique. Tensile and impact test specimens were
machined from the weld sections and subjected to various aging heat treatments.
Based on the results of mechnical testing it was found that whereas the strength
properties show comparatively small variations due to aging, the tensile ductility
and impact toughness are strongly affected by increasing aging temperature and
time, such that aging at 850°C for 5 hour results in a 90% reduction in the value
of impact energy of the weld metal. The loss of impact toughness and tensile
ductility has been discussed based on the dissolution of delta-ferrite and
precipitation of the intermetallic sigma phase.
Keywords: aging, 316L weld metal, impact energy, ductility, delta-ferrite-sigma
phase.
Keywords
aging, 316L weld metal, impact energy, ductility, delta-ferrite-sigma
phase.
Related Book
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