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Advisor(s)
Abstract(s)
Ductile cast irons have known significant developments, closely following the evolution
in mechanical strength recorded in other metal alloys. In fact, the chemical composition
and treatments that ductile cast irons can currently be subjected to, give them mechanical
strength far superior to the ductile cast irons that existed three decades ago, with rupture
stresses in the order of 500 MPa and even higher. These properties combined with the fact
that it is easy to manufacture parts with an almost final shape, makes these alloys highly
sought after in some types of industry, such as the automotive industry. Due to the high
content of carbon and other alloy elements with identical effects, welding is not a process
that is seen as viable for the manufacture of parts in this type of alloys. However, the same
is no longer the case in terms of repair, where welding can play a key role. Through a
comparative study, this work intends to show that there is no single way to improve the
mechanical properties in the welding of this type of alloys, and that each alloy should be
properly studied in order to obtain the best results. In this case, the heat treatments applied
to ductile cast iron with an ultimate tensile strength of 450 MPa and 700 MPa from the
same manufacturer are compared, making it clear that to achieve the best results in terms
of mechanical resistance, it is necessary to follow different routes, that is, choose to preheating
or post-heating treatments, depending on the microstructure of the alloy used. Thus,
the results obtained intend to show the mechanisms in which treatment is actually acting
on the alloy, promoting greater efficiency of the joint and having been achieved interesting
results at this level.
Description
Keywords
Ductile cast irons High-Strength ductile cast irons Welding Weldments heattreatment Preheat-treatment Postheat-treatment Ultimate tensile strength Elongation Microstructure Shielded metal arc welding Covered electrode Arc welding Inconel Ni alloys Filler metal
Citation
Publisher
Nova Science Publishers