Abstracts Book - IMRC 2018

• SE2-P022
THERMOQUIMIC TREATMENT IN A STEEL AISI 1018 THROUGH
CHARCOAL AND GRAY IRON SHAVINGS.
Luis Eduardo Tovar Gallegos 1 , Jesús Salvador Luna 1 , Carlos Rodrigo Muñiz Valdez 1 , Marisol
Gallardo Heredia 1 , Juan Carlos Ortiz Cuellar 1 , Jesus Fernando Martinez Villafañe 1
1 Universidad Autónoma de Coahuila, Química, Mexico.
In the present work, was studied the behavior of the mechanical properties of
an steel AISI 1018. It was subjected to a thermochemical treatment of
cementation, by means of the individual use of charcoal and gray iron shavings
as cementanting element. The conditions applied for the thermic cycle of the
specimens treated with these two cementantings were: Temperature of 935°C
during 8 hours of permanence, followed by cooling in oil. Subsequent by a
process to release internal tension, that is to say, a distention, at 230°C of
temperature during 1 hour of permanence, and later a cooling to the
environment. For the development of thermochemical treatment, one box with
a lid, made of stainless steel was used. In which the steel and the cementanting
compounded for 80% charcoal and 20% barium carbonate (BaCO3) was
introduced. On the other hand, the steel and the cementanting compounded
for 80% gray iron shavings and 20% barium carbonate (BaCO3) was introduced.
After the treatment the characterization of the specimens was carried out,
starting with a chemical analysis (PMI-MAZTER spectrometer), hardness test
(TUKON 2500 Vickers durometer), tensile test (TINUS OLSEN machine) and
metallographic analysis. The result obtained for the cemented steel whit
charcoal were favorable, obtaining a cemented depth of 1610 microns with a
typical structure of martensite, and keeping the core with a perlitic structure.
For the case of the cemented steel with gray iron shavings, this presented a
changed of martensite structure on the whole sample, keeping 47 HRc of
hardness. It is concluded that is feasible the use of these two cementantings,
since its mechanical properties were absolutely enhanced. If this steel would
have been thermally treated in conventional way, these results would have not
been obtained.
Acknowledgment: CORPORACION MEXICANA DE INVESTIGACION EN
MATERIALES, S.A. DE C.V.
Keywords: Thermochemical treatment, Steel AISI 1018, Gray iron shavings
Presenting authors email: luis.tovar.gallegos@gmail.com