Experimental Study of the Effect of Siliconizing Parameters of Thermochemical Treatment of low Carbon Steel
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In order to use minimum time and save energy
during siliconizing surface hardening of low carbon steel it
is important to study the siliconizing parameters to obtain
optimum conditions. In this work, the experimental design
using the Taguchi method is employed to optimize the siliconizing
parameters in the pack siliconizing surface hardening
process. The siliconizing parameters evaluated are:
siliconizing temperature, siliconizing time, silicon potential
(ratio of silicon powder to bean pod ash (BPA) nanoparticle)
and tempering temperature. The results showed that
case depth and hardness values increased exponentially by
increasing siliconizing temperature and time. Optimum values
of hardness were obtained at a siliconizing temperature
of 1000 ◦C, siliconizing time of 5 hours, silicon potential
of 75 wt.% silicon/25 wt.% BPA and tempering temperature
of 200 ◦C.With percentage contribution of: siliconizing
temperature (79.86 %), siliconizing time (12.54 %), silicon
potential (5.34 %) and tempering temperature (2.26 %).Silicon powder and bean pod ash nanoparticles can be effective
for use as siliconizing materials in the ratio of 75 wt.%
silicon/25 wt.% BPA. The activation energy (Q) for research
work was determined as 333.89 kJ.mol−1. The growth rate
constant (K) ranged from 6.78×10−8 to 2.05×10−6 m2.s−1.
The case depth, hardness values and wear rate of siliconized
mild steel at these operating conditions can be used for technological
and industrial applications such as gears and cams.
Keywords
T Technology (General), TJ Mechanical engineering and machinery