Investigation of Hardox 400 Steel Exposed to Heat Treatment Processes in WEDM

Year 2019, Volume: 22 Issue: 1, 237 - 244, 01.03.2019

Mehmet Altuğ

https://doi.org/10.2339/politeknik.417764

Cited By: 1

Abstract

In
this study, microstructure, mechanical, and conductivity characteristics of
Hardox 400 steel were changed with different heat treatments and effect of such
characteristics on its machinability with Wire Electrical Discharge Machining
(WEDM). Optical microscope examinations were performed to determine various characteristics,
and additionally microhardness and conductivity measurements were conducted
hereof. L18 Taquchi test design was conducted with three levels and four
different parameters to determine the effect of such alterations on its
machinability with WEDM and post-processing Cutting width (kerf), Surface
roughness (Ra), Material removal rate (MRR) values were determined. Micro
changes were ensured successfully by using applied heat treatments. The best kerf value was obtained from sample 6 which
was tempered from 350 °C. The
microstructure of this sample was composed of 
commonly α ferrite and few pearlites. The best Ra value was obtained
from sample 3 which was tempered from 200 °C. The microstructure of this sample was composed of few α ferrite and commonly
pearlites. The best MRR value was obtained from sample 5 which was tempered
from 300 °C. The microstructure of this
sample was composed of  almost equally α
ferrite and pearlites. Additionally the most effective parameters on Ra were
determined as hardox and current. The most effective parameters on kerf and MRR
were determined as time off and hardox.  

Keywords

Hardox steel, heat treatment, microstructure, WEDM, kerf, Ra, MRR

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