Download PowerPoint **

Materials Science and Engineering A 466 (2007) 61–67
Effect of machining parameters on
surface textures in EDM of Fe-MnAl alloy
Y.H. Guu ∗, Max Ti-Kuang Hou
Department of Mechanical Engineering, National United University, 1, Lien Da,
Kung-Ching Li, Miaoli 360, Taiwan, ROC Received 29 November 2006; received
in revised form 6 February 2007; accepted 6 February 2007
指導老師：戴子堯 老師
姓名：黃中琳
班級：奈米四乙
學號：4A014056
Date ﹕2015/06/09
Outline
Introduction
Experimental procedures
Results and discussion
•
•
•
•
•
•
Surface morphology
Surface roughness
Micro-cracks and micro-voids
Machined damage
Compositions of the machined surface
Hardness of the machined surface
Conclusions
Introduction
The Fe-Mn-Al alloy is a structural material with
great potential mainly because of its superior
strength and toughness, high wear-corrosion
resistance and remarkable oxidation resistance at
high temperatures
 it is evident that no work has been performed on
surface textures with nanoscopic scale in terms of
using the EDM on Fe-Mn-Al alloy.
Experimental procedures
1008 plain carbon steel, electrolytic manganese,
and high-purity aluminum were melted and cast
into approximately 10 kg ingots.
After being homogenized at 1200 ◦C for 4 h under a
protective argon atmosphere→cut to the
dimensions of 100 mm × 50 mm × 10 mm→hotforging and cold-rolling into sheets of about 2 mm
in thickness
Fe-Mn-Al alloy was Fe (23.0 wt.%), Mn (7.4 wt.%),
Al (0.03 wt.%) and C→20mm × 20 mm × 2 mm
pulsed
generator
servo-control
The scanning size of each AFM
image was 40 μm ×specimen
40 μ m
Electrode
Dielectric
Fluid
oscilloscope
Results and discussion-Surface morphology
IP=0.5A
τon=3.2 μs
IP=0.5A
τon=6.4 μs
IP=1.5A
τon=6.4 μs
Results and discussion-Surface roughness
296nm
An excellent
machine
parameters at a
low pulsed
current and a
small pulse-on
duration
81nm
average error of 2.5%
Results and discussionmicro-cracks and micro-voids
865nm
530nm
average error of 2.1%
Results and discussionmicro-cracks and micro-voids
2038nm
average error of 4.5%
520nm
Results and discussion-Machined damage
IP=0.5A
τon=3.2 μs
IP=1.0A
τon=3.2 μs
2119nm
average error of 2.4%
IP↑&τon ↑
IP=1.0A
τon=6.4 μs
R a↓
IP=1.5A
τon=6.4 μs
777nm
be polished
Results and discussionCompositions of the machined surface
IP=0.5A
τon=3.2 μs
Non-EDM
IP=1.5A
τon=6.4 μs
Diffuse
Results and discussionHardness of the machined surface
Conclusions
 The higher discharge energy caused more frequent melting
expulsions, so Ra ↓
 The effect of the pulse-on duration was more dominant than the
pulsed current
 Electrode diffuse
 With microhardness value is non-uniform
Thanks for your attention