Abstract
The electrical discharge machining process is an effective way to machine hard alloys. A homogenized dual phase Fe-24.0%Mn-8.3%Al-5.0%Cr-0.38%Si-0.34%Mo-0.45%C (wt%) alloy casting piece was employed to study the phase transformation and microstructure phenomena of recast layers by means of electrical discharge machining. The wave-like recast layers appear with micro cracks. The thickness of the recast layer increases with pulse duration. When the pulse duration ranges from 200 to 300 μs, the discharge current has no influence on the thickness of the recast layer. The copper concentration is high in the recast layer caused by the melting of the copper electrode. The copper contents of the recast layer increase with the pulse duration and the discharge current.
Published Version
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