Page 66 - PCMI Journal July 2018

Issue 131
July 2018 PCMI Journal 65
Araz Ardehali Barani | Manager Development and Quality Precision Strip
Zapp Precision Metals GmbH | DE | The Effect of Metallurgical Features on the Etching Performance of Stainless Steels and Iron Nickel Alloys
PCMI 2018: The effect of metallurgical features on the etching performance of stainless steels and iron nickel alloys
The degree of deformation has an influence on etching rate Etching speed for a 430 strip prior and after cold-rolling
_ The extent of deformation affect the etching rate of AISI430 (1.4016)
)m
0,08
0,07
0,06
0,05
m(ht 0 , 0 4
pedhct 0 , 0 3 E
_Samples taken from 1 strip prior to and a3er cold rolling _Surface of samples ground and polished
_Etchant 40% FeCl3 solu?on _Etching temperature 40°C
1234567
0,02 0,01 0
May 14, 2018 | Technology PRECISION STRIP | Araz Barani | Page 10
Etching time (minutes)
430 work-hardened 430 annealed
PCMI 2018: The effect of metallurgical features on the etching performance of stainless steels and iron nickel alloys
Control of grain size and texture First conclusion
_ The grain size is relevant for the properties of material in the annealed condition. _ But annealed material is seldom used in photochemical machining industry. _ Depending on final forming to the desired strength level the crystal order is lost and
the question becomes how this affects the etching rate for various alloys? _ Further research is surely needed to clarify this question.
_ But for most applications this question is of lower importance as the thickness
tolerance is considerably larger than the variation due to grain orientation.
The most important factor is
to have a frozen process route for a certain product.
May 14, 2018 | Technology PRECISION STRIP | Araz Barani | Page 11
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