Page 64 - PCMI Journal July 2018
P. 64
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
5/29/18
PCMI 2018: The effect of metallurgical features on the etching performance of stainless steels and iron nickel alloys
Composition range for various stainless alloy families according to Schaeffler
Chromium-equivalent (%Cr + 1,5•%Si + 0,5•%Nb + 2,0•%Ti + 1,4•%Mo) May 14, 2018 | Technology PRECISION STRIP | Araz Barani | Page 6
austenite
A martensite +M
austenite +
martensite
ferrite + martensite
+F + ferrite
austenite + Ferrite
ferrite
martensite
PCMI 2018: The effect of metallurgical features on the etching performance of stainless steels and iron nickel alloys
Metallic materials used today by PCMI are polycrystals
_ Metallic materials used typically in most industrial applications are not single crystals
_ They are composed of grains, i.e. small crystals with different orientation in space
_ Each crystal plane behaves differently in etching due to the directionality of bonding energy and the number of atoms that have to be removed by the proceeding electrochemical reactions.
May 14, 2018 | Technology PRECISION STRIP | Araz Barani | Page 7
IPF | | TD {hkl}
transverse direction
iron-nickel alloy (UNS K93603 / Ni36) annealed condition
Issue 131
July 2018 PCMI Journal 63
20%
40%
80%
100%
normal direction
Nickel-equivalent
(%Ni + 0,5•%Mn + 30•(%C + %N)
3
