Analytical-preshadowed extraction replica technique

Metallography ◽  
1972 ◽  
Vol 5 (5) ◽  
pp. 409-414 ◽  
Author(s):  
Robert J. Seher ◽  
Gunvant N. Maniar
Author(s):  
W. H. Smith

During aging of an iron based alloy, the degree of preparation has significant effects on the properties of the alloy. Long-term heat treatments can produce rather large precipitates. In order to obtain compositional and/or structural information from these large precipitates, it is often necessary to examine them in the absence of the surrounding matrix. However it has been found that the extraction replica technique is reliable only for particles 1 μn in size or less. Any larger particle tends to stay embedded in the matrix. We have found electrolytic extraction from the this bulk to be the only reliable way to obtain precipitate particles larger than 1 um. By modifying a gravimetric-vacuum filter assembly, a new method of extraction has been developed, eliminating the time consuming and laborious steps of centrifuging the electrolyte, retrieval of precipitates from test tubes, vacuum drying, and acid cleaning of glassware.


Metallography ◽  
1976 ◽  
Vol 9 (3) ◽  
pp. 245-255 ◽  
Author(s):  
K.M. Pickwick ◽  
R.H. Packwood

Metallography ◽  
1971 ◽  
Vol 4 (4) ◽  
pp. 365-369 ◽  
Author(s):  
R.H. Packwood ◽  
K.M. Pickwick

Author(s):  
Shin-hwa Park ◽  
Ki-hwan Kim ◽  
Byung-ryang An

Quantitative analysis of the precipitates of the steel is necessary in order to improve mechanical properties of the steel, because the precipitates in steels play an important role on the grain growth, recrystallization, and precipitation hardening. Recently, in-situ scanning electron microscope(SEM) observations on the precipitates with potentiostatic etching method in non-aqueous electrolyte have been reported. We applied the potentiostatic etching method for the preparation of the extraction replica.


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