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Grain Size MeasurementAccording To ASTMStandards

Jabin Mathew Benjamin13MY04

Dept. of Metallurgical Engineering

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A!M "tan#ar# E11$%10

Determination of planar grain "i&e

A micro"copicall'%#etermine# grain "i&e of (o. 1ha" 1.000 grain")in$ at 100*

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+,A-( -EMEA/,EME(!

Comparison

 procedure

Planimetric

 procedure

Intercept

 procedure

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Comparison Procedure

ompari"on of the grain "tructure to a "erie" ofgra#e# image"

2all chart

lear pla"tic oerla'"

An e'epiece reticle./"e with a 10* objectie

!he following chart wa" u"e# to mae thi" image

ME!56D 76, DE!E,M-(-(+!5E A8E,A+E +,A-( -E

A!M ME!56D E 11$9( 1$%:01 1$0%10

9late 1B/ntwinne# +rain"

100*

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,epeatabilit' an# repro#ucibilit' of ;1 grain"i&e number.

pecimen" con"i"ting of e<uia=e# grain". ompari"on hart"

Plate I—Untwinned grains (flat etch).

Plate II—Twinned grains (flat etch)

Plate III—Twinned grains (contrast etch)

Plate IV—Austenite grains in steel 

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Planimetric or Jeffries Procedure

-nole" an actual count of the number of grain" within anown area.

(umber of grain" per unit area> !  A " is used to #etermine

the A!M grain "i&e number> #.

,epeatabilit' an# repro#ucibilit' of ;0.$: grain "i&e unit"

,e<uire maring off of the grain" a" the' are counte#.

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Relationship Between Magnification Used and Jeffries’

Multiplier, f, for an Area of 5000 mm2 (f= 0.0002 M 

2

 )

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Intercept Procedure Actual count of the number of

grain" intercepte# grain boun#ar'> per unit length of te"t line

?ineal intercept length> u"e# to #etermine the A!Mgrain "i&e number> #.

,epeatabilit' an# repro#ucibilit' are le"" than ; 0.:grain "i&e unit".

7a"ter than the planimetric metho# for the "ame leel ofpreci"ion.

tructure" con"i"ting of elongate# grain".

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e!n "ineal #ntercept $rocedure !he number of grain" intercepte# b' one or more

"traight line" "ufficientl' long to 'iel# at lea"t :0intercept".

Intercept 

Intersection

Circular Intercept Method  Automaticall' compen"ate for #eparture" frome<uia=e# grain "hape"

Ambiguou" inter"ection" at en#" of te"t line" areeliminate#

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A!M (o. 0 ha" a mean intercept"i&e of 3$.00 at 100*.

 lo @ 3$.00mm

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Reference

Abram"> 5.> +rain i&e Mea"urement b'the -ntercept Metho#> $etallograph% " Vol&" ''" pp. *+,.

 Metho#" for #etermining the aeragegrain "i&e A!M metho#" E 11$ 9( 1$%

:01 1$0%10

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