IS 12279: Method for determination of transverse rupture strengh of sintered metal materials (excluding hardmetals)

2005·1 MB·English

by  Bureau of Indian Standards

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IS 12279 (2005): Method for determination of transverse
rupture strengh of sintered metal materials (excluding
hardmetals) [MTD 25: Powder Metallurgical Materials and
Products]
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Satyanarayan Gangaram Pitroda
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IS 12279:2005
ISO 3325:1996
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Indian Standard
SINTERED METAL MATERIALS, EXCLUDING
HARDMETALS — DETERMINATION OF
TRANSVERSE RUPTURE STRENGTH
( First Revision)
ICS 77.160

@ BIS 2005
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
~~y 2005 Price Group 2 ‘
Powder Metallurgical Materials and Products Sectional Committee, MTD 25
NATIONAL FOREWORD
This Indian Standard ( First Revision) which isidentical with ISO 3325:1996 ‘Sintered metal materials,
excluding hardmetals — Determination of transverse rupture strength’ ( along with Amendment No.1 )
issued by the International Organization for Standardization ( ISO ) was adopted by the Bureau of
Indian Standards on the recommendations of the Powder Metallurgical Materials and Products
Sectional Committee and approval ofthe Metallurgical Engineering Division Council.
IS 12279 was first published in 1988 based on ISO 3325:1975. Since ISO 3325 has been revised
in 1996 and Amendment No. 1was issued to IS 3325:1996 in2001, therefore, need was felt to revise
IS 12279 also.
The text of the ISO Standard has been approved as suitable for publication as an Indian Standard
without deviations. Certain terminology and conventions are, however, not identical to those used in
Indian Standards. Attention is especially drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be
read as ‘Indian Standard’.
b) Comma ( ,) has been used as a decimal marker while in Indian Standards, the current practice
is to use a point ( .) as the decimal marker.
In reporting the results of a test or analysis made in accordance with this standard, ifthe final value,
observed or calculated is to be rounded off, itshall be done inaccordance with IS 2 :1960 ‘Rules for
rounding off numerical values ( revised)’.
“1
IS 12279:2005
ISO 3325:1996
/ndian Standard
SINTERED METAL MATERIALS, EXCLUDING
HARDMETALS — DETERMINATION OF
TRANSVERSE RUPTURE STRENGTH
( First Revision)
1 Scope 3 Appamtus
This International Standard specifies a method for the 3.1 Test equipment, of any type providingstatic
determination of the transverse rupture strength of loadingconditionsandanaccuracyofkl Y..
sintered metal materials, excluding hardmetals. The -1
method is particularly suitable for comparing the sin- The equipment shall have two ~support cylinders
tered strength of abatch of metal powder with that of (rollers)with a fixed distance between them and a
areference powder or with areference strength. load-application cylinder (roller). All three cylinders
shall be 3,2 mm &0,1 mm in diameter and shall be
The method is applicable to sintered metal materials, made either of hardened steel with a hardness of at
excluding hardmetals, whether they have been sub- least 700 HV or of hardmetal.
jected to heat treatment after sintering or not, and
The support cylinders shall be mounted parallel to
also to materials that have been sized or coined after
each other, and the distance between their centre-
sintering.
lines shall be either 25,0 mm * 0,2 mm or
25,4 mm+ 0,2 mm, measured with an accuracy of
It is specially suitable for materials having a uniform
A 0,1 mm for the calculation. The load-application
hardness throughout their section and negligible duc-
cylinder shall be mounted midway between the sup-
tility, i.e. a ductility corresponding to a permanent
port cylinders.
deformation of less than about 0,5 mm measured
between the two supports during the transverse rup- For better accuracy,the mounting of the cylinders

ture strength determination. If the test is applied to shouldpreferablybe such as to compensate for any
materials under conditions other than those specified deviation from parallelism between the top and bot-
above, the conditions shall be reported. tom faces of the test piece. This can be accomplished
by mounting the support cylinders so that each can be
NOTE1 The permanent deformation can be measured adjusted vertically (see figure 1).
with sufficient precision from the two fragments of the
broken or cracked barby indexing the lower surface. Alter- A diagrammatic arrangement of a typical test rig is
natively, the deflection of a straiaht line drawn horizontally shown in figure 1.
on the’side of the test piece c;n be measured using an
optical instrument such as a measuring microscope or The fixture should prefwably be surrounded by a suit-
optical comparator. able safety guard.
,
4 Test piece
4.1 The test piece shall be nominally 6 mm thick and
2 Principle produced from a die cavity of nominal dimensions
30 mm x 12 mm. The test piece thickness shall be
A test piece resting on two supports is broken by the uniform to within 0,1 mm over the whole length and
application of a load at the midpoint between the sup- to within 0,04 mm across any width line perpendicular
ports, under short-term static loading conditions. to the height and length.
IS 12279:2005
ISO 3325: 1996
4.2 Alternatively,machinedtestpiecesmaybeused, b is the width, in millimetres, of the test piece
inwhich case care shallbe taken duringmachining at right angles to its height;
to ensure that no stress raisersare introducedinto
the test piece. The test piece shallbe cut with the h isthe height (thickness), in millimetres, of the
30 mm x 12 mm faces perpendicular to the compac- test piece parallel to the direction of applica-
tion axis, on account of possible anisotropy, choosing tion of the test load.
a region of uniform density. Furthermore, the machin-
ing technique employed to obtain the test piece shall Report the arithmetical mean of the transverse rup-
not cause significant structural changes, such as den- ture strength determinations, rounded to the nearest
sification when shearing a soft material or microstruc- 10 N/mm*.
tural changes produced by electro-erosion machining
techniques. If such changes do occur, grinding to
6.2 The absolute uncertainty of this method is given
remove the disturbed material is recommended.
by the equation
5 Procedure
5.1 Measure the width and thickness of the test
or
piece at its midpoint to the nearest 0,01 mm.
(1 0,1 0,01+ 2x 0,01
5.2 Place the test piece on one of its 30 mm AR=R —
x 12 mm faces symmetrically on the support cylinders loo+%+-i2- 6, )
so that its longitudinal axis is at 90° * 30’ to the longi-
tudinal axes of the cylinders. Precise positioning of the or
test piece can be easily ensured by pushing the side
AR= 0,02R
of the test piece up against a suitably located, remov-
able stop. Apply a load at a position midway between
This valueshallbetaken intoaccountifanyprecision
the two cylinders. Increase the load slowly and stead-
statementismade.
ily, so that the time to fracture is not less than 10s.
Record the value at which the load suddenly drops
due to formation of the first crack.
7 Test report
5.3 Repeatthedeterminationwithasuitablenumber
of test pieces. The test report shall include the following information:
a) areference to this International Standard;
6 Expression of results b) all details necessary for identification of the test

sample;

6.1 The transverse rupture strength Rtr, in newtons
per square millimetre, is given by the equation
c) the distance between the centres of the SUppOrt
cylinders;
3FL
Rtr=—
2bh2 d) the result obtained;
where
e) details of anyoperation not specified by this in-
ternational Standard, as well as any operation re-
F isthe load, in newtons, required for fracture; garded asoptio~l;
L is the distance, in millimetres, between the f) details of any incident which may have affected
supports; the result.
IS 12279:2005
ISO 3325:1996
Dimensionsinmillimetres
I
-t-
I i
I I 1
i! ~
i! 1
-ri
+i
1
c
i
—
I
I
. .
1=25i0,2

or’
L=25,44,2
Figure 1—Test equipment fordetermination oftransverse rupture strength
3
IS 12279:2005
ISO 3325:1996
AMENDMENT
1
Page 2,clause 6
Add the following subclause concerning a precision statement
6.3 The values given in Table 1 were calculatedfor repeatabilitylimit(r) and reproducibilitylimit(R). These
valuesstatethatitistobeexpectedthatwhentestingsamplesfromanygivenlot,a Iaboretotywillrepeatitsown
measurementswithintheappropriatevalueof(r)95YO ofthetimeandthata laboratorywillduplioetetheresultsof
anyothergivenlaboratorywithinthelargervalueof(R),95YO of the time.
Table 1— Precision data
Material a & r R
N/mm2 Nlmmz N/mm2
Iron, 490 38 97
0,5 Y. combinedcarbon I I I
Iron, 2 ‘XOCu, 990 86 145
0,8 ?4.combinedcarbon
Pre-alloyed 4600, 2 % Cu, 1200 199 286
0,8Y. combinedcarbon
Iron,2Y. Ni, I 1320 I 163 I 279
0,5%combinedcarbon I I I
Heat treated
a Additional information on the materials can be taken from MPIF (Metal powder Industries F~eration, USA)
Standard 41:1998, Determination of TransverseRupture StrengthofPonder Metallwgy Materials.
4
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This Indian Standard has been developed from DOC : No. MTD 25 ( 4413 ).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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