International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
CHEMICAL COMPOSITION % C SPECIFIED MAX 0.35 MIN ACTUAL
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Mn 0.60
Cr 1.00
Ni V 0.00 0.00
Mo P 0.00 --
S 0.020
Si 0.10
Al 0.020
0.40
0.90
1.20
0.25
0.050 0.035 0.035
0.35
0.060
--
0.361
0.74
1.07
--
-- 0.015 0.021
0.20
0.260
--
0.050 --
Other Remark --
Table 4:- Metallurgical Test Report[5] From the above report obtained from the metallurgical department of industry of 40Cr4, is found that the mechanical property of 40Cr4 is fulfill the requirement at a temperature of 8800c MECHANICAL PROPERTIES:TENSILE STRENGTH Kg/mm.sq
YIELD STRENGTH Skg/mm.sq
METALLURGICAL PROPERTIES:%E
INCLUSION RATING
%R
SPECIFIED
A
B
C
GRAIN SIZE (ASTM) SPECIFIED:- 5-
D
8 THIN/THICK
2.5/1 2/-
2/ -
2/-
1.5/0.5 1/-
-
1/-
OBSERVED:7.0
OBSERVED --
--
HEAT TREATMENT Hardened & tempered SPARK TEST DONE 100%
--
--
THIN/THICK
HARDNESS MICROSTRUCTURE SPECIFIED 235-277 BHN Tempered Martensite OBSERVED 241-269 BHN SPECTRAL TEST DONE 100%
ANY OTHER TEST -MAGNEFLUX DONE 100%
3. Conclusion The theoretical and experimental study points out the fact that it is necessary to study the influence of the hardening parameters on the mechanical properties of the 40Cr4 steel in order to meet the requirements. Along with that, hardness in the range 236-276 BHN is obtained at a temperature of hardening 880 0C. Analyzing the obtained mechanical properties the conclusions can be made: •
If the temperature of the hardening increases, the mechanical properties (i.e. the tensile, hardness and yield strength) increase.
•
If the cooling rate during hardening increases, hardness of 40Cr4 is also increases but along with that brittleness is also increases.
4. References 1) V.D. Kodgire and S.V. Kodgire, Material science and metallurgy, Everest publication house.vol.1,Jan 1991 pp191-192. 2) Gabriela Nicoleta Lazarescu, Niculae Napoleon Antonescu “Petroleum-Gas” University Ploiesti, Research Regarding The Heat-Treatment Influence On The Properties Of Ca-15 Martensitic Stainless Steel,pp1-2. 3) Nadum Ibrahim Nasir, The Effect of Heat Treatment on the Mechanical Properties of Stainless Steel Type 304,IJSER, pp1-2.
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