International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
2.2 Effect of Hardening and Tempering temperature on hardness of 40Cr4
Hardening
Temperin g
460 450 H A R
280
440
275
430
270
D
420
N E S S
265
410
260
400
255
390 890
900
910
Hardening Temperature
250 570
580
590
Tempering Temperature
Fig 1:- Graph of Hardness Vs. Tempering Temperature and hardening Temperature[5] From the graph, we can conclude that1.
Increase in the hardening temperature, hardness of 40Cr4 increases but at the same time brittleness also tends to increases.
2.
Increase in the tempering temperature, hardness of 40Cr4 is also decreases and at the same time ductility is increases in small amount.
Fig 2:- TTT Diagam for Hardening and Tempering [1]
Š 2017, IRJET
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