4D/4C/60K Tensile fail
4D/4C/60K Tensile fail
(OP)
Grade :4D/4C/60K
Tensile strength fail
Required value: 690 MPa min, but actual value: 664.62 MPa
Heat Treatment: Quecnch @ 930, 4 hrs soak & Tempered @ 660 Deg C 5 hrs soak.
What is the reason for tensile failure.
Tensile strength fail
Required value: 690 MPa min, but actual value: 664.62 MPa
Heat Treatment: Quecnch @ 930, 4 hrs soak & Tempered @ 660 Deg C 5 hrs soak.
What is the reason for tensile failure.





RE: 4D/4C/60K Tensile fail
RE: 4D/4C/60K Tensile fail
Only lab work will tell you which is at fault.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: 4D/4C/60K Tensile fail
Generally, you give more than what you get. Unfortunately in your case, you seem to be leaching the forums, by double posting and not contributing in any of the discussions taking place. Hope, you change soon enough.
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: 4D/4C/60K Tensile fail
Tensile strength fail
Not really a question, and I have no idea what those materials are.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: 4D/4C/60K Tensile fail
All my chemical elements are ok and heat treatment also ok. In single heat treatment cycle I have loaded 3 samples, composition is not much different. But 2 samples were failed and only 1 is pass.
Dont know Y ????
@arunmrao: I am just seeing everyone's post, all their answers are very generic and as a metallurgist I can also tell the same. But I want to know the real root cause or any person who faced this already and I need a solution from them.
We have only optical microscope, from that I cant identify the root cause because the pass and fail micro-structures are looks similar. What kind of analysis I have to do further (SEM + EDAX). Am also searching the facility for the same.
Last time I have posted all my problems in one post, someone said dont post all the problem in one thread, So I have posted it separately.
RE: 4D/4C/60K Tensile fail
If the Chemistry is OK and the heat treatment is OK why is it not strong enough.
What is the precise chemistry?
Have you done a hardness test as a basic check?
What can you learn from the fracture surface and nature of the tensile failure and what is the reduction in area/elongation.
You could have either grain growth issues or some intrinsic defect or more likely just a lack of control of some part of the process/testing.
RE: 4D/4C/60K Tensile fail
RE: 4D/4C/60K Tensile fail
Why have you selected the long soaking periods and temperatures? Thickness related? Chemistry related?
RE: 4D/4C/60K Tensile fail
All the above comments are reasonable and justified. Next time, if you participate in a discussion, provide complete details , like grade, actual chemistry, heat treatment cycle, actual mechanical properties, microstructure, ndt reports, profile of the casting.
This will give the experts ample guidance to share their opinions. Do not self certify, that they are as per spec and that you have a problem. It does not help any one.
WCB, WCC, WC16, ASTM 148 form the bulk alloys for a good steel foundry. If you are having trouble handling them, suggest you engage the services of an expert.
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: 4D/4C/60K Tensile fail
C 0.21 0.19 (0.23 Max)
Mn 0.88 0.83
Si 0.44 0.51
P 0.025 0.027
S 0.012 0.012
Cu 0.02 0.02
Ni 0.36 0.24
Cr 0.13 0.1
Mo 0.01 0.01
V 0.001 0.001
N 0.015 0.01
Al 0.097 0.05
Ti 0.041 0.029
Zr 0.003 0.002
Sn 0.003 0.003
Se 0.019 0.015
Pb 0.001 0.001
Sb 0.018 0.015
As 0.007 0.008
Cequ 0.41 0.368
Res 0.521 0.371
Required value: UTS: 690 MPa min, but actual value: 664.62 MPa
Heat Treatment: Quench @ 930, 4 hrs soak & Tempered @ 660 Deg C 5 hrs soak.
Soaking given based on the thickness of the casting. All the mechanicals tested in test bar only.
I have so many heats with the above chemistry is ok in mechanicals only few heats are getting failure.
RE: 4D/4C/60K Tensile fail
RE: 4D/4C/60K Tensile fail
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: 4D/4C/60K Tensile fail
Soaking hrs is based on the thickness of the casting (1 hr/ inch) For example 4inch thick casting given soaking for 4 hrs and 5 hrs in tempering.
RE: 4D/4C/60K Tensile fail
RE: 4D/4C/60K Tensile fail
Have you placed a thermocouple in the casting or a block of similar thickness. It is very important, for during tempering, furnace temperature need not be casting temperature.
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)