All Questions
21
questions
2
votes
0
answers
28
views
What determines the rate of electron discharge machining (EDM) for different materials?
Wire EDM makes no contact with the work piece and disregards hardness.
I am using EDM to cut different materials, and I notice a clear distinction between the rate each material gets cut. For example, ...
- 131
2
votes
2
answers
101
views
Best way to prepare a rusty metal surface for hardness testing?
I have a hardox #10mm plate that needs to be tested on Rockwell hardness.
As hardox is sensible to heat I would like to avoid any heat treatment before the testing.
The plate has been water cut.
The ...
- 137
0
votes
0
answers
89
views
Why is carbon boil even necessary?
Particularly in an Electric Arc Furnace I have seen carbon boil occuring . I understand the reaction is very vital but what is it's utility? A detailed answer to this is most welcome. The internet ...
- 243
1
vote
1
answer
46
views
What does time temperature specifically give us? [closed]
What is a Time Temperature curve basically? I have come across this a couple of times while dealing with heat treatment in my industry. A detailed reply to this is most welcome.
- 243
0
votes
1
answer
98
views
Why is manganese steel non magnetic in as cast condition? [closed]
Is it because of some ferrite stabilizer or something?A detailed explanation to this is most welcome.
- 243
1
vote
1
answer
886
views
Why does decrease in dislocation density result in higher ductility?
Why does a decrease in dislocation density result in decrease in yield strength and increase in ductility?A slightly detailed explanation is what I am looking forward to.
- 243
1
vote
1
answer
1k
views
What is meant by soaking time in heat treatment?
After heating at 950°C and holding the temperature for 3 hours there is a soaking time that is provided for 12 hours. What is the soaking time being referred to here? A detailed reply to this will be ...
- 123
0
votes
0
answers
36
views
A question on how heat treatment is done in bogies
During heat treatment of metals I find that Normalizing is done in railway bogies and tempering is done following normalizing only for the CP top and bottom. Following the tempering process quenching ...
- 123
1
vote
2
answers
80
views
Question about a particular statement on plastic deformation of single crystals
"...the wider the dislocation, the lower is the elastic energy of the crystal because the atomic spacing in the slip direction is closer to its equilibrium spacing."
What has elastic energy ...
- 281
2
votes
1
answer
52
views
Can a threaded fastener stretch so much it can be miss-read as a different pitch?
Can a threaded stud of mild steel, size 5/8"-11 over a threaded portion of 1.25" stretch so much over time that it reads 5/8"-13?
Unthreaded portion of the stud reads .625-630" in ...
- 404
5
votes
2
answers
93
views
Non-toxic material for deformable wire/rod without work hardening
I am looking for a non-toxic material for a wire/rod that allows room temperature deformations without work hardening.
Example uses are semi-rigid cables that one can bend and that hold their shape ...
0
votes
2
answers
53
views
Precipitation Hardening
Please explain the meaning of this statement with close reference to Precipitation hardening,"The relative rates of nucleation and growth are controlled by temperature. The size and dispersion of the ...
- 281
1
vote
3
answers
82
views
(moulded) cast properties of the untreated surface
While my research about the untreated surface of moulded cast I read that the properties such as tensile strength, 0,2% proof stress and so on are different (much smaller) from the properties you can ...
- 218
0
votes
0
answers
31
views
How to find phase proportion at equilibrium - from iron-carbon diagram - Leblond
{Equilibrium proportion P, this is the proportion which is reached at a constant temperature after an infinitely long time:P is also the austenite proportion in the case of extremely slow heating. It ...
7
votes
2
answers
241
views
Can high alloy tool steels be quenched in brine?
It is will known that most of tool steels are quenched in oil to prevent cracking and distortion which appears when quenching in water due to non-uniform cooling caused by formation of insulating ...
- 81