All Questions
7
questions
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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
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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
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6
answers
3k
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How to create an airtight connection between Stainless Steel and PTFE?
I have these two parts shown below, the bottom cylindrical part is stainless steel, the rectangular upper piece is PTFE (Teflon). The SS prongs from the lower part need to insert into the holes of the ...
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1
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What is strain hardening exponent?
Hardening leads to a material being more brittle.However I can't understand what is strain hardening or strain hardening exponent.Please explain why hardening leads to brittleness also in this answer ...
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-1
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3
answers
1k
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Why are car bodies not made of titanium?
Titanium is more durable and stronger than steel. I checked the price of titanium and it is not too high. Despite that, I could find only one car made of titanium costing, and it cost 2 million.
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- 155
1
vote
1
answer
150
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No increase in temperature during bending?
Good day, I am a mechanical engineering student, we conducted three-point bending test for a metal specimen and I am wondering why the temperature of the specimen did not increase as the UTM certainly ...
0
votes
1
answer
2k
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Chamber Wall Thickness for Liquid Fuel Rocket
In, How to Design, Build, and Test Small Liquid-Fuel Rocket Engines, by Krzycki, page 18 has the following equation:
$$t_w = \dfrac{PD}{16000}$$
Assuming the following:
Pressure ($P$) in combustion ...
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