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Questions tagged [heat-treatment]

24 questions
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What is the physical reasoning behind metal becoming stronger and harder if heat treated?

I was wondering that if a proper process of heat treatment (heating to a temperature above upper critical temperature, then soaking and then quenching) is applied to a metal like steel, then what happens within the metal itself on microscopic level…
Rameez Ul Haq
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Can I weaken a coil spring consisting of spring steel?

I have a steel coil spring that is used by compression. It is too strong, and I would like to reduce its strength by some fraction, ideally keeping its length. Reducing it to roughly half would be nice. Uncontrolled heating and cooling in air would…
Volker Siegel
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Actual amount of reinforcement gained by adding gusset to welded steel tube construction

This question bothers me for quite a while and is about bicycle frame construction, specifically a BMX frame and even more specifically it's front triangle. It is a heavy duty frame by definition, and most common point of frame failure in this area,…
MumenRider
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Outline of Various Heat Treatment Processes

I've been trying to sort out some of the heat treatment terms for steel and what they actually mean since there seems to be a lot of interchangeable usage between the two. This is what I have so far. I am asking for any corrections if there is any…
DKNguyen
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Tempering 1095 steel

I have some laser-cut filing templates, about the size of a business card, made from 3mm-thick 1095 carbon steel. These parts will be used to guide a round metal file when filing odd shaped holes in aluminum. They will be clamped onto 13mm-thick…
BetterSense
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Why adding alloy elements in a steel for increasing tempering temperature while keeping the same hardnes and ductility?

What is the advantage of adding alloy elements in a steel in order to increase the tempering temperature while keeping hardness and ductility the same as before? If I wasn't clear enough, I want to know what difference makes a higher tempering…
Gabriel Lucas de Pinho
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Process changes in mechanical copper parts (stress relief)

Having some issues with assemblies, I try to explain my question with some introduction. Let's say, there's an assembly with two parts. Copper (OF / K30) and FR4. The copper part is milled from all sides extensively. In the process both parts are…
Ariser
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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 very welcome.
gateprep
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Safely evaporate electrolyte from fragile porous substrate

We have porous ceramic platelets of ~50x5x1 mm³ thickness infiltrated with ammonium nitrate solution (NH4NO3). We want to decompose and evaporate it w/o damaging the fragile substrate (decomposition should take place at ~210 °C) Since this is part…
ascripter
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Heating up Tool Steel with a welder

I'm a newbie of electricity and I would like to know if a piece of tool steel connected to both positive and ground pole of a welder tend to heat up red hot. If yes, at wich amperage? There are some risks involved such as overheating the welder or a…
Tommaso Lencioni
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Is hardened steel better than tough steel?

During the heat treatment process, people use clay to harden the steel in certain areas like the spine. Then they have to go through another process to make the steel tough. I need very hard steel and want to know will the hard steel be brittle and…
DeusIIXII
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Heat Fit Aluminum Sleve onto Shaft

IANAE I want to make an 1/8" steel rotary switch shaft into 1/4" so that it will accept the much more common 1/4" shaft knobs. If I use McMaster-Carr 92510A422: which is an aluminum unthreaded spacer that has an ID of 0.115", will heating it expand…
squarewav
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Aluminium brazing instructions: heat thoroughly to "open the pores" before tinning with rod

I have instructions for using aluminium brazing rod "HTS-2000". It says: Clean the area to be worked with a wire brush. Heat the work surface until it is hot enough to melt the rod. Open the pores of the work surface so the rod can penetrate the…
CL22
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Heat-shrinking vinyl

I want to make a vinyl stencil on a curved surface. I already use vinyl stencils with a vector cutter like Silhouette to make designs on flat surfaces. I also use heat-shrinking tape for insulating a repair of electric cables. So I suppose a…
miguelmorin
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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 takes place for manganese steel. I am basically…
gateprep
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