Questions tagged [heat-treatment]

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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. ...
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12 votes
4 answers
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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 ...
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1 answer
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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 ...
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1 vote
0 answers
29 views

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 ...
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1 vote
1 answer
180 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 ...
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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 ...
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2 votes
1 answer
100 views

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 ...
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-1 votes
1 answer
42 views

Heating tape that has leads like picture below

Does anyone know where I can find Heating tape that has these same leads or know what they are called? It is meant to be plugged into the second picture attatched.
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8 votes
8 answers
6k views

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 ...
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0 votes
1 answer
66 views

Ductility of Fe-Ni Alloy

Cold worked Fe-Ni rod is very brittle and not suitable for drawing. What would be the best heat treatment parameters for increasing the ductility of a Fe-Ni Alloy? Does increase in the Co content make ...
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0 votes
1 answer
377 views

Heat press of vinyl on 100% polyester fabric

I want to customise a piece of fabric that is 100% polyester (exclusive of decorations, wash at 30º) with vinyl. My idea is to use a vinyl cutter (such as Silver Bullet) to cut a pattern on the sheet, ...
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0 votes
4 answers
65 views

small relatively inexpensive crack detection apparatus for bike shops

Is there a relatively inexpensive (let's say under $500US) crack-detection device and related mobile app that would be easy enough for a non-engineer/non-metallurgist to use to determine whether a ...
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0 votes
2 answers
247 views

Can I keep hardened steel cool with ice while welding?

I would like to weld a piece of hardened steel but i don't want to ruin the treatment on the tip of the piece. Can i put some ice in the middle of the shaft so the heat generated from the welding (...
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1 vote
0 answers
22 views

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 ...
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1 vote
3 answers
189 views

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 ...
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0 votes
2 answers
117 views

Room with computer racks, with or without ventilation

I have a room of computer rack that with 2750 watt power needs, which according to this site, I need 9000 BTU/h AC. I'm deciding if I should put a vent in the room or not. When there's a ventilation, ...
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3 votes
1 answer
2k views

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 ...
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0 votes
1 answer
54 views

What considerations should I take when flame-hardening a wheel?

I'm currently trying to figure out whether or not we can flame-harden a steel wheel which was supplied with a lower hardness than expected. I'm worried, however, that flame-hardening can either deform ...
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0 votes
1 answer
142 views

Maximum Carbon content on the surface of Mild Steel that is Pack Carburized

Starting from a piece of Mild Steel that is then Pack Carburized, what's the maximum Carbon content that the surface can soak in? Given that we keep it around less than 1000°C and enough time, is it ...
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2 votes
1 answer
36 views

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 ...
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1 vote
2 answers
1k views

Is hardened steel better than tough steel? [closed]

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 ...
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If I use clay tempering, can I take a thin piece of steel and make it hard as a very thick piece? [closed]

If I use the forging process of clay tempering, can I take a thinner piece of steel and and make it as strong as a very thick piece of steel? Getting the same strength, without the extra weight?
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1 vote
2 answers
586 views

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 ...
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0 votes
1 answer
369 views

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 ...
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