Why Steel Turns Blue!
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- čas přidán 28. 07. 2019
- I think we all know steel changes colour when you heat it, but do you know why? This video is to answer that question of what thin-film interference is!
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#science #steel #colour
This is something I’ve wanted to know but never thought of asking. Thanks for the insight!
Great video satisfied my curiosity from the last video and was a good visual explanation as well as some other cool stuff I didn't know
Thanks Mr Spicy - physics and chemistry all in one. Grateful for the detailed yet straightforward explanation. Now we know... Keep up the good work 👍
Absolutely fascinating. I've really learned here and yet again the way you present explanationz is top class. I just get you bruv😂😉😊
I found that absolutely fascinating, particularly the samurai sword bit. I presume that they have to heat and quench many times to get the required curve in the sword, along with beating and folding to achieve a superior product.
Check the video out. czcams.com/video/viqrOAG13Q0/video.html
@@spicy110 Excellent! Wonderful to watch, and to think that the technology is thousands of years old.
Enjoyed learning loved finding out about swords something so soothing about watching metal heat up
Thank you so much! This really helped with a school project.
Hi spice110 I so happy you did this video it was very interesting and useful to know thank you 🏆
Great vid. Depending on the tags, this could go viral. It certainly should!
Thanks I wish that were the case but as you can see from the view count this isn't being pushed to many people.
spicy110 search video views take time Spicy. Ones like this is a good investment
Very informative, thanks for making this video
Yeah I remember watching a lot of blacksmithing videos for some reason, there's a lot of skill involved. Some guy was making armour and heated it up to straw yellow quenched it for a certain amount of time then annealed it a bit in ash to make it more like spring steel beause you don't want very hard or very soft for armour, you want it to be somewhat flexible though
Excellent explanation!
Good video and the rainbow effect is known as the HAZ (Heat affected zone) it can be done by various processes such as welding, burning and using CNC plasma operation’s. The haz also indicates the materials recrystallising it’s grain structure in the steel. Mild steel which is a ferrous material is the easiest material to get the rainbow effect due to its high melting point of 1450-1500 degrees Celsius
Thanks very nice explanation!
Great video! I was really hoping you would go in to more detail. Im trying to find more, in depth, information of this subject.
I'm sure the info is out there sadly I only know the basics 🙂
Thanks for the video, it is very informative. One question, if so the material is painted on the sides and the heat flowing through it from one end to other end.. does the steel on the painted sides still changes colour underneath the paint? Thinking the heat resistant paint will not allow the oxidation to happen and no colouring of material due to heat will occur right .. please correct me if I am wrong.
I'm wanting to "stain" a stainless steel prep table by heating it. I know you say this is only molecules thick. Will the staining be able to be scratched off? And how do you keep the heat the perfect temp for the perfect color
the metal strip in a vise is a beautiful demo !
I stumbled on this bwcause i was thinking I wanted to turn my exhaust tips blue. Now I know I need a torch to heat it up 😅. Thank you
I bought a blitz nur spec r stainless steel exhaust which is 304 grade stainless steel. I can’t get it to turn blue only purple but it gets blotchy. Any ideas? The metal was turning red it was that hot when being heated
What might have helped me even more is some greater association between visible color and utility - I can easily get metal to blues and purples with a small torch, but I don't know what practical advantage might derive from that.
There is no benefit, other than knowing what temperature the metal has got to for hardening. As the video explains, it is a VERY thin layer that can be scratched off easily.
"Flame on"
- the human torch
Fascinating subject which made me wish I had taken more notice in A level physics and that Wiki had been around!
Interestingly, steel in a tempering oven, held at 205 °C (401 °F) for a long time, will begin to turn brown, purple or blue, even though the temperature did not exceed that needed to produce a light-straw colour.
And changing the subject slightly, as you move through the Curie temperature (around 770C for carbon steel) you misalign the magnetic domains of say your steel rod (had it been magnetised) and if it had started off magnetic, it now loses that property until it is cooled down to around 260C. Not incidentally to be confused with the Néel temperature which is the temperature above which an antiferromagnetic material becomes paramagnetic-that is, the thermal energy becomes large enough to destroy the microscopic magnetic ordering within the material.
I always thought that magnetism was akin to magic and I still do...
Great explanation. Are we having a name the rat competition?
If you're interested in blades/forging there's a tv show that I watch called Forged in Fire would recommend. And it's informative
Will it do the same with carbon steel?
Can you give the link to that samurai sword video you was talking about please spicy if you have enough time?
I am really interested lol
czcams.com/video/viqrOAG13Q0/video.html
Just watched it and I never thought they made them like that tbh that is some truly interesting stuff. Thank you spicy your a legend
good sir keep it on
Would the discoloration permanant even if you rub it moderately? Is there any other way to make the colors never disappeared with example something to cover it like glue?
It's very very thin so it will scratch easy, you can clear coat it but it defo dulls the colours.
@@spicy110 thanks.
Professor Spicy explains it all. 🍻
I have a couple of questions about this,
Is this what "blue brittleness" is?
You say that the colours of the metal are from the temperature that it is at, but the piece that you show keep the colour.
So my second question is that, could that oxidized layer affect an impact test result for a steel that is tested at an elevated temperature?
You mentioned that the steel changes crystal structure, and becomes harder and more brittle because of it, but does the "blue brittleness" also affect it in some way as well?
Thank you in advance.
Just FYI, the "markings" on the sword blade is created by what's known as "differential hardening". In traditional Japanese sword making, a clay mixture is put onto the blade, covering the spine area so that it cools slower when quenched (does not harden). The figure that is created on the blade is known as a "hamon" (pronounced "hah-mone"). The figure varies depending on the thickness and design of the clay covering. As Spicy notes in the video, the purpose is to leave a less hard (i.e. flexible and less brittle) spine so the blade does not break when striking a target. Lots of videos here on YT on creating the hamon in blades. Some steels lend themselves to more defined hamons than others. It's a traditional Japanese technique and they take it very seriously. They have a specified pattern for claying the blade with names for the shapes the clay creates. Very interesting stuff, and very beautiful when executed well.
Yes I know this is a video for simple explanations.
I made some kitchen ustensils blue. But is it food safe?
All you are doing is affecting the surface, once cleaned I do not think there would be any issues (however for clear reasons I can not say for sure) This is once you clean them or you use them on something acidic it will come off anyways.
I have seen this colour change on motorbike exhausts.... now l know why 😮
It's counterintuitive because blue light is higher frequency and thus hotter but the red light is what is being reflected and so the blue light is being absorbed - thus the red glow is the reflected light at the hotter temperature.
hello, is there a way I can turn the blue stainless steel back to normal?
It is only the surface so light apparition like sanding will remove it, you can use use chemicals and electrolysis this is knows as pickling.
@@spicy110 hello there, could you please suggest some agents to reverse this coloration? Sanding as in you mean rubbing sand or is it some kind of complex process. Unfortunately, I forgot an empty utensil on high flame at home and it turned blue the same that you are showing in this video. Could you please suggest how to turn it to normal again?
I got blue coloured steel with copper nitrate and ferrous nitrate solution
Why this happen and steel is 1075 carbon steel
So! What happens if steel is heated without oxygen around?
As far as I know it will just heat up and cool down with out colouring.
But does it work on all metal
some not all.
Imma make a purple knife with my oven
Tesla please do this for Cybertruck color options
I'm making 3D steel, OMG thanks
REMOUDOU!!!!!!!!
I came here to learn why steel changes colour and learnt why samurai swords are curved
That is a good thing right!?
I vote we name the rat Pinky.
Well if it was the brain it wouldn't be in my garage! 🤣
270 c =f 518 = purple
.
This is a very underrated vedio
Steel changes color because of God silly
Hey spicy that was interesting 🤔🤔🤔 as to 🐀 in garage bring your 🐱 in and the rat will be ohh🤬 no I'm outta here 😁
Light is made up of red, green, and blue light??? If you're going to make a video then you should make sure YOU know what you're teaching others to be correct. The human eye detects variations of red, green, and blue (trichromats) but white light is ALL colors including colors you cannot (literally) see. Those frequencies in the EM spectrum are there, but you cannot see them. Just like you can't see below or above the visible light SPECTRUM, there are colors within the visible spectrum that humans cannot see. Nevertheless, LIGHT is not made up of red, green, and blue light.
To the human eye, the only ones that really matter in this context for the basics is RGB as it can make up most of the colors the human eye can distinguish. I said red green blue "It is a spectrum" as in the spectrum of light, people can look into that themselves but in this basic context doesn't matter IMO. When you are teaching basics it is not about getting every single bit of info possible in, all you are doing is explaining a simple concept. I.e we teach people basic maths to start with and then move on to the more complex stuff. The problem with many people who teach is they are more focused on looking smart than teaching in a way that is easy to pick up.
you still havent stuck it to your bike
if any one likes to take it further
utube HEAT TREATMENT OF STEELS 1, HARDENING, TEMPERING, ANNEALING & NORMALIZING OF STEELSMARC LECUYER
Are you gonna answer the question!? I'm half way through your video and still just bla bla bla