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Heat treatment is a very general topic name. Could we find a more specific name for this page, if we wanted a topic on just the heat treatment of metals? Hardening (metallurgy) is kind of that, but is only a part of it. — Sverdrup 8 July 2005 07:44 (UTC)
This article, as it currently stands, is clearly written from the viewpoint of an edged weapons fan. There is little technical information (even in a form suitable for a layman) about, for instance, ferrous metallurgy (a murky reference to crystals is about it), and none relevant to non-ferrous metallurgy.
This is a tremendously important topic bearing on (to pick only a few): welding (not a good idea for items which depend on proper heat treatment for their properties -- unless it's followed by appropriate heat treatment), construction (eg, mild steel beams and columns), machinery (eg, automobiles, engines generally, ...). WP should have a better article. Perhaps someone could walk through a text and paraphrase? ww 19:46, 14 December 2005 (UTC)
What about measuring hardness? 178.111.185.170 ( talk) 12:41, 27 September 2012 (UTC)
Well, i'm an engineering student myself. Regarding this Heat Treatment for metal, i think we should include the Metal-Carbon Phase Chart which determine the heating temperature of metal base on its carbon percentage to achieve particular micro structure, this is really important.-- Dehanz 18:28, 9 October 2006 (UTC)
Phase diagrams describe alloy systems in a state of equilibria, which is not the case during heat treatment. A T-T-T diagram is much more useful than a phase diagram during heat treating. Phase diagrams are reletively unimportant in heat treatment as kinetics effect the process (i.e. the times involved in the steps are not infinite). Also, a Fe-C diagram would be too narrow for this article. Save the phase diagram for steel, phase diagram, or heat treatment of steel. Iepeulas 17:33, 18 October 2006 (UTC)
Hi. I can't edit the page over this because i'm not sure, but i think i see an error in the article that requires better knowledge than mine to ascertain as such: it says that "during annealing, small grains recrystallize to form larger grains." I've been a blacksmith for some years now and have always been under the impression that it was the other way around. if this is not the case, i feel like a moron and stand corrected. however, i thought i'd better point it out, just in case. Hephaestus III ( talk) 03:07, 26 May 2010 (UTC)
There seems to be quite a bit of information that is missing from this article. I know it's suppose to be a summary, but there is a lot of info that seems relevant to understanding this complex subject. For instance, hardenability of metals, as well as the effects of carbon on the maximum and minimum hardness of steels, is not mentioned. Pearlite grain size, which is formed during annealing, is mentioned, but not austenite grain size, which forms due to temperature and ultimately determines the martinsite grain size, also is not covered. The three differing phases of steel, namely austenite, ferrite, and cementite, are not well described, nor are the differing microstructure which the heat treating produces, like pearlite, martinsite and bainite. Many other forms of heat treatment should also be summarized here, like spheroidizing, austempering, martempering and stress relieving.
I'll freshen up on my books, and try to add some stuff to this article within the next few weeks. Zaereth ( talk) 03:19, 20 November 2010 (UTC)
I've been giving this quite a bit of thought while reviewing my sources. I find it hard to give an adequate description of heat treating without giving a brief description of the physical processes that make it possible, in particular, dissolution/solubility, diffusion, precipitation and allotropy. I think a couple of paragraphs could probably give a decent description of the roles these phenomena play in heat treating. I'd probably follow that up with a brief description of the roles played by composition, temp, and time, such as the difference between eutectoid versus hyper-eutectoid, microstructure and phase changes. Then I would probably have a section about the various generalized techniques, much like is already there, but to include such things as stress-relieving and surface hardening. The main addition I would provide there is to describe how, while these techniques are often applied similarly to different alloys, the objectives (desired results) are often very different. (For instance, quenching steel will give very different results than quenching aluminum.)
Once all of the basic information is in place, it should be much easier to explain the processes as applied to different metals. I'd probably start a section beginning with allotropic metals, such as carbon steel, alloy steel, cast iron and titanium and iron-nickel alloys. Then move on to alloys that harden by precititation, like copper, magnesium, lead and precious metal alloys. I'd probably finish up with special cases, like mangalloy, in which the ductility can be altered, but the hardness can't. Or uranium, which is heat treated to prevent corrosion.
Lastly, a quick description of how heat treatment is applied to non-metallics, like glass should be included.
How does that sound? Zaereth ( talk) 19:12, 18 March 2011 (UTC)
I'm not sure if this is the right place to bring this up. The iron-carbon phase diagram, as nice as it may be, is slightly inaccurate. The melting point for a hypereutectic cast iron should have a much steeper line. On the pure iron side, the melting point looks correct at 1535 degrees C, but a cast iron with 6.67% carbon will liquify at 1837 degrees C. It may not be worth mentioning, as these cast irons do not seem to find much use, but, if someone who is good with graphics comes along, perhaps it would be simple enough to correct. Zaereth ( talk) 20:37, 25 April 2011 (UTC)
The word 'austenized' is used multiple times in the article, but is not explained itself. Not being an expert in metals, I'm not going to alter the article but I do think the word should be explained, and perhaps deserves a separate section or paragraph. Also, what's the correct spelling? Austenized or Austenitized? — Preceding unsigned comment added by ErikBongers ( talk • contribs) 21:56, 17 January 2019 (UTC)
This article was the subject of an educational assignment supported by
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The above message was substituted from {{IEP assignment}}
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PrimeBOT (
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If ore heat treats at 1250° and stainless 2250° would it be that alloy is at 1150? 2601:989:4100:9C20:D846:A745:B5C6:F1E9 ( talk) 16:37, 13 February 2023 (UTC)
![]() | This article is written in American English, which has its own spelling conventions (color, defense, traveled) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus. |
![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
Heat treatment is a very general topic name. Could we find a more specific name for this page, if we wanted a topic on just the heat treatment of metals? Hardening (metallurgy) is kind of that, but is only a part of it. — Sverdrup 8 July 2005 07:44 (UTC)
This article, as it currently stands, is clearly written from the viewpoint of an edged weapons fan. There is little technical information (even in a form suitable for a layman) about, for instance, ferrous metallurgy (a murky reference to crystals is about it), and none relevant to non-ferrous metallurgy.
This is a tremendously important topic bearing on (to pick only a few): welding (not a good idea for items which depend on proper heat treatment for their properties -- unless it's followed by appropriate heat treatment), construction (eg, mild steel beams and columns), machinery (eg, automobiles, engines generally, ...). WP should have a better article. Perhaps someone could walk through a text and paraphrase? ww 19:46, 14 December 2005 (UTC)
What about measuring hardness? 178.111.185.170 ( talk) 12:41, 27 September 2012 (UTC)
Well, i'm an engineering student myself. Regarding this Heat Treatment for metal, i think we should include the Metal-Carbon Phase Chart which determine the heating temperature of metal base on its carbon percentage to achieve particular micro structure, this is really important.-- Dehanz 18:28, 9 October 2006 (UTC)
Phase diagrams describe alloy systems in a state of equilibria, which is not the case during heat treatment. A T-T-T diagram is much more useful than a phase diagram during heat treating. Phase diagrams are reletively unimportant in heat treatment as kinetics effect the process (i.e. the times involved in the steps are not infinite). Also, a Fe-C diagram would be too narrow for this article. Save the phase diagram for steel, phase diagram, or heat treatment of steel. Iepeulas 17:33, 18 October 2006 (UTC)
Hi. I can't edit the page over this because i'm not sure, but i think i see an error in the article that requires better knowledge than mine to ascertain as such: it says that "during annealing, small grains recrystallize to form larger grains." I've been a blacksmith for some years now and have always been under the impression that it was the other way around. if this is not the case, i feel like a moron and stand corrected. however, i thought i'd better point it out, just in case. Hephaestus III ( talk) 03:07, 26 May 2010 (UTC)
There seems to be quite a bit of information that is missing from this article. I know it's suppose to be a summary, but there is a lot of info that seems relevant to understanding this complex subject. For instance, hardenability of metals, as well as the effects of carbon on the maximum and minimum hardness of steels, is not mentioned. Pearlite grain size, which is formed during annealing, is mentioned, but not austenite grain size, which forms due to temperature and ultimately determines the martinsite grain size, also is not covered. The three differing phases of steel, namely austenite, ferrite, and cementite, are not well described, nor are the differing microstructure which the heat treating produces, like pearlite, martinsite and bainite. Many other forms of heat treatment should also be summarized here, like spheroidizing, austempering, martempering and stress relieving.
I'll freshen up on my books, and try to add some stuff to this article within the next few weeks. Zaereth ( talk) 03:19, 20 November 2010 (UTC)
I've been giving this quite a bit of thought while reviewing my sources. I find it hard to give an adequate description of heat treating without giving a brief description of the physical processes that make it possible, in particular, dissolution/solubility, diffusion, precipitation and allotropy. I think a couple of paragraphs could probably give a decent description of the roles these phenomena play in heat treating. I'd probably follow that up with a brief description of the roles played by composition, temp, and time, such as the difference between eutectoid versus hyper-eutectoid, microstructure and phase changes. Then I would probably have a section about the various generalized techniques, much like is already there, but to include such things as stress-relieving and surface hardening. The main addition I would provide there is to describe how, while these techniques are often applied similarly to different alloys, the objectives (desired results) are often very different. (For instance, quenching steel will give very different results than quenching aluminum.)
Once all of the basic information is in place, it should be much easier to explain the processes as applied to different metals. I'd probably start a section beginning with allotropic metals, such as carbon steel, alloy steel, cast iron and titanium and iron-nickel alloys. Then move on to alloys that harden by precititation, like copper, magnesium, lead and precious metal alloys. I'd probably finish up with special cases, like mangalloy, in which the ductility can be altered, but the hardness can't. Or uranium, which is heat treated to prevent corrosion.
Lastly, a quick description of how heat treatment is applied to non-metallics, like glass should be included.
How does that sound? Zaereth ( talk) 19:12, 18 March 2011 (UTC)
I'm not sure if this is the right place to bring this up. The iron-carbon phase diagram, as nice as it may be, is slightly inaccurate. The melting point for a hypereutectic cast iron should have a much steeper line. On the pure iron side, the melting point looks correct at 1535 degrees C, but a cast iron with 6.67% carbon will liquify at 1837 degrees C. It may not be worth mentioning, as these cast irons do not seem to find much use, but, if someone who is good with graphics comes along, perhaps it would be simple enough to correct. Zaereth ( talk) 20:37, 25 April 2011 (UTC)
The word 'austenized' is used multiple times in the article, but is not explained itself. Not being an expert in metals, I'm not going to alter the article but I do think the word should be explained, and perhaps deserves a separate section or paragraph. Also, what's the correct spelling? Austenized or Austenitized? — Preceding unsigned comment added by ErikBongers ( talk • contribs) 21:56, 17 January 2019 (UTC)
This article was the subject of an educational assignment supported by
Wikipedia Ambassadors through the
India Education Program.
The above message was substituted from {{IEP assignment}}
by
PrimeBOT (
talk) on 19:57, 1 February 2023 (UTC)
If ore heat treats at 1250° and stainless 2250° would it be that alloy is at 1150? 2601:989:4100:9C20:D846:A745:B5C6:F1E9 ( talk) 16:37, 13 February 2023 (UTC)