|WikiProject Metalworking||(Rated C-class, Top-importance)|
||This article may be too technical for most readers to understand. (September 2010)|
- 1 Merge cold work into work hardening
- 2 drilling and work hardening
- 3 Removal of red links
- 4 Proposed merge from cold forming
- 5 Lede too jargonistic?
- 6 Confusing Yield-Stress Formula
- 7 Getting the word right.
- 8 Imaginary Dislocations
- 9 New Work Hardening Stress-Strain Diagram
- 10 Work hardening at room temperature of Indium
Merge cold work into work hardening
drilling and work hardening
Someone might want to add information about work hardening and drilling. When drills fail to penetrate some steel alloys, the heat buildup can toughen the material and make it harder to drill even more.
- Not the same thing at all. Work Hardening is due to plastic deformation. What this note is describing is a purely thermal process and is not in any way shape or form cold work or work hardening. What usually happens is the drill bit itself loses it's heat treatment and the hard alloy steel wears away the sharpened edge of the drill bit. This rapidly becomes a feedback loop - the dull bit causes more frictional heating causing more dulling, and a broken bit follows in rapid order. —Preceding unsigned comment added by 184.108.40.206 (talk) 04:16, 15 March 2009 (UTC)
- Actually, I think you are both right, depending on the case. Unintentional work hardening does sometimes occur in machining, with annoying results. — ¾-10 02:41, 22 January 2010 (UTC)
I have considered to remove the redlinks without altering the content i will just remove the internal link format to make the page look a bit neat and informative. Any comments regarding this are welcome. Kalivd (talk) 15:21, 21 July 2008 (UTC)
- I went through and linked some of the red links. The ones that are left I think can just be removed. Wizard191 (talk) 15:41, 21 July 2008 (UTC)
Proposed merge from cold forming
Lede too jargonistic?
I noticed that the lede here seems to be ripped from a third or fourth year chemistry book. Perhaps we would do better to simplify the terms in the lede, and then explain in more detail in the article itself. Throwaway85 (talk) 03:42, 17 October 2009 (UTC)
- You are right, the intro should be more accessible. I'll see what I can do, but it's probably a long way off. Wizard191 (talk) 22:44, 17 October 2009 (UTC)
Confusing Yield-Stress Formula
In the "Quantification of work hardening" section, a formula for yield stress, T, is given, with a square-root dependency. Then right after the formula is introduced, it says, "The material exhibits high strength if there are either high levels of dislocations (greater than 10^14 per m^2) or no dislocations."
I believe it's the paragraph that's right and the formula is wrong, because it's incomplete. The formula needs boundary conditions, because clearly when the dislocation density is zero, the yield stress is very high (I presume because the atomic bonds are maximized in the crystal lattice), but the formula predicts a minimum for yield stress.
Getting the word right.
The first sentence suggests that material that is work hardened is strengthened. Uhhh, isn't the reverse true? For example, doesn't work-hardening of mild steel actually make it more brittle and somewhat weaker? —Preceding unsigned comment added by 220.127.116.11 (talk) 09:34, 13 January 2011 (UTC)
- "Hardening" in this sense is actually a misnomer, because work hardening processes don't actually harden the material, they increase its strength. The sentence is right, the terminology is just somewhat misleading. Wizard191 (talk) 22:11, 13 January 2011 (UTC)
I'm not confident the section on dislocations needed to be saying explicitly that they don't exist. They exist as much as a wave on the ocean or a warm front in the atmosphere do. While you could reinterpret the situation into one where they are all simply variations in some larger medium/object, it seems a bit...obtuse. And they definitely aren't as simple as vacancies. Darryl from Mars (talk) 06:25, 18 June 2012 (UTC)
New Work Hardening Stress-Strain Diagram
There is an obvious and easily understood way to illustrate strain hardening using a stress-strain curve. The diagram on p.9 of R. Hill's "The Mathematical Theory of Plasticity" does it perfectly, and it, or it's equivalent, should be integrated into this page: Hill's Diagram - Koenig (talk) 18:59, 2 August 2013 (UTC)
Work hardening at room temperature of Indium
As this relates to my PhD project, I've done some literature review on this. Reference  does NOT state that Indium doesn't work harden at room temperature - it only states that it doesn't work harden at cryogenic temperatures: "The indications are that the mechanism which causes work-hardening ceases to become operative at low temperature when moderate hydrostatic pressures are present." A different paper that I've found by R. Darveaux and I. Turlik (http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=113309) demonstrates work hardening in indium at room temperature, and in the conclusion states: "It was apparent that both work hardening and recovery processes occur in indium at room temperature..." -- Highwind888, the Fuko Master 01:20, 5 December 2013 (UTC)
- Feel free to change the article and cite the refs accurately. The current version talks about "low temperatures" but doesn't make clear that cryo-level is apparently what they meant by low. Maybe you can rewrite those sentences to clarify. — ¾-10 02:13, 5 December 2013 (UTC)