Comments for bainite

Comment on Dividing a line by Mathew

Mathew — Thu, 15 May 2008 20:25:31 +0000

I think it is trivial, I asked a friend and he said so too

He also showed me a simpler solution to the problem above.

Comment on Dividing a line by Rich

Rich — Thu, 15 May 2008 12:34:22 +0000

Ensure the first line’s at right angles using a compass and straightedge is possible, but it’s not trivial…

Comment on How do trees raise water? by Mathew

Mathew — Thu, 15 May 2008 07:30:01 +0000

Thanks for the comments. I believe that Capillary pressure is one of the forces that the plants use to move the water - using the surface tension is basically a free way to move the water. I　expect that the tubes can get smaller than the 30 microns I have quoted above, I　also haven’t seen any measurements of the contact angle between the xylem material and the water. I was surprised that there seems to be no definitive answer on this topic, not even a commonly agreed wrong idea.

I don’t believe that the trees would neglect any of the mechanisms available to them to lift water from the ground, it’s also interesting to wonder if they can transport water in a gaseous state, I read that generation of bubbles can be a problem for some trees, blocking off the xylem, that means that the water is very close to evaporating.

Comment on How do trees raise water? by Andrew K Fletcher

Andrew K Fletcher — Wed, 14 May 2008 08:40:45 +0000

Capillary action in trees would raise water around half a meter, because as you have correctly shown, the tubes inside the trees do no conform to the minute diameters required to raise water to the top of a sapling let alone a giant Californian redwood. Furthermore, capillary action is not a continual flow from the top of the tube into the atmosphere, but a rise inside the tube falling short of the top, so we can safely discount capillarity as a mechanism for explaining the bulk flow rates observed in trees.

http://www.thenakedscientists.com/forum/index.php?topic=1982.0

The discussion above deals with many of the problems and provides a simple yet powerful flow and return in trees driven by evaporation which in turn alters the density of the sap at the leaf providing a downward flow and a return flow that does address the observed flow rates in trees and plants.

Andrew K Fletcher

Comment on Good News for Ugly men and Beautiful women. by David Duncan

David Duncan — Mon, 12 May 2008 12:37:31 +0000

Yea. It is working out for me so far!

Comment on Some effects of Alloying elements in Steel by Daniel

Daniel — Tue, 06 May 2008 21:33:17 +0000

Dear Sir

I need to know the effect of Cu in steel, looking from the corrosion point of view, how it affects the steel if some Cu particles diffuse into it.

Thank you very much

Comment on Some effects of Alloying elements in Steel by Jaywant

Jaywant — Wed, 30 Apr 2008 18:04:06 +0000

In AISI 1070 steel,
( Carbon, C 0.650 - 0.750 % Manganese, Mn 0.600 - 0.900 %
Phosphorous, P <= 0.0400 % <= 0.0400 %
Sulfur, S <= 0.0500 % <= 0.0500 % )

If Mn increases to 1.25% to 1.5% ,will the steel more suseptible to cracking during quenching.
Section thickness 4 to 6 mm.
References

Comment on Tempering of Martensite by Mathew

Mathew — Tue, 29 Apr 2008 13:45:11 +0000

I don’t think it’s true that we will always get bainite during stage 2 tempering. The TTT diagram is for transformation from austenite, once transformed to martensite the starting microstructure will have an effect. It might be possible that some of these steels will form bainite, but I myself haven’t seen (but havent looked for!) the experimental evidence.

Looking for surface relief caused by the displacive transformation might be one thing to do, but this experiment should also probably be done in a dilatometer so that it is possible to distinguish bainite from any martensite that forms upon the cooling from the tempering temperature.

Comment on Dividing a line by roxspring

roxspring — Sat, 26 Apr 2008 14:28:13 +0000

Apparently the diagrams load fine if you’re reading from the original source. I was reading through google reader, which apparently didn’t bring the images through, and was very dry

At least now I have half an idea what you’re on about!

Comment on Dividing a line by mathew

mathew — Fri, 25 Apr 2008 19:18:24 +0000

Hmm did they not load? It pretty much requires on you being able to see the 3 I put. I think I even put `alt’ tags.

Comment on Dividing a line by Rob Oxspring

Rob Oxspring — Fri, 25 Apr 2008 18:43:58 +0000

Admittedly I tired after a grueling week at work but I can’t help feeling that a diagram would help this posting.

Hope all’s well,

Rob

Comment on Tempering of Martensite by Jim

Jim — Fri, 25 Apr 2008 17:08:02 +0000

during stage 2 the retained austenite should become banite, not just decompose into ferrite and cementite,check the TTT diagrams for isothermal transformations of hypoeuectoid steels

Comment on Some effects of Alloying elements in Steel by MANUJ KAUSHESH

MANUJ KAUSHESH — Mon, 07 Apr 2008 11:35:23 +0000

Dear friends,
As Asked by Mr P.K. Pandey, I have to submit some Metallurgical facts:
Si & Mn in Steel melts have a definite effect on Viscocity of Low Carbon Steel. Apart from Shrinkage behaviour and Banding tendencies, Viscocity of steel is also affected by these elements.
Mn Increases Viscocity and Silicon has a little effect on Viscocity. However, Surface tension of steel is reduced by manganese and is increased by Si addition

Regards

Comment on Example script: Making thumbnails by HARRY

HARRY — Sat, 05 Apr 2008 21:49:23 +0000

But what if the images do not have a uniform starting size, and a uniform set of thumbnails is required?

Comment on Applying for a Fellow by Mathew

Mathew — Wed, 02 Apr 2008 13:40:24 +0000

I’m surprised that I didn’t get any response as yet. I expect that many of the colleges are waiting until closer to the end of April so they know how much money they can afford to offer.

Comment on Applying for a Fellow by Saurabh Kundu

Saurabh Kundu — Tue, 01 Apr 2008 11:03:37 +0000

Hi Mathew,

I am pretty impressed that you have come up with this. I am sure many colleges in Cambridge will now use it. How ever I am little surprised to see that the font size in item number 3 in the application form you have made is smaller than the rest of the items. I guess you should put item number 3 in large block capital letters.

Think about this change and oh … important …. also ask if they can arrange for a washing machine and a microwave in the lab from your grant, these will come handy for research.

Saurabh.

Comment on Watch Japanese TV anywhere. by Japanese TV

Japanese TV — Fri, 21 Mar 2008 03:09:16 +0000

You can watch Japanese TV live from Japan using a slingbox from slingmedia. You can have a slingbox hosted in Japan here http://watchjapanesetv.com hosting service starts 31st March 2008.

Comment on What is Bainite? How Bainite was named. by alok goyle

alok goyle — Thu, 20 Mar 2008 14:42:17 +0000

my question is whether a fine bainite structure in the core of a case carburised steel is a good heat treatment process?

Comment on Using gnuplot for programming by Philipp K. Janert

Philipp K. Janert — Thu, 20 Mar 2008 03:49:16 +0000

I saw your postings regarding Gnuplot, and thought you might be interested to know that there is now a book on it: “Gnuplot in Action”. You can pre-order it directly from the publisher: Manning: Gnuplot in Action.

If you want to learn more about the book and the author, check out my book page at Principal Value - Gnuplot in Action.

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Comment on Some effects of Alloying elements in Steel by Mathew

Mathew — Sun, 24 Feb 2008 18:11:11 +0000

Start with the Book bainite in steels. You can find it at http;//www.msm.cam.ac.uk/phase-trans/