• ## Bainite

It's not pearlite or martensite. A blog written by Mathew Peet.

## Density of Iron Carbide (Fe3C)

There are 4 molecules of Fe3C per unit cell. The cell is orthorombic, typical lattice parameters at room temperature are given below from Mehl etal, Trans AIMME, 1933.

Mass
——-

m = mass of 1 mole of unit cells
= 12 x FeRAM + 4 x CRAM
= 12 x 55.845 + 4 x 12.011 = 670.14 + 48.044
= 718.184 g/mol

Fe3C unit cell is 718.184 g/mol

Volume
——-
v = volume of 1 mole of unit cells
= AV x a x b x c
= 6.0221415 × 1023 x 4.518 x 5.069 x 6.736 x 10-30
= 9.2901×10-5 m3

Density
——-
d = density
= m/v
= 0.71814 kg / 9.2901 x 10-5 m3
= 7730.14 kg/m3

## Steel Poll 2

To maximise clear up any confusion I bring you the second poll. Please justify your selection in the comments section.

Second Steel Poll

Second Steel Pole

## Steel Poll

I created a poll so that we can decide once and for all which is the best phase of steel. You can see the poll below, next to the pole. Please feel free to justify your answer below.

 Take Our Poll Steel Poll Steel Pole

## Note for Rupert Murdoch

According to the BBC, Rupert Murdoch will try to block google from using `news’ content from his companies. As you can read here, he can already do this easily by just requesting that google remove his websites from their news index by using the google news opt-out form. Even better he can create a robots.txt file on each of his webservers to prevent indexing of his site by any other webcrawler which respects the `Robots Exclusion Protocol’.

Another alternative is to use a header like this on each page he doesn’t want to be indexed:

```<html>