Register to reply

Addition of carbon to cast iron beyond 6.67%

by velmurugan
Tags: >6.67%, 667%, addition, carbon, cast, cast iron, iron
Share this thread:
velmurugan
#1
Feb15-14, 10:08 AM
P: 1
can any one please give me the answer for addition of carbon to cast iron beyond 6.67%..
Phys.Org News Partner Engineering news on Phys.org
An innovative system anticipates driver fatigue in the vehicle to prevent accidents
Squink personal factory aims to make circuit prototyping easy
Catching grease to cut grill pollution
Baluncore
#2
Feb19-14, 07:19 PM
Sci Advisor
Thanks
P: 1,715
The iron compound with most carbon by weight, 6.67%, is cementite, Fe3C.
Any carbon added beyond that will form flakes of graphite. Those flakes reduce the useful properties of cast iron by making it softer and more brittle.

It is also quite difficult to make cast iron with higher carbon than cementite because it burns. If there were not much better and lower cost materials, it could be formed using powder metallurgy techniques.

There is no advantage in making cast iron with more than 6.67% carbon.
AlephZero
#3
Feb20-14, 08:08 PM
Engineering
Sci Advisor
HW Helper
Thanks
P: 6,922
Quote Quote by Baluncore View Post
Any carbon added beyond that will form flakes of graphite. Those flakes reduce the useful properties of cast iron by making it softer and more brittle.
...
There is no advantage in making cast iron with more than 6.67% carbon.
That depends what you want to use it for. I used to pass an iron foundry every day on the way to work, where that was their speciality product.

http://en.wikipedia.org/wiki/White_i...able_cast_iron

Baluncore
#4
Feb20-14, 10:18 PM
Sci Advisor
Thanks
P: 1,715
Addition of carbon to cast iron beyond 6.67%

@ AlephZero.
Malleable cast iron has only about 2.5% carbon by weight.

You failed to quote the first line of my post.

I know of no useful cast iron that is composed of only iron carbide with graphite.
Maybe you should examine the phase diagram for Fe – C near the top of the page you link to.
Do you know of any cast iron with greater than 6.67% carbon?


Register to reply

Related Discussions
How to clean cast iron fry pan Chemistry 3
Cast iron and brittleness Materials & Chemical Engineering 4
Cast-iron cylinder Introductory Physics Homework 0
As strong as cast iron but lighter? Materials & Chemical Engineering 1
Why iron from a bloomery has less carbon than iron from a blast furnace? General Engineering 0