Carbon Content decrease after Cold-forging process?

In summary, there was an abnormality at work with regards to the Carbon Content of a raw material used for cold-forging. The expected carbon content was 0.08-0.13, but after the process, it decreased to 0.041. There was no explanation for this, but it is possible that segregation of carbon atoms occurred during the process, especially if the material was heated for a long time. However, this should not be a problem unless the material is tested after being heated for a long time. The person who discovered this is still stumped and looking for an explanation.
  • #1
soo33y
1
0
Hi guys,

I've come across an abnormality at work with regards to Carbon Content.

The raw material used was 1010 CHQ which should have a carbon content of 0.08 - 0.13.

However after going through a cold-forging process, we tested the final product and found that the Carbon Content decreased to 0.041.

How did this happen? Is it possible? Can someone explain?

Really stumped at this stage.

Cheers,
Daniel.
 
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  • #2
No explanation. That sounds astounding to me.

Maybe there was some segregation and the tiny place where you measured was chosen unluckily?
 
  • #3
segregation may lead to C atoms migrating to surface of the material.
But this should not be a problem unless the material is heated for a long time.
If heated for a long time and tested after heating inside the material, the result of yours seems to be acceptable.
 

Related to Carbon Content decrease after Cold-forging process?

What is the cold-forging process?

The cold-forging process is a manufacturing technique used to shape metal at room temperature. It involves placing the metal in a die and applying compressive forces to change its shape without heating it.

Why does the carbon content decrease after cold-forging?

The carbon content decreases after cold-forging because the compressive forces applied during the process cause the metal to elongate and thin out, resulting in a decrease in carbon concentration. Additionally, the high pressure and friction generated during cold-forging can also lead to the loss of carbon through oxidation.

How does the decrease in carbon content affect the properties of the metal?

The decrease in carbon content can have a significant impact on the properties of the metal. Carbon is a key element in steel, and its absence can result in reduced strength, hardness, and wear resistance. It can also affect the metal's ability to be heat-treated and its overall machinability.

Can the carbon content be controlled during the cold-forging process?

Yes, the carbon content can be controlled to some extent during the cold-forging process. The selection of the die material, lubrication, and cooling techniques can help minimize the loss of carbon. Additionally, controlling the forging temperature and pressure can also help maintain the desired carbon content.

Are there any ways to restore the carbon content after cold-forging?

Yes, there are some methods to restore the carbon content after cold-forging. One way is through a secondary heat treatment process, where the metal is heated to a specific temperature and then cooled to restore the desired carbon concentration. Another method is through the addition of carbon-rich coatings or surface treatments.

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