[MW:0] How Delta- Ferrite prevents Solidifacation Cracking/ Hot Cracking in SS??

Dear All,

Good Morning

I have query regarding the solidification Cracking.

Generallly, FeS the compound responsible for solidification cracking. Also Arsenic, Sulphur shows same phenomenon.

Now Delta- Ferrite in 3-8 FN proportion prevents hot cracking.

But how ?? In most of the books, it is written that, " Delta- Ferrite has tendency to lock the impurities".

But how Delta- Ferrite can be helpful for the prevention of hot cracking by locking the impurities??

Also, what happens if Delta- Ferrite is very low of the order of 0.5 FN or so or what happens if Delta-Ferrite is high of the order of 15 FN or so.

 

 

Dear All,

Please help me to find the answers.

 Thanks in advance.

 

Jignesh

 

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