Hi,
We have come across, with very low delta ferrite ( 0.5- 1.5%) in the weld, leading to cracking & failure of components. With high % of delta ferrite also (10%), cracking is observed (even during storage). Minimum 3% is required to avoid fissuring. Low and high FN-both are not advisable. I can explain afterwards, how it prevents.
Regards,
Vaidehi Ganesan.
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----- Original Message -----From: jignesh makwanaSent: Wed, Jul 21, 10 9:43Subject: [MW:0] How Delta- Ferrite prevents Solidifacation Cracking/ Hot Cracking in SS??Dear All,Good MorningI 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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