발간논문

Home > KJMM 논문 > 발간논문

Vol.34, No.12, 1576 ~ 1585, 1996
Title
Research Paper - Transformations - : Solidification and δ- ferrite Formation of High Alloyed Austenitic Stainless Steel
김선구Sun K . Kim, 김종완Jong W . Kim, 심상대Sang D . Shim, 이연용Yun Y . Lee
Abstract
In order to investigate the cause of increase in δ-ferrite content from 9.1 to 14.3% with increasing the Cr_(eq)/Ni_(eq) ratio from 1.48 to 1.71 in type 309S stainless steel, the solidification path and transformation of δ-ferrite to austenite were studied by interrupted quenching experiment of unidirectional solidification.δ-ferrite in 309S stainless steel precipitates with primary dendrite irrespective of Cr_(eq)/Ni_(eq) ratio but the formation mechanism of austenite is different depending on Cr_(eq)/Ni_(eq) ratio. Stainless steel at 1.48 of Cr_(eq)/Ni_(eq) starts to form austenite from liquid remained at interdendrites at 1397℃ and completes solidification at 1357℃, but stainless steel at above 1.48 of Cr_(eq)/Ni_(eq) forms austenite by peritectic reaction before solidification. As the Cr_(eq)/Ni_(eq) ratio increased from 1.48 to 1.71, maximum δ-ferrite content formed before austenite formation increased from 54 to 75% and austenitic formation temperature decreased from 1390 to 1383℃.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.