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Analysis and prevention of vertical cracking phenomena during deep drawing of hot-rolled SG295 steel strips

Title
Analysis and prevention of vertical cracking phenomena during deep drawing of hot-rolled SG295 steel strips
Authors
Lee, SLee, CGKwon, DPark, SHKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-1996
Publisher
MINERALS METALS MATERIALS SOC
Abstract
Microscopic examination and microstructural analysis of vertical cracking phenomena in deep-drawn cups of hot-rolled SG295 steel strips were carried out in this study. Microvoids initiated preferentially at grain-boundary carbides were observed to form intergranular cracks. These grain-boundary carbides were identified as (Fe,Mn)(3)C carbides. The morphology of carbides was varied with processing variables, e.g., killing method and coiling temperature. In the Al-killed steels, the carbide shape tends to change from film type to bulk type, which may be beneficial to elongation and consequently formability. In addition, as the coiling temperature increased, the amount of banded pearlite structures and bulk-type carbides increased. These findings suggest that the deep drawability can be improved by modifying the carbide morphology in the microstructures.
URI
http://oasis.postech.ac.kr/handle/2014.oak/21590
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 27, no. 5, page. 1241 - 1250, 1996-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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