Influence of Cr on Weld Solidification Cracking in Fe-15Mn-0.5C-3.5Al-xCr Alloys

Title
Influence of Cr on Weld Solidification Cracking in Fe-15Mn-0.5C-3.5Al-xCr Alloys
Authors
이창희
Keywords
solidification cracking; high Mn steel; welding; solidification; eutectic
Issue Date
2015-01
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 55, NO 1, Page. 257-263
Abstract
The solidification cracking sensitivity of Fe-15Mn-0.5C-3.5Al-xCr (x = 5, 12 mass%) alloys was evaluated using a longitudinal Varestraint test and compared with that of austenitic Fe-18Mn-0.6C alloy. Weld microstructures of Low Cr (5 mass%) and High Cr (12 mass%) alloys revealed duplex structures with a mixture of austenite and delta ferrite. The amounts of residual delta ferrite and (Cr, Fe, Mn)(23)C-6 carbide remarkably increased with increasing Cr content. A small amount of Cr addition (5 mass%) provided negligible influence on the solidification cracking susceptibility. However, the welds of high Cr alloys demonstrated excellent resistance to solidification cracking due to healing by the eutectic liquid. The addition of Cr enhanced the formation of a low melting point (gamma + (Cr, Fe,Mn)(7)C-3) eutectic during solidification by increasing the eutectic formation temperature and simultaneously decreasing the eutectic C content.
URI
http://hdl.handle.net/20.500.11754/21344https://www.jstage.jst.go.jp/article/isijinternational/55/1/55_257/_article
ISSN
0915-1559
DOI
http://dx.doi.org/10.2355/isijinternational.55.257
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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