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

• Yoo Jaehong

  Division of Materials Science and Engineering, Hanyang University

• Kim Bongyoon

  Division of Materials Science and Engineering, Hanyang University

• Jeong Yoodam

  Division of Materials Science and Engineering, Hanyang University

• Park Younghwan

  POSCO Technical Research Lab

• Lee Changhee

  Division of Materials Science and Engineering, Hanyang University

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 δ ferrite. The amounts of residual δ ferrite and (Cr, Fe, Mn)₂₃C₆ 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 (γ + (Cr, Fe,Mn)₇C₃) eutectic during solidification by increasing the eutectic formation temperature and simultaneously decreasing the eutectic C content.

Journal

• ISIJ International

  ISIJ International 55 (1), 257-263, 2015

  The Iron and Steel Institute of Japan

Keywords

• solidification cracking
• high Mn steel
• welding
• solidification
• eutectic

Details

• CRID: 1390282681465837696
• NII Article ID: 130004734509
• DOI: 10.2355/isijinternational.55.257
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/55/1/55_257/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed