Advanced Search  
JWJ > Volume 29(1); 2011 > Article
Journal of KWJS 2011 February;29(1) :65-73.
Published online March 4, 2011.
Microstructural Characteristics of 800 ㎫ Grade High Strength Steel Weld Metals
Jaehee Lee, Sanghoon Kim, Byunghyun Yoon, Hwantae Kim, Sangcheol Kil, Changhee Lee





Correspondence:   Published online March 4, 2011
ABSTRACT
  Microstructural characteristics of two high strength (600 ㎫ & 800 ㎫) weld metals produced by flux-cored arc welding process (FCAW) were evaluated. The 600 MPa grade weld metal was consisted of 75% acicular ferrite and 25% ferrite which was formed at relatively high temperature (grain boundary ferrite, widmanstatten ferrite, polygonal ferrite). However, the 800 ㎫ grade weld metal was composed of about 85% acicular ferrite and 15% low temperature forming phases (bainite, martensite). The prior austenite grain size of 800 ㎫ grade weld metal was decreased by solute drag force. The compositions and sizes of inclusions which are the dominant factors for the formation of acicular ferrite were analyzed by a transmission electron microscopy (TEM). In both 600 ㎫ and 800 ㎫ grade weld metals, the inclusions were mainly consisted of Ti-oxide and Mn-oxide, and the average size of inclusions was 0.7 ㎛. The 800 ㎫ grade weld metal exhibited higher tensile strength and similar toughness compared with the 600 ㎫ grade weld metal. This result is mainly due to a higher fraction of low temperature products and a lower fraction of grain boundary ferrite in the 800 ㎫ grade weld metal.
Keywords: High strength weld metal;Acicular ferrite;Lath size;Inclusions
TOOLS
PDF Links  PDF Links
Full text via DOI  Full text via DOI
Download Citation  Download Citation
CrossRef TDM  CrossRef TDM
  E-Mail
Share:      
METRICS
1,008
View
0
Download
Related articles
Characteristics of Sulfide Stress Cracking of High Strength Pipeline Steel Weld by Heat Input  2018 June;36(3)
Microstructure and Mechanical Properties of Reheated Zones in the Multi-pass Weld Metal of High-Strength Steel  2017 December;35(6)
Microstructure and Mechanical Properties of Gas Metal Arc Brazed Joint of DP Steel with Cu-Si Filler Metal  2016 October;34(5)
A Study on HAZ Softening Characteristics of Fiber Laser Weldment for High-Strength Steel   2015 December;33(6)
The Effects of Microstructure on Cold Crack in High-Strength Weld Metals  2014 February;32(1)
Characteristics of Sulfide Stress Cracking of High Strength Pipeline Steel Weld by Heat Input  2018 June;36(3)
Microstructure and Mechanical Properties of Reheated Zones in the Multi-pass Weld Metal of High-Strength Steel  2017 December;35(6)
Microstructure and Mechanical Properties of Gas Metal Arc Brazed Joint of DP Steel with Cu-Si Filler Metal  2016 October;34(5)
A Study on HAZ Softening Characteristics of Fiber Laser Weldment for High-Strength Steel   2015 December;33(6)
The Effects of Microstructure on Cold Crack in High-Strength Weld Metals  2014 February;32(1)
e-sciencecentral
Register for e-submission
Register here to access the e-submission system of Journal of KWJS for authors and reviewers.
Manuscript Submission
To submit a manuscript, please visit the Journal of KWJS e-submission management system at http://submit.e-jwj.org, read the Instructions for Authors, and log into the Journal of KWJS e-submission system. For assistance with manuscript submission, please contact: koweld@kwjs.or.kr.
Free archive
Anyone may access any past or current articles without logging in.
Editorial Office
The Korea Science and Technology Building, New B/D, Room 503
Teheran-ro 7-gil, 22(635-4, Yeoksam-Dong), Gangnam-gu, Seoul 06130, Korea
TEL : +82-2-538-6511    FAX : +82-2-538-6510   E-mail: koweld@kwjs.or.kr
Browse Articles |  Current Issue |  For Authors and Reviewers |  About
Copyright© by The Korean Welding and Joining Society. All right reserved.