Paper Title:
Study in Simulated Heat-Affected Zone of Ship Steel
  Abstract

The experiments were carried out upon the determination of simulated heat-affected zone continuous cooling transformation (SH-CCT) diagrams, the characteristics of microstructure and Vickers hardness of SH-CCT specimens, and impact toughness in simulated coarse grain heat-affected zone (CGHAZ) of ship steels under different heat input based on physical simulation. The SH-CCT diagram reveals that bainite is always obtained in a wide range of cooling rates. When the maximum cooling rate reaches 100 °C/s (t8/5=3 seconds), the maximum fraction of martensite (8%) is obtained and the microstructures mainly consist of lath bainite and the hardness is only 255 HV. This demonstrates that the steel has a low quench-hardening tendency and excellent resistance to cold cracking. There are no obvious hardening and softening phenomena in simulated CGHAZ. Test results of impact toughness under different heat input in simulated CGHAZ show that the impact energies reach over 30 J at -40 °C when t8/5 is less than 20 s, meeting the stipulated requirements of ship steel (≥22 J at -40 °C) but no great allowance. Thus, to meet the requirement of properties during welding, it is proposed to choose t8/5 ranging from 5 to 20 s, correspondently the line energies ranging from 14 to 37 KJ/cm for 30 mm thick plate.

  Info
Periodical
Advanced Materials Research (Volumes 228-229)
Edited by
Quanjie Gao
Pages
1196-1200
DOI
10.4028/www.scientific.net/AMR.228-229.1196
Citation
W. Y. Liu, J. B. Liu, C. M. Zhu, H. Wang, "Study in Simulated Heat-Affected Zone of Ship Steel", Advanced Materials Research, Vols. 228-229, pp. 1196-1200, 2011
Online since
April 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Young Kook Lee, Jin-Myung Hong, Chong Sool Choi, Jae Kon Lee
Abstract:Effects of niobium content and cooling rate on ferrite and bainite start temperatures (Ar3, Bs) and microstructural features have been...
65
Authors: J.S. Kang, S.S. Ahn, C.Y. Yoo, Chan Gyung Park
Abstract:In the present study, focused ion beam (FIB) technique was applied to make site-specific TEM specimens and to identify the 3-dimensional...
73
Authors: Guo Bin Li, Zheng Zhi Zhao, Di Tang
Abstract:The microstructure evolution of 780 MPa hot dip galvanized dual-phase (DP) steel at heating stages of the annealing process was analyzed...
1331
Authors: Sadegh Moeinifar
Abstract:The objective of this paper is to study the influence of second peak temperature during simulated welding on properties of the subcritically...
1850
Authors: Xin Jie Di, Dan Xu, Yong Chang Liu
Chapter 3: Materials Forming, Machining and Joining
Abstract:The microstructure and carbide precipitate of simulated coarse grain heat affected zone(CGHAZ) in modified high Cr ferritic heat-resistant...
1320