Study on Property and Microstructure in HAZ of High-Strength Abrasion-Resistant Steel

Abstract:

In this paper, a type of the high-strength abrasion-resistant steel-NM360 has been studied with the aid of the modern physical simulation technology to solve the problem of its poor weldability. In the experiment, the welding thermal cycles under different cooling conditions with the peak heating temperature of 1320oC were simulated via the Gleeble-1500D thermal/mechanical simulator. The SH-CCT diagram of NM360 has been established by investigating the microstructure transformation course and the hardness of the welded heat-affected zone (HAZ) near fusion line during different cooling process. Moreover, the impact toughness and fracture in HAZ with different cooling rate have been studied. The established SH-CCT diagram and impact toughness in HAZ provide the referential experimental basis for selecting proper welding parameters. At last, the welding parameters for NM360 steel are determined with the aid of nomography of carbon dioxide gas shielded arc welding and empirical formula.

• Periodical: Key Engineering Materials (Volumes 306-308)
• Pages: 947-952
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.306-308.947
• Online since: March 2006
• Authors: Ji Tai Niu, Wei Feng Huang, Jing Jun Xu, Yong Liang Guo
• Keywords: Abrasion Resistant Steel, Cold Crack, SH-CCT Diagram, Weld HAZ, Welding Parameters

References

[1] Jitai Niu. Physical Simulation in Materials and Hot-working. The first edition. National Defence Industry Press, 1999: 18-88.

[2] Jianmin Tong. Research Development of Abrarion-resistent Steel. Water Conservancy and Power Machine. 2003, Vol. 2: 1-5.