Structure and Performance of Fe-Al Alloy Layer for Twin Wire Surfacing on the Steel Substrate

Abstract:

Surfacing of Fe-Al alloy layer is achieved on the surface of Q235 steel plate by using the twin wire consisting of one aluminum welding wire and one steel welding wire in the shielding of pure argon. When the ER1100 aluminum welding wire of Φ1.6mm and ER50-6 steel welding wire of Φ1.2mm are selected as the master wire and slave wire respectively, with preheating and interlayer temperature reaching 350°C by controlling filling volume of aluminum and steel , the Fe-Al alloy layer featured by well-formed welding line is thus gained with no macroscopic defect. As the mechanical performance testing shows, the shear strength of surface combining surfacing layer and steel substrate is higher than 270MPa. The rupture position is located in surfacing layer and it turns out to be brittle fracture; the micro-hardness of surfacing layer ranges from 320HV to 420HV. Abrasion resistance testing indicates that abrasion resistance of surfacing layer is better than that of base material. According to micro-structure observation, the welding line is a coarsening columnar structure with a great deal of precipitated phase. According to EDAX, the aluminum content of precipitated phase in surfacing layer ranges from 24% to 32% (at), and the steel content ranging from 76% to 68% (at) - it is thus considered a Fe3Al structure through XRD.

• Periodical: Advanced Materials Research (Volume 658)
• Pages: 158-164
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.658.158
• Online since: January 2013
• Authors: Jin Yu, Yin Zhuo Huang, Bo Wen Wu, Hou Xian Zhou
• Keywords: Fe-Al Alloy, Mechanical Performance, Microscopic Stucture, Twin-Wire Surfacing

References

[1] Xu Binshi, Zhu Zixin, Liu Yan, Ma Shining, et al: Fe-Al intermetallics coating produced by high velocity arc spraying. The Chinese Journal of Nonferrous Metals (2004).

[2] Zhu Dongmei, Wang Xibao: Mcrostrueture of Fe3Al intermetallic compound produced by plasma cladding. Transactions of the China Welding Institution (2008).

[3] Cheng Guangping, He Yizhu: Preparation of deposited coating of Fe-Al inter metallic compound by laser cladding. Transactions of the China Welding Institution (2006).

[4] Yu Jin, Wu Bowen, et al: Microstructures and Properties of Copper-steel Welded Joint by Twin Wire Welding . Rare Metal Materials and Engineering (2011).

[5] Zhang Jianmin, Zhang Ruilin, Yu Ruihuang: Environmental embrittlement mechanism studies in department of Fe-Al intermetallic compounds . Science in China (1994).