Effect of Ni Content on Microstructure, Mechanical Properties and Corrosion Behavior of Weathering Steel Weld Metal for High-speed Train Bogies

doi:10.3901/JME.2024.18.163

Abstract

Abstract: It has become a challenge for the development of high-speed trains to obtain high toughness and high weather resistance weld metal for bogies by adjusting alloying elements. However, the influence of Ni has not been fully studied. Based on this, the relationship between nickel content, microstructure, mechanical properties and corrosion behavior of weld metal with Ni-Cr-Cu alloy system for high-speed train bogies is studied. The results of optical and scanning electron microscopy show that the increase of Ni content from 0.35% to 0.85% result in the increase of acicular ferrite proportion (about 10% to 14%), the decrease of M-A constituent (1.9% to 0.6% in the welded zone, 1.3% to 0.7% in the reheated zone), the decrease of the size for M-A constituent in the welded zone, and the refinement of equiaxed ferrite in the reheated zone. The impact test results indicate that with the rise of Ni content from 0.35% to 0.85%, the impact energy of the weld metal at -40℃ and -60℃ is improved by 45 J and 40 J respectively, through enhancing the toughness of ferrite matrix, increasing the proportion of AF, reducing the M-A constituent and refining microstructures. Cycle immersion corrosion test and electrochemical test show that the increase of Ni content promote the densification of the inner and outer rust layer, and thus improve the corrosion resistance of the weld metal. The influence mechanism and internal relation of Ni content on the microstructure and properties of weld metal are revealed, which provide technical support for the composition control of weld metal for high-speed train bogies operating in harsh service environment.

Key words: high speed train, weathering steel, microstructure, corrosion resistance, toughness, Ni

CLC Number:

TG156

WANG Gaojian, LIU Li, KANG Dandan, YE Yanhong, DENG Dean. Effect of Ni Content on Microstructure, Mechanical Properties and Corrosion Behavior of Weathering Steel Weld Metal for High-speed Train Bogies[J]. Journal of Mechanical Engineering, 2024, 60(18): 163-172.

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