Microstructure and properties of 304/Q235 clad plate joints with high-entropy filler metals

doi:10.13251/j.issn.0254-6051.2022.08.010

Abstract

Abstract: The 304/Q235 clad plate was welded by using laser deposition welding. The microstructure, phase structure, mechanical properties and electrochemical corrosion resistance of the welded joints by using high-entropy filler metal of CrNi₂MnTi_0.5Al_0.5 and Fe-based filler metal, respectively, were compared and analyzed by means of optical microscope, scanning electron microscope, X-ray diffraction, material universal testing machine and electrochemical corrosion measurement system. The effect of filler metal on microstructure and properties of the stainless steel clad plate joints was explored. The results indicate that dual phase structure of FCC+Ti₃Al particles is formed in the weld zone with the CrNi₂MnTi_0.5Al_0.5 filer metals. Hardness value of the weld zone is only 69%-75% of that with the Fe-based filler metals. Two welded joints have good tensile strength, and both are fractured in the base metal. The weld zone with CrNi₂MnTi_0.5Al_0.5 filler metal has the best corrosion resistance, and its corrosion rate is 41% of the 304 stainless steel.

Key words: stainless steel clad plate, high-entropy filler metal, microstructure, mechanical properties, corrosion resistance

CLC Number:

TG441.2

Liu Dejia, Zha Xuean, Wang Weixiong, Tang Yanchuan, Zhao Longzhi, Xu Hongming. Microstructure and properties of 304/Q235 clad plate joints with high-entropy filler metals[J]. Heat Treatment of Metals, 2022, 47(8): 63-70.

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