Influence of Ti on the Microstructure and Performance of Fe-Cr Alloy Cladding Layer

Abstract:

Considering the multi-porous and rimous Fe-Cr series alloy coatings deposited on Q235 steel by plasma arc welding, the mass fraction of 0%, 2%, 4%, 6%, 8% Ti is mixed into Fe-Cr alloy powder. The microstructure and characteristics of the Fe-Cr series alloys with a range content of Ti were investigated using optical micrograph (OM), X-ray diffraction (XRD), scanning electron micrograph (SEM) Digital Micro-hardness Tester and M-2000 dry abrasion tester. The major phase of the Fe-Cr layers is dendrite with the lath carbide mixed between the limb of dendrite and the grains refine with addition of Ti. The XRD result indicates the main phases are (Fe-Cr) solution, Cr₂₃C₆, and TiC, while the result of Digital Micro-hardness test shows the microhardness increases with the mass fraction of Ti till it comes to 4% and decreases with the following addition of Ti. The highest average hardness of layer is 750HV with content of 4% Ti, while the coating with 2% Ti appears better wear resistance with the least wear volume for the match of toughness matrix and hard phase. Hence, the coating with 2% to 4% Ti shows the best property.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 709-715
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.709
• Online since: March 2016
• Authors: Jian Yang Liu, Qing Tao*, Wei Lai, Wei Wei Tang, Jian Wang, Wei Liu
• Keywords: Iron-Based Powder, Plasma Arc Welding, TiC, Wear Character

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