Effect of aging on microstructure and properties of laser remelted layer of Fe-based alloy

doi:10.13251/j.issn.0254-6051.2020.09.020

Abstract

Abstract: Microstructure and properties of thermal spraying welded layer and laser remelted layer with different aging treatment at 500 ℃ of an Fe-based alloy were compared and analyzed by using field emission scanning electron microscope(FE-SEM),transmission electron microscope(TEM),X-ray diffractometer(XRD) and electrochemical workstation.The results show that the microstructure of the thermal spraying welded layer after flame spraying is relatively coarse,which is markedly refined as composed of fine dendrites with lamellar eutectic evenly distributed in between after laser remelting.With the increase of aging time,columnar crystals closer to the eutectic structure in the remelting layer start to spheroidize,Cr₇C₃ and Cr₂₃C₆ carbides are further precipitated in the matrix and distribute in the lamellar eutectic structure between the dendrites.The hardness of the laser remelting layer aged for 6 h is the highest,as up to 507 HV0.5.With the aging time continues to increase,the hardness decreases,but it is still higher than that of the laser remelted layer without aging.After laser remelting,the corrosion resistance of the thermal spraying welded layer is significantly improved to the maximum,and that aged for 6 h is not significantly reduced,while that aged for 48 h is significantly reduced.

Key words: aging, Fe-based alloy, laser remelting, microstructure, properties

CLC Number:

TG156.92

Du Xiaojie, Hong Yongchang, Shan Junzhan. Effect of aging on microstructure and properties of laser remelted layer of Fe-based alloy[J]. Heat Treatment of Metals, 2020, 45(9): 111-115.

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