Crack sensitivity and formation mechanism of laser clad H13 steel

doi:10.13251/j.issn.0254-6051.2020.06.043

Abstract

Abstract: A multitrack overlapping clad layer was fabricated on H13 steel substrate by laser cladding with coaxial powder feeding, the microstructure characteristics were studied by means of optical microscope (OM), SEM and XRD. The clad layer cracks were detected by penetrant inspection method, and the crack density was quantitatively characterized by image processing. The effects of the laser cladding process parameters on crack sensitivity were studied, and the mechanism of crack formation was analyzed. The results show that the microstructure of H13 steel clad layer is mainly composed of martensite and residual austenite transformed from dendrite-like austenite. The crack sensitivity of the clad layer is high, most of them are thermal cracks, which initiates and propagates between austenite columnar dendrites. The laser power has a significant impact on the crack sensitivity of the clad layer, the higher the power, the lower the crack sensitivity, and the clad layer without cracks can be obtained by optimizing process parameters.

Key words: laser cladding, H13 steel, crack, microstructure

CLC Number:

TG174.44

Yang Wei, Zeng Daxin, Liu Jianyong, Li Fengguang. Crack sensitivity and formation mechanism of laser clad H13 steel[J]. Heat Treatment of Metals, 2020, 45(6): 206-211.

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