Microstructure and Properties of Laser Cladding Layer on Ferritic Stainless Steel

doi:10.3901/JME.2016.12.037

Abstract

Abstract: Cladding coatings are fabricated on the surface of 0Cr13 ferritic stainless steel by laser cladding with no-carbon and low-carbon alloy powder respectively. The microstructure, phases and properties including micro-hardness, abrasive resistance and corrosion resistance of the cladding layers are investigated by optical microscope(OM), scanning electron microscopy(SEM), energy dispersive spectrometry (EDS), X-ray diffractometry(XRD), friction and wear tester and electrochemical workstation. The results show that these two kinds of alloy powder form good cladding layers without defects such as cracks and pores. The microstructures of the cladding layers mainly consist of equiaxed grain, cellular crystal, dentrite and interdendritic eutectic. The common phases of the two cladding layers are α-Fe、Fe-C、Cr、Cr_9.1Si_0.9、Fe_9.7Mo_0.3、Fe_10.8Ni and Fe₁₉Mn. Besides, interstitial compound phase Cr₇C₃ and martensite phase C_0.055Fe_1.945 are observed in the low-carbon cladding layer. The low-carbon cladding layer with a hardness of 750 HV_0.5 shows the highest wear resistance and electrolytic corrosion resistance in comparison with the 0Cr13 matrix with a hardness of 250 HV_0.5 and the no-carbon cladding layer with a hardness of 650 HV0.5. Softening occurred at the heat affect zone (HAZ) of no-carbon cladding layer. Both of the two cladding layers show a more stable frictional characteristic compared with matrix.

Key words: abrasive resistance, corrosion resistance, ferritic stainless steel, laser cladding, microstructure

CLC Number:

TG174

ZHANG Guodong, YANG Hui, WANG Qiyu, ZHANG Yazhi, LI Zhenggang, HUANG Xudong, LIAO Yunsheng. Microstructure and Properties of Laser Cladding Layer on Ferritic Stainless Steel[J]. Journal of Mechanical Engineering, 2016, 52(12): 37-45.

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