Effect of Electric-Magnetic Compound Field on the Microstructure and Crack in Solidified Ni60 Alloy

doi:10.11900/0412.1961.2018.00134

Acta Metall Sin

2018, Vol. 54

Issue (10): 1442-1450 DOI: 10.11900/0412.1961.2018.00134

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Effect of Electric-Magnetic Compound Field on the Microstructure and Crack in Solidified Ni60 Alloy

Yinghua LIN^1,², Ying YUAN^1,², Liang WANG^1,², Yong HU^1,², Qunli ZHANG^1,², Jianhua YAO^1,²(

)

1 Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China
2 Zhejiang Provincial Collaborative Innovation Center of High-End Laser Manufacturing Equipment, Hangzhou 310014, China

Cite this article:

Yinghua LIN, Ying YUAN, Liang WANG, Yong HU, Qunli ZHANG, Jianhua YAO. Effect of Electric-Magnetic Compound Field on the Microstructure and Crack in Solidified Ni60 Alloy. Acta Metall Sin, 2018, 54(10): 1442-1450.

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Abstract

Ni60 alloy has been widely used in many application fields due to its excellent wear resistance, corrosion resistance and high temperature oxidation resistance. However, uneven microstructure was easily formed due to the effect of heat shock and heat accumulation during laser multi-track overlap process. Moreover, Ni60 alloy powder was composed of a variety of elements. The composition segregation and high content CrB, (Cr, Fe)₂₃C₆ were easily present in the coating during the laser cladding process, which can easily lead to the cracking of Ni60 alloy coating. In this work, multi-layer Ni60 alloy coating was prepared by electric-magnetic compound field assisted laser cladding. Synthesis of Ni60 alloy coating was analyzed by coloring agent, OM, SEM, EDS, XRD and microhardness tester. The results showed that cracks and large pores were to appear at the coating when the electric-magnetic compound field was not applied, and the molding quality was also poor. When the electric-magnetic compound field was applied, the surface cracks of Ni60 alloy coating were suppressed, the pores were eliminated, and the molding quality of the coating was also improved. Meanwhile, the particle size of the brittle phase (CrB, (Cr, Fe)₂₃C₆) was decreased from 4~6 μm to 2~4 μm by the aid of the electric-magnetic compound field, and the degree of particle cluster was also reduced, which was beneficial to the elimination of the internal crack. XRD, microstructure and microhardness analysis results showed that the brittle phase content, particle segregation, lattice distortion and hardness were reduced under the condition of electric-magnetic compound field, leading to the decrease of crack initiation probability, so the crack of Ni60 alloy coating was remarkably reduced.

Key words: Ni60 alloy laser cladding electric-magnetic compound field crack

Received: 11 April 2018

ZTFLH:	TN249
	TG156.99

Fund: Supported by National Key Research and Development Program of China (No.2017YFB1103601), National Natural Science Foundation of China (No.51475429) and China Postdoctoral Science Foundation (No.2017M610376)

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	Yinghua LIN
	Ying YUAN
	Liang WANG
	Yong HU
	Qunli ZHANG
	Jianhua YAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00134 OR https://www.ams.org.cn/EN/Y2018/V54/I10/1442

Fig.1 Schematic of laser cladding process with an electric-magnetic compound field (EMCF)

Fig.2 Surface dye inspection images of Ni60 alloy coatings without (a) and with (b) EMCF

Fig.3 Vertical section OM images of Ni60 alloy coatings without (a) and with (b) EMCF

Fig.4 Thicknesses of coatings at different positions without and with EMCF

Fig.5 XRD spectra of top layer (a) and bottom layer (b) of Ni60 alloy coatings without and with EMCF

Fig.6 Cross-sectional SEM images of Ni60 alloy coating without EMCF
(a) first pass (b) fifth pass

Fig.7 Low (a) and locally high (b) magnified SEM images of second pass of Ni60 alloy coating without EMCF

Table 1 EDS results of different positions marked in Figs.6 and 8 (atomic fraction / %)

Fig.8 Cross-sectional SEM images of Ni60 alloy coating with EMCF
(a) first pass (b) fifth pass

Fig.9 Microhardnesses of cross section of first pass Ni60 alloy coatings without and with EMCF

Fig.10 Schematics of phase segregation without EMCF
(a) melting stage
(b) monotectic early stage
(c) monotectic late stage
(d) eutectic reaction stage

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