Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 2002-2009.doi: 10.13229/j.cnki.jdxbgxb20180429

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Preparation and property of Cr alloying layer on TC4 after surface alloying induced by high current pulsed electron beam

Qing-feng GUAN1(),Xin-wen YAO1,Yang YANG1,Ling-yan ZHANG2,Di LIU1,Chen LI1,Peng LYU1()   

  1. 1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
    2. School of Science, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2018-05-03 Online:2019-11-01 Published:2019-11-08
  • Contact: Peng LYU E-mail:guanqf@ujs.edu.cn;lvp@mail.ujs.edu.cn

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Abstract:

To improve the surface properties of the TC4 titanium alloy, Cr alloying layers are formed on the TC4 samples' surfaces using high-current pulsed electron beam (HCPEB). The microstructure and phase analysis of the surface alloying layer were studied by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results demonstrate that after HCPEB alloying, Cr alloyed layer about 1.5μm in thickness is formed on the surface. The diffusion of Cr element occurred on the surface of the substrate, the Ti atoms combined with the chromium to form tiny Laves phase Cr2Ti. Martensitic transformation occurred in the irradiated layer and a large number of lath martensite structures were observed in the irradiated surface. Moreover, both the surface microhardness and corrosion resistance of the HCPEB treated samples were obviously improved.

Key words: materials synthesis and processing technology, high current pulsed electron beam, TC4 titanium alloy, Cr-alloyed layer, corrosion resistance

CLC Number: 

  • TG174.445

Fig.1

The XRD analysis of alloyed sample before and after HCPEB irradiation"

Fig.2

OM images of TC4 titanium alloy beforeand after HCPEB alloying"

Fig.3

Cross-sectional SEM images of Cr alloying layer"

Fig.4

TEM images of sample alloyed by 20 pulses"

Fig.5

TEM images of sample alloyed by 30 pulses"

Fig.6

Micro-hardness of the alloyed sample"

Fig.7

Polarization curves of the alloyed samples"

Table 1

Corrosion data of the alloyed and unalloyed TC4 samples"

试样 E corr/V I corr/(μA·cm-2)
未处理 -0.873 2.786
10次辐照 -0.623 0.821
20次辐照 -0.605 0.722
30次辐照 -0.381 0.643

Fig.8

Corrosion morphologies of specimens beforeand after HCPEB treatment"

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