SYNTHESIS OF LASER HIGH ENTROPY ALLOYING COATING ON THE SURFACE OF SINGLE-ELEMENT Fe BASE ALLOY

doi:10.3724/SP.J.1037.2014.00006

Acta Metall Sin

2014, Vol. 50

Issue (5): 555-560 DOI: 10.3724/SP.J.1037.2014.00006

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SYNTHESIS OF LASER HIGH ENTROPY ALLOYING COATING ON THE SURFACE OF SINGLE-ELEMENT Fe BASE ALLOY

ZHANG Song(

), WU Chenliang, WANG Chao, YI Junzhen, ZHANG Chunhua

Institute of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870

Cite this article:

ZHANG Song, WU Chenliang, WANG Chao, YI Junzhen, ZHANG Chunhua. SYNTHESIS OF LASER HIGH ENTROPY ALLOYING COATING ON THE SURFACE OF SINGLE-ELEMENT Fe BASE ALLOY. Acta Metall Sin, 2014, 50(5): 555-560.

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Abstract

FeCoCrAlCu laser high entropy alloying coating has been synthetized by high power semiconductor laser alloying of equimolar ratio of Co, Cr, Al, Cu four elements mixture powder on the surface of single-element Fe base alloy Q235 steel. The microstructure, constituent phases, composition distribution and mechanical properties of FeCoCrAlCu laser high entropy alloying coating were investigated by SEM, XRD, EDS and microhardness tester. Experimental results show that the principal element of Fe in the single-element base alloy Q235 substrate participates surface alloying process during the laser irradiation, forming FeCoCrAlCu five principal high entropy alloy coating. The alloying coating is composed of simple bcc solid solution and the microstructure is mainly composed of typical dendritic structure. Intermediate phase σ with tetragonal structure merely appears near the interface between laser alloying coating and substrate. From the surface of high entropy alloying coating to substrate, it presents the gradual distribution of the mixing entropy from high entropy, medium entropy to low entropy. the microhardness of FeCoCrAlCu laser high entropy alloying coating reaches 8.3 GPa, which is three times as much as that of the Q235 substrate.

Key words: single-element base alloy laser alloying FeCoCrAlCu high entropy alloy coating

Received: 06 January 2014

ZTFLH:

TG146.4

Fund: Supported by National Natural Science Foundation of China (No.51271126), Natural Science Foundation of Liaoning Province of China (No.2013020101) and Shenyang Science and Technology Funded Projects (Nos.F13-318-1-52 and F13-070-2-00)

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	Song ZHANG
	Chenliang WU
	Chao WANG
	Junzhen YI
	Chunhua ZHANG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2014.00006 OR https://www.ams.org.cn/EN/Y2014/V50/I5/555

Fig.1

CoCrAlCu/Q235激光高熵合金化层横截面SEM像

Fig.2

CoCrAlCu/Q235激光高熵合金化层中部局部微观组织

Table 1 EDS results of the compositions of the interdendritic (point A) and dendritic (point B) regions of the alloying coating in Fig.2(atomic fraction / %)

Fig.3

CoCrAlCu合金粉末的XRD谱

Fig.4

CoCrAlCu激光快速成型块体合金的XRD谱

Fig.5

CoCrAlCu/Q235激光高熵合金化层的XRD谱

Fig.6

CoCrAlCu/Q235激光高熵合金化层截面硬度分布曲线

Table 2 EDS results of the compositions of laser high entropy alloying sample of CoCrAlCu/Q235 at the surface of different depths(atomic fraction / %)

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