600～1 000 ℃退火处理对FCC型CoxFeMnNi3-x合金组织演变及耐蚀性的影响

doi:10.11896/cldb.23080153

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Abstract Element Cr plays a critical role in the corrosion resistance of the CoCrFeMnNi alloy and stainless steel. However, there are few studies on microstructure evolution and corrosion resistance of the Cr-free Co-Fe-Mn-Ni alloys. In the present work, a series of Co_x FeMnNi_3-x alloys, with single FCC phase, were prepared by arc melting method and vacuum annealed at 600 ℃, 800 ℃, and 1 000 ℃ for 120 h, respectively. The microstructure evolution and corrosion resistance of these alloys at different states were investigated. The results show that all the as-cast Co_x-FeMnNi_3-x alloys are composed of dendrites structure, which developed with Co content. The corrosion resistance of the as-cast alloys decreases with the increase of Co content (the decrease of Ni). After 600 ℃ annealing, the alloy is still braided network dendrite. But the dendrite obviously weakens and begins to evolve to equiaxed grain. The grain boundary coarsened and the corrosion resistance reduced. The corrosion current density of 600 ℃ annealed Co_1.0FeMnNi_2.0 alloy (2.19×10^-6 A·cm^-2) becomes twice than that of the as-cast state. After 800 ℃ annealing, the Co_1.0FeMnNi_2.0 alloy is composed of many equiaxed grains, while the other alloys still contain some dendrites. The stable equiaxed grain improves the corrosion resistance of the alloy, and the corrosion current density decreases to 0.68×10^-6 A·cm^-2. When the annealing temperature increases to 1 000 ℃, the alloy is totally composed of coarse equiaxed grains, and the grains are closely bonded. The corrosion current density of 1 000 ℃ annealed Co_1.0FeMnNi_2.0 alloy decreases to 0.22×10^-6 A·cm^-2, which is better than that of 304L stainless steel.

Key words： arc melting annealing high entropy alloy microstructure corrosion resistance

Published: Online: 2024-10-12

CLC number:

TG113.12

Fund:This work was financially supported by the National Natural Science Foundation of China (52271005, 51771035),Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX23_1479).

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	WU Changjun
	ZHU Fucheng
	WANG Quan
	PENG Haoping
	LIU Ya
	SU Xuping

Cite this article:

WU Changjun,ZHU Fucheng,WANG Quan, et al. Effect of Annealing at 600—1 000 ℃ on Microstructure Evolution and Corrosion Resistance of the FCC-type Co_xFeMnNi_3-x Alloys[J]. Materials Reports, 2024, 38(18): 23080153-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23080153 OR http://www.mater-rep.com/EN/Y2024/V38/I18/23080153

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