Effect of Mo/Nb/Ti/Zr Minor-alloying on the Second-phase Precipitation and Microhardness in Fe-Cl-Al Stainless Steels

doi:10.11901/1005.3093.2017.675

Chinese Journal of Materials Research

2018, Vol. 32

Issue (8): 575-583 DOI: 10.11901/1005.3093.2017.675

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Effect of Mo/Nb/Ti/Zr Minor-alloying on the Second-phase Precipitation and Microhardness in Fe-Cl-Al Stainless Steels

Zhenhua WANG¹, Donghui WEN¹, Yang LV¹, Jiamiao HAO¹, Qing WANG¹(

), Yu XU²

1 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education) & School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2 Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China

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Zhenhua WANG, Donghui WEN, Yang LV, Jiamiao HAO, Qing WANG, Yu XU. Effect of Mo/Nb/Ti/Zr Minor-alloying on the Second-phase Precipitation and Microhardness in Fe-Cl-Al Stainless Steels. Chinese Journal of Materials Research, 2018, 32(8): 575-583.

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Abstract

The effect of the minor addition of Mo, Nb, Ti, and Zr on the second-phase precipitation and microhardness of Fe-Cr-Al serial alloys were investigated. Ternary composition of [Al-(Fe₁₂Cr₂)](Al_0.5Cr_0.5) was first determined by the cluster formula approach, based on which a minor amount of alloying elements was added to form new alloys. Alloy ingots were prepared by vacuum arc melting, then solid-solution treated at 1200℃ for 2 h, and finally hot-rolled at 800℃ into plates. The plates were further aged at 800℃ for 24 h. The designed alloys were characterized by means of XRD analysis, OM , SEM and microhardness tester. Results showed that both the type and quantity of minor-alloying elements affect the second-phase precipitation. Specifically, when the atomic ratio of Mo:Nb=2:1 the second-phase particles presented as fine precipitates and distributed uniformly in the ferritic matrix, which results in the higher hardness of about 250 HV. While the addition of Ti decreases the volume fraction of precipitated particles in Mo/Nb/Ti-modified alloy obviously, in which the particle size is increased slightly, corresponding to the lower microhardness about 240 HV. The addition of Zr accelerates the segregation of precipitates and coarsens the particle size, but the Mo/Nb/Ti/Zr-modified alloy still showed a relatively-higher microhardness (about 246 HV).

Key words: metallic materials ferritic stainless steels Fe-Cr-Al-based alloys micro-alloying second-phase precipitation

Received: 16 November 2017

ZTFLH:

TG142

Fund: Supported by Foundation of Science and Technology on Reactor Fuel and Materials Laboratory of Nuclear Power Institute of China (No. ZX20150498);National Key Research and Development Plans (No. 2017YFB0702400);International Thermonuclear Experimental Reactor Program of China (No. 2015GB121004);International Science & Technology Cooperation Program of China (No. 2015DFR60370);State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials of Guangxi University (No. GXKFJ16-11)

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	Zhenhua WANG
	Donghui WEN
	Yang LV
	Jiamiao HAO
	Qing WANG
	Yu XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.675 OR https://www.cjmr.org/EN/Y2018/V32/I8/575

Table 1 Compositions of Fe-Cr-Al-M (M=Mo, Nb, Ti, Zr) alloys, including cluster formula, atomic percent (atomic fraction, %) and weight percent (mass fraction, %)

Fig.1 CN14 rhombic-dodecahedron cluster in BCC structure, in which the yellow sphere represents the cluster center, and the cluster shell is constituted of eight blue spheres on the 1st-neighbor and six green spheres on the 2nd-neighbor

Fig.2 XRD patterns of the Mo/Nb/Ti/Zr-alloyed Fe-Cr-Al alloys after solid solution (a) and OM micrographs of the Mo/Nb-alloyed alloy (No.1) after solid solution (b) and hot-rolling (c)

Fig.3 SEM back-scattering images of the Mo/Nb/Ti/Zr alloyed Fe-Cr-Al serial alloys after hot-rolling (a): No. 1, (b): No. 2, (c): No. 3, (d): No. 4, and (e): No. 5

Fig.4 XRD patterns of the Mo/Nb/Ti/Zr-alloyed Fe-Cr-Al alloys after 800℃/24 h aging

Fig.5 OM micrographs and SEM back-scattering images of the Mo/Nb/Ti/Zr-alloyed Fe-Cr-Al serial alloys after 800℃/24 h aging (a): No.1, (b): No.2, (c): No.3, (d): No.4, and (e): No.5

Table 2 Composition (%, atomic fraction) of the Mo/Nb/Ti/Zr-alloyed Fe-Cr-Al serial alloys after 800℃/24 h aging measured by SEM-EDS

Fig.6 Volume fractions of the second phase particles of the aged Mo/Nb/Ti/Zr-alloyed Fe-Cr-Al alloys

Fig.7 Microhardness HV of Mo/Nb/Ti/Zr alloyed Fe-Cr-Al serial alloys under hot-rolling and aging states

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