Effect of Minor Ta- and Zr-alloying on High-temperature Microstructural Stability of Fe-Cr-Al-based Ferritic Stainless Steels

doi:10.11901/1005.3093.2016.695

Chinese Journal of Materials Research

2017, Vol. 31

Issue (5): 336-344 DOI: 10.11901/1005.3093.2016.695

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Effect of Minor Ta- and Zr-alloying on High-temperature Microstructural Stability of Fe-Cr-Al-based Ferritic Stainless Steels

Junzheng ZHANG¹, Donghui WEN¹, Beibei JIANG¹, Ruiqian ZHANG², Qing WANG¹(

), Chuang DONG¹

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 610041, China

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Junzheng ZHANG, Donghui WEN, Beibei JIANG, Ruiqian ZHANG, Qing WANG, Chuang DONG. Effect of Minor Ta- and Zr-alloying on High-temperature Microstructural Stability of Fe-Cr-Al-based Ferritic Stainless Steels. Chinese Journal of Materials Research, 2017, 31(5): 336-344.

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Abstract

The composition rule of the high-performance Fe-Cr-Al-Mo-Nb alloys was investigated in light of a cluster formula approach, and then a ternary cluster formula of Fe₇₅Al_9.375Cr_15.625 (at.%) was determined. Mo, Nb, Ta, and Zr were added into the alloy to partially substitute for partial Cr of Fe-Cr-Al-Mo-Nb alloys. Alloy ingots were prepared by vacuum arc melting, and then solution-treated at 1200oC for 2h before hot-rolled at 800oC into sheets. The alloy sheets samples were aged at 800oC for 24 hrs, followed by re-solution treatments at 1000oC, 1100oC and 1200oC for 1 h respectively. The microstructure and microstructural stability at high temperature of the alloy sheetssamples under various treatments were comparatively studied compared to study the HT microstructural stability of this series of alloys. The results show that the fine precipitates (Laves phase) distributed homogeneously in the ferritic matrix of the aged Mo/Nb/Ta/Zr alloy sheetsed samples. However, these particles begin to re-dissolve into the matrix after 1000oC/1 h solution treatment. Moreover, these particles disappeared in the Mo/Nb containing alloy after 1200oC/1 h solution, while Ta or Zr further minor-alloying could still ensure a certain amount of precipitates distributed on the grain boundaries, which effectively suppresses the abnormal growth of grains at high temperature. Therefore, the HT microstructural stability at high temperature and the resulted ant mechanical properties could be improved.

Key words: metallic materials Fe-Cr-Al-Mo-Nb/Ta/Zr alloys ferritic stainless steels alloying microstructural stability the second phase precipitation

Received: 28 November 2016

Fund: Supported by Foundation of Science and Technology on Reactor Fuel and Materials Laboratory of Nuclear Power Institute of China (No.ZX20150498), Natural Science Foundation of Liaoning Province of China (No.2015020202), International Science & Technology Cooperation Program of China (No.2015DFR60370), Fundamental Research Funds for the Central Universities (No.DUT16ZD212), and National Natural Science Foundation of China (No.U1610256)

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	Junzheng ZHANG
	Donghui WEN
	Beibei JIANG
	Ruiqian ZHANG
	Qing WANG
	Chuang DONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.695 OR https://www.cjmr.org/EN/Y2017/V31/I5/336

Table 1 Compositions of Mo/Nb/Ta/Zr alloyed Fe-Cr-Al serial alloys and their Vickers hardness HV under different treatments

Fig.1 XRD patterns of the Mo/Nb/Ta/Zr alloyed Fe-Cr-Al serial hot-rolled alloy plates after 800℃/24 h aging treatment

Fig.2 OM micrographs (a, c, e) and SEM electron back-scattering images (b,d,f) of the Mo/Nb/Ta/Zr alloyed Fe-Cr-Al serial hot-rolled alloy plates after 800℃/24 h aging treatment (a, b) No.1 with Mo/Nb, (c, d) No.2 with Mo/Nb/Ta, and (e, f) No.3 with Mo/Nb/Zr

Fig.3 SEM electron back-scattering micrographs of the aged Mo/Nb/Ta/Zr alloyed Fe-Cr-Al serial alloys after solution treatments at different temperature. 1: 1000℃/1 h, 2: 1100℃/1 h, and 3: 1200℃/1 h (a) No.1 with Mo/Nb, (b) No.2 with Mo/Nb/Ta, and (c) No.3 with Mo/Nb/Zr

Fig.4 OM micrographs of the aged Mo/Nb/Ta/Zr alloyed Fe-Cr-Al serial alloys after different solution treatments at different temperature. 1: 1000℃/1 h, 2: 1100℃/1 h, and 3: 1200℃/1 h (a) No.1 with Mo/Nb, (b) No.2 with Mo/Nb/Ta, and (c) No.3 with Mo/Nb/Zr

Fig.5 Elemental distributions of the aged Mo/Nb/Ta alloyed Fe-Cr-Al alloy after 1200℃/1 h by EPMA

Fig.6 Elemental distributions of the aged Mo/Nb/Zr alloyed Fe-Cr-Al alloy after 1200℃/1 h by EPMA

Fig.7 Vickers hardness HV of the Mo/Nb/Ta/Zr alloyed Fe-Cr-Al serial alloys under different treatments

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