STUDY ON MICROSTRUCTURE STABILITY OF A Y2O3 DISPERSION STRENGTHENED LOW-ACTIVATION STEEL

doi:10.11900/0412.1961.2014.00547

Acta Metall Sin

2015, Vol. 51

Issue (6): 641-650 DOI: 10.11900/0412.1961.2014.00547

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STUDY ON MICROSTRUCTURE STABILITY OF A Y₂O₃ DISPERSION STRENGTHENED LOW-ACTIVATION STEEL

Xue HU^1,²,Lixin HUANG³,Wei YAN¹,Wei WANG¹,Yiyin SHAN¹(

),Ke YANG¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 University of Chinese Academy of Sciences, Beijing 100049
3 State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004

Cite this article:

Xue HU, Lixin HUANG, Wei YAN, Wei WANG, Yiyin SHAN, Ke YANG. STUDY ON MICROSTRUCTURE STABILITY OF A Y₂O₃ DISPERSION STRENGTHENED LOW-ACTIVATION STEEL. Acta Metall Sin, 2015, 51(6): 641-650.

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Abstract

Oxide dispersion strengthened (ODS) steels are being developed as a promising structural material for next-generation nuclear energy systems, due to its excellent resistance to both irradiation damage and high-temperature creep. In this work, the mechanical alloying (MA) and hot isostatic pressing (HIP) technologies were used to prepare a ODS low-activation steel, based on the China low activation martensitic (CLAM) steel. SEM, XRD analysis and EPMA were used to examine the particle size, alloying element distribution and lattice distortion of the ball-milled powders. In order to obtain uniform powders, CLAM powders with 0.3%Y₂O₃ particles should be milled with hard steel balls of 6 mm in diameter for 50 h in Ar protective atmosphere, and the ball-to-powder weight ratio at 10∶1. The microstructure of well-prepared ODS-CLAM steel was stable till 1200 ℃ for 1 h, with grain size of 50~60 mm and martensitic lath width of 200 nm, meanwhile, the Y₂O₃ particles could still be found in the steel matrix.

Key words: oxide dispersion strengthened steel microstructure microstructure stability Y₂O₃

Fund: Supported by National Natural Science Foundation of China (No.51271175)

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	Xue HU
	Lixin HUANG
	Wei YAN
	Wei WANG
	Yiyin SHAN
	Ke YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00547 OR https://www.ams.org.cn/EN/Y2015/V51/I6/641

Table 1 Chemical compositions of CLAM steel and ODS-CLAM steel

Table 2 Tensile properties of CLAM steel and ODS-CLAM steel at room temperature (RT) and 600 ^oC

Fig.1 SEM images of the CLAM steel powders (a) and Y₂O₃ particles (b)

Fig.2 SEM images of the CLAM steel powders with addition of 0.3%Y₂O₃ ball-milled for 10 h (a), 20 h (b), 30 h (c), 40 h (d), 50 h (e) and 60 h (f)

Fig.3 Relationship of particle size of the ball-milled CLAM steel powders (D) and the ball milling time (t)

Fig.4 XRD spectra of the CLAM steel powders with addition of 0.3%Y₂O₃ after ball milling for different times

Fig.5 BSE image and EPMA element maps in large size particle after ball milling for 50 h

Table 3 Peak positions, half-widths of (110)_a_-(Fe,Cr) diffraction peaks, crystallite sizes and lattice strains of CLAM steel powders after ball milling for different times

Fig.6 OM images of the CLAM steel before (a) and after (b) solution treatment at 1200 ℃ for 60 min

Fig.7 OM images of the ODS-CLAM steel before (a) and after solution treated at 950 ℃ for 30 min (b), 1000 ℃ for 30 min (c) and 1200 ℃ for 60 min (d)

Fig.8 TEM images of the CLAM steel before (a) and after (b) solution treatment at 1200 ^oC for 60 min, and the SAED patterns (c, d) and EDS (e, f) of M₂₃C₆ carbide (c, e) and TaC (d, f) in the CLAM steel before solution treatment

Fig.9 TEM images of the ODS-CLAM steel before (a) and after (b, c) solution treatment at 1200 ^oC for 60 min

[1] Lindau R, M?slang A, Schirra M. Fusion Eng Des, 2002; 61-62: 659

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