STUDY ON σ PHASE PRECIPITATION OF HR3C STEEL USED IN ULTRA-SUPERCRITICAL BOILER

doi:10.11900/0412.1961.2015.00028

Acta Metall Sin

2015, Vol. 51

Issue (8): 920-924 DOI: 10.11900/0412.1961.2015.00028

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STUDY ON σ PHASE PRECIPITATION OF HR3C STEEL USED IN ULTRA-SUPERCRITICAL BOILER

Hui WANG,Congqian CHENG,Jie ZHAO(

),Zhi YANG

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023

Cite this article:

Hui WANG,Congqian CHENG,Jie ZHAO,Zhi YANG. STUDY ON σ PHASE PRECIPITATION OF HR3C STEEL USED IN ULTRA-SUPERCRITICAL BOILER. Acta Metall Sin, 2015, 51(8): 920-924.

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Abstract

HR3C steel is a new type of austenitic heat-resistant steel which has been widely used for super-heater and re-heater tubes in the ultra-supercritical (USC) boiler. The mechanical properties of HR3C steel were dependent on the stability of the microstructure, particularly the large amount of precipitates formed during service. The precipitation of s phase in HR3C steel during long-term aging for 2000 h at temperature of 700 and 750 ℃ was investigated by OM, SEM and TEM. The phase calculation method was applied to understand the factors influencing the precipitation. After 1000 h of the aging duration, irregular mass second phase was found to precipitate at the grain boundary, followed by the subsequent increasing and coarsening with time. The constituent elements of the phases were determined as Fe and Cr through SEM equipped with EDS. Further SAED analysis results led to the confirmation that these phases were basically s-FeCr compound. Combined with the prediction made through New PHACOMP method, the microstructure or phase structure in initial state may affect the subsequent precipitation behavior.

Key words: HR3C steel aging s phase phase computation microstructure

Fund: Supported by National Natural Science Foundation of China (Nos.51171037 and 51134013)

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	Hui WANG
	Congqian CHENG
	Jie ZHAO
	Zhi YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00028 OR https://www.ams.org.cn/EN/Y2015/V51/I8/920

Fig.1 OM images of microstructures for HR3C steel at different heat treatment states

(a) initial (b) 700 ℃, 1000 h (c) 700 ℃, 2000 h

(d) 750 ℃, 500 h (e) 750 ℃, 1000 h (f) 750 ℃, 2000 h

Fig.2 SEM image of HR3C steel after aging at 750 ℃ for 2000 h (a) and EDS analysis of large pieces precipitated phase at the grain boundary (b)

Fig.3 TEM image and SAED pattern (inset) of large size precipitated phase at grain boundary of HR3C steel after aging at 750 ℃ for 2000 h (a) and EDS analysis of the phase (b)

Fig.4 SEM image of microstructure of initial state HR3C steel (a) and EDS analysis of austenitic matrix (point 1) (b) and CrNbN phase (point 2) (c)

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