EFFECT OF δ-FERRITE ON THE COMPOSITION AND VOLUME FRACTION OF PRECIPITATES IN P92 STEEL AGED AT 700 AND 750℃

doi:10.3724/SP.J.1037.2012.00086

Acta Metall Sin

2012, Vol. 48

Issue (11): 1315-1320 DOI: 10.3724/SP.J.1037.2012.00086

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EFFECT OF δ-FERRITE ON THE COMPOSITION AND VOLUME FRACTION OF PRECIPITATES IN P92 STEEL AGED AT 700 AND 750℃

PENG Zhifang¹⁾, CAI Lisheng¹⁾, PENG Fangfang²⁾, DANG Yingying¹⁾, CHEN Fangyu³⁾

1) School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072
2) Materials Research Department, Dong Fang Boiler Group Corp. Ltd., Zigong 643001
3) Research Institute of Wuhan Iron and Steel Company Ltd., Wuhan 430080

Cite this article:

PENG Zhifang CAI Lisheng PENG Fangfang DANG Yingying CHEN Fangyu. EFFECT OF δ-FERRITE ON THE COMPOSITION AND VOLUME FRACTION OF PRECIPITATES IN P92 STEEL AGED AT 700 AND 750℃. Acta Metall Sin, 2012, 48(11): 1315-1320.

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Abstract

Using the as-received P92 steel pipe steel samples with/without δ-ferrite as objects and EPMA-EDS+MPST (multiphase separation technique), this work investigated the effects of δ-ferrite on the volume fraction and< composition of M₂₃C₆ and Laves phases precipitated in the ageing treatment at 700 and 750℃ for 1000, 3000 and 5000 h, respectively. The results are as follows. The existence of δ-ferrite promoted aggregation and coarsening of M₂₃C₆ and Laves particles precipitated along boundaries with its neighboring lath martensite at the expense of consuming Cr, Mo and W in δ-ferrite during the ageing treatments. Varying rate of the volume fraction of M₂₃C₆ with the ageing time for the samples without δ-ferrite would chang at different ageing temperatures, and also the volume fraction of Laves phase would increase with decreasing ageing temperature for the samples with δ-ferrite. Owing to a few amount of Laves formed at higher temperature, the volume fraction of M₂₃C₆ increased in the samples with δ-ferrite. And increasing ageing temperature and time stimulated the coarsening of particles precipitated in the pipe samples investigated. It is expected that the related information from this study on the effects of existence of δ-ferrite on the microstructural stability and high temperature properties of P92 can be used as a reference when needed.

Key words: P92 steel δ-ferrite M₂₃C₆ Laves

Received: 22 February 2012

Fund:

Supported by National Natural Science Foundation of China (No.50674072) and Scientific Research Project of Dong Fang Boiler Group Corp. Ltd., 2009-2011

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00086 OR https://www.ams.org.cn/EN/Y2012/V48/I11/1315

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