PRECIPITATION CHARACTERIZATION OF NiAl AND Cu-RICH PHASES IN DUAL-PHASE REGION OF PRECIPITATION STRENGTHENING STEEL

doi:10.11900/0412.1961.2014.00118

Acta Metall Sin

2014, Vol. 50

Issue (11): 1305-1310 DOI: 10.11900/0412.1961.2014.00118

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PRECIPITATION CHARACTERIZATION OF NiAl AND Cu-RICH PHASES IN DUAL-PHASE REGION OF PRECIPITATION STRENGTHENING STEEL

WANG Xiaojiao, SHEN Qin, YAN Jujie, QIU Tao, WANG Bo, LI Hui, LIU Wenqing(

)

Laboratory for Microstructures, Shanghai University, Shanghai 200444

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WANG Xiaojiao, SHEN Qin, YAN Jujie, QIU Tao, WANG Bo, LI Hui, LIU Wenqing. PRECIPITATION CHARACTERIZATION OF NiAl AND Cu-RICH PHASES IN DUAL-PHASE REGION OF PRECIPITATION STRENGTHENING STEEL. Acta Metall Sin, 2014, 50(11): 1305-1310.

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Abstract

Precipitation strengthening plays an important role on improving the mechanical properties of steels, NiAl and Cu-rich phases are two kinds of common precipitates. This work aims to reveal the precipitation characteristics of these two phases in martensite and retained austenite in precipitation strengthening steel by atom probe tomography (APT). The hot rolled samples were aged at 500 ℃ for 1 h after solution treatment at 900 ℃ for 2 h, followed by microstructure analysis. The results show that NiAl and Cu-rich phases form in martensite phase as well as at martensite/austenite phase boundaries, while no precipitate develops in retained austenite. Precipitation was not observed near the phase boundaries in martensite. Equivalent radius, spacing and concentration of the strengthening phases at phase boundary are larger than that inside martensite. In addition, NiAl phase tend to separate from Cu-rich phase, and the separated tendency becomes stronger at phase boundaries than in martensite. Besides, the growth of NiAl and Cu-rich phases at phase boundary differs from that within martensite, which should be induced by the defect density difference between them.

Key words: retained austenite martensite phase boundary strengthening phase atom probe tomography

Received: 20 August 2014

ZTFLH:

TG142.1

Fund: Joint Funds of the National Natural Science Foundation of China (No.U1460103)

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	Xiaojiao WANG
	Qin SHEN
	Jujie YAN
	Tao QIU
	Bo WANG
	Hui LI
	Wenqing LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00118 OR https://www.ams.org.cn/EN/Y2014/V50/I11/1305

Table 1 Chemical compositions of the precipitation-hardening steel

Fig.1 Three-dimensional APT maps of alloying elements C (a), Mn (b), Ni (c), Al (d) and Cu (e) after aging at 500 ℃ for 1 h (M—martensite, RA—retained austenite, PFZ—precipitate free zone)

Fig.2 One-dimensional concentrations along the arrows marked in Fig.1a (a) and Fig.1b (b)

Fig.3 Two types of precipitates obtained by using iso-surface methods (The green regions containing Cu isosurface at 5% (atomic fraction); the red regions containing Ni+Al isosurface at 20% with analyzed volume of 52 nm×52 nm×165 nm) (a) and enlarged figures of precipitates ppt1 (b), ppt2 (c), ppt3 (d) and ppt4 (e) (Each with an analyzed volume of 10 nm×10 nm×10 nm)

Table 2 Average concentrations of main alloying elements in NiAl-rich phases and Cu-rich phases

Fig.4 One-dimensional concentrations along the arrows marked in Figs.3b~e

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