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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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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)
Corresponding Authors:  Correspondent: LIU Wenqing, professor, Tel: (021)66135027, E-mail:wqliu@staff.shu.edu.cn   

Cite this article: 

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

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