TEM CHARACTERIZATION OF DISPERSOIDS AND MICROSTRUCTURE OF ODS-316 AUSTENITIC STEEL

WANG Man; ZHOU Zhangjian; YAN Zhigang; YU Pengfei; SUN Hongying

doi:10.3724/SP.J.1037.2012.00466

Acta Metall Sin >

2013 , Vol. 49 >Issue 2: 153 - 158

DOI: https://doi.org/10.3724/SP.J.1037.2012.00466

TEM CHARACTERIZATION OF DISPERSOIDS AND MICROSTRUCTURE OF ODS-316 AUSTENITIC STEEL

WANG Man ,
ZHOU Zhangjian ,
YAN Zhigang ,
YU Pengfei ,
SUN Hongying

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1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2) State Key Laboratory for Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004

Received date: 2012-08-04

Revised date: 2012-12-04

Online published: 2013-02-11

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Abstract

Super-critical water-cooled reactor (SCWR) has been selected to be one of the most potential advanced nuclear reactors due to its simplification and high efficiency. Oxide dispersion strengthened (ODS) austenitic steels are promising candidate materials for SCWR, which combine the advantages of both austenitic stainless steels and ODS steels. In this work, ODS-316 austenitic steel (316L+0.35%Y₂O₃+0.3%Ti, mass fraction) was fabricated by the process of mechanical alloying (MA) and hot isostatic pressing (HIP). The microstructural evolution after milling and hipping were studied by XRD. Morphologies and electron diffraction patterns of dispersed particles were characterized by TEM. Tensile properties of ODS austenitic steel were measured at room temperature. It was found that there were two phases of α (FeCr) and γ (Fe, Ni) in the powders after mechanical alloying, which was resulted from strain induced transformation. ODS-316 austenitic steel was single austenitic phase, since the strain disappeared during the consolidation of HIP. According to the observation and characterization of TEM, three kinds of dispersoids were found in samples: cubic Y₂Ti₂O₇ and TiN and orthorhombic Y₂TiO₅. However, most of the dispersoids were round particles that enriched in Y, Ti and O. The tensile strength of ODS-316 austenitic steel was improved significantly, and its UTS reached 726 MPa.

Key words： mechanical alloying; ODS austenitic steel; dispersed particle

Cite this article

WANG Man , ZHOU Zhangjian , YAN Zhigang , YU Pengfei , SUN Hongying . TEM CHARACTERIZATION OF DISPERSOIDS AND MICROSTRUCTURE OF ODS-316 AUSTENITIC STEEL[J]. Acta Metall Sin, 2013 , 49(2) : 153 -158 . DOI: 10.3724/SP.J.1037.2012.00466

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