Microstructure and its influence on helium bubbles in nano-structured 9Cr-ODS steel

Chen Yang Lu; Zheng Lyu; Yun Peng Li; Chun Ming Liu

doi:10.3969/j.issn.1005-3026.2014.08.016

Microstructure and its influence on helium bubbles in nano-structured 9Cr-ODS steel

Chen Yang Lu
, Zheng Lyu
, Yun Peng Li
, Chun Ming Liu

School of Energy and Power Engineering

Northeastern University China

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

A 9Cr-ODS steel was prepared by mechanical alloying and hot isostatic pressing methods. The microstructures were characterized by high-resolution transmission electron microscopy and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Helium ions of 4×10¹⁷/cm² were respectively implanted into the 9Cr-ODS steel and non-ODS Eurofer97 steel with a 400 keV ion accelerator, and the sizes of helium bubbles in the two steels were observed by HAADF-STEM. The results show that the average grain size of the 9Cr-ODS steel is about 0.5 μm. Two kinds of precipitates were observed in the ODS steel: high-density nano-size Y₂Ti₂O₇ and large Mn(Ti)Cr₂O₄ formed mainly at the grain boundaries. The size of the helium bubbles in ODS steels is much more smaller than that in Eurofer97 steel, which means that the nano-size precipitates are helpful to suppress the formation of coarse helium bubbles.

Original language	English
Pages (from-to)	1133-1136
Number of pages	4
Journal	Dongbei Daxue Xuebao/Journal of Northeastern University
Volume	35
Issue number	8
DOIs	https://doi.org/10.3969/j.issn.1005-3026.2014.08.016
State	Published - 1 Aug 2014

Keywords

Helium ion implantation
Mn(Ti)CrO
ODS steel
Precipitate
Y-Ti-O

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10.3969/j.issn.1005-3026.2014.08.016

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title = "Microstructure and its influence on helium bubbles in nano-structured 9Cr-ODS steel",

abstract = "A 9Cr-ODS steel was prepared by mechanical alloying and hot isostatic pressing methods. The microstructures were characterized by high-resolution transmission electron microscopy and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Helium ions of 4×1017/cm2 were respectively implanted into the 9Cr-ODS steel and non-ODS Eurofer97 steel with a 400 keV ion accelerator, and the sizes of helium bubbles in the two steels were observed by HAADF-STEM. The results show that the average grain size of the 9Cr-ODS steel is about 0.5 μm. Two kinds of precipitates were observed in the ODS steel: high-density nano-size Y2Ti2O7 and large Mn(Ti)Cr2O4 formed mainly at the grain boundaries. The size of the helium bubbles in ODS steels is much more smaller than that in Eurofer97 steel, which means that the nano-size precipitates are helpful to suppress the formation of coarse helium bubbles.",

keywords = "Helium ion implantation, Mn(Ti)CrO, ODS steel, Precipitate, Y-Ti-O",

author = "Lu, \{Chen Yang\} and Zheng Lyu and Li, \{Yun Peng\} and Liu, \{Chun Ming\}",

year = "2014",

month = aug,

day = "1",

doi = "10.3969/j.issn.1005-3026.2014.08.016",

language = "英语",

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journal = "Dongbei Daxue Xuebao/Journal of Northeastern University",

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TY - JOUR

T1 - Microstructure and its influence on helium bubbles in nano-structured 9Cr-ODS steel

AU - Lu, Chen Yang

AU - Lyu, Zheng

AU - Li, Yun Peng

AU - Liu, Chun Ming

PY - 2014/8/1

Y1 - 2014/8/1

N2 - A 9Cr-ODS steel was prepared by mechanical alloying and hot isostatic pressing methods. The microstructures were characterized by high-resolution transmission electron microscopy and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Helium ions of 4×1017/cm2 were respectively implanted into the 9Cr-ODS steel and non-ODS Eurofer97 steel with a 400 keV ion accelerator, and the sizes of helium bubbles in the two steels were observed by HAADF-STEM. The results show that the average grain size of the 9Cr-ODS steel is about 0.5 μm. Two kinds of precipitates were observed in the ODS steel: high-density nano-size Y2Ti2O7 and large Mn(Ti)Cr2O4 formed mainly at the grain boundaries. The size of the helium bubbles in ODS steels is much more smaller than that in Eurofer97 steel, which means that the nano-size precipitates are helpful to suppress the formation of coarse helium bubbles.

AB - A 9Cr-ODS steel was prepared by mechanical alloying and hot isostatic pressing methods. The microstructures were characterized by high-resolution transmission electron microscopy and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Helium ions of 4×1017/cm2 were respectively implanted into the 9Cr-ODS steel and non-ODS Eurofer97 steel with a 400 keV ion accelerator, and the sizes of helium bubbles in the two steels were observed by HAADF-STEM. The results show that the average grain size of the 9Cr-ODS steel is about 0.5 μm. Two kinds of precipitates were observed in the ODS steel: high-density nano-size Y2Ti2O7 and large Mn(Ti)Cr2O4 formed mainly at the grain boundaries. The size of the helium bubbles in ODS steels is much more smaller than that in Eurofer97 steel, which means that the nano-size precipitates are helpful to suppress the formation of coarse helium bubbles.

KW - Helium ion implantation

KW - Mn(Ti)CrO

KW - ODS steel

KW - Precipitate

KW - Y-Ti-O

UR - https://www.scopus.com/pages/publications/84906840518

U2 - 10.3969/j.issn.1005-3026.2014.08.016

DO - 10.3969/j.issn.1005-3026.2014.08.016

M3 - 文章

AN - SCOPUS:84906840518

SN - 1005-3026

VL - 35

SP - 1133

EP - 1136

JO - Dongbei Daxue Xuebao/Journal of Northeastern University

JF - Dongbei Daxue Xuebao/Journal of Northeastern University

IS - 8

ER -

Microstructure and its influence on helium bubbles in nano-structured 9Cr-ODS steel

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Keywords

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