The effect of thermal-aging on the microstructure and mechanical properties of 9Cr ferritic/martensitic ODS alloy

Zhang, Guangming; Zhou, Zhangjian; Mo, Kun; Miao, Yinbin; Xu, Shuai; Jia, Haodong; Liu, Xiang; Stubbins, James F.

doi:10.1016/j.jnucmat.2019.05.023

Title: The effect of thermal-aging on the microstructure and mechanical properties of 9Cr ferritic/martensitic ODS alloy

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Abstract

In this paper, the thermal-stability of 9Cr F/M ODS alloy was evaluated by the aging treatment in the air at 700 degrees C for 10 h, 100 h, 1000 h, and 2005 h. The variations of mechanical properties with different aging periods were tested in terms of tensile testing and vickers microhardness. And the microstructural evolution of strengthening particles and grain morphologies in the 9Cr F/M ODS alloys were characterized using field emission scanning electron microscopy, transmission electron microscopy and high-energy X-ray diffraction. It was found that the as-rolled 9Cr F/M ODS alloy slightly recovered without recrystallization during the initial stage of less than 10 h aging time, resulting in the slight loss of tensile strength and microhardness and the increase of elongation. With the aging time prolonged to 2005 h, several of nano-sized Y-Ti-O particles coarsened and the composition changed to Y-Ti-Al-O, and the number density of large size nitride precipitations increased and the composition also changed from TiN to (Ti,AI)N. Meanwhile, some of grains tend to grow up in some preferential directions due to the zener pinning effect by the localized uneven distributed particles inside the grains, causing more particles, especially the particles with a size of largermore »« less

Authors:

^[1]; Zhou, Zhangjian ^[2]; Mo, Kun ^[3];

^[3]; Xu, Shuai ^[2]; Jia, Haodong ^[2];

^[4];

^[4]

Qingdao Univ. of Technology, Qingdao (China). School of Mechanical and Automotive Engineering
Univ. of Science and Technology Beijing, Beijing (China). School of Materials Science and Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Chemical & Fuel Cycle Technologies Division
Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Nuclear, Plasma, and Radiological Engineering

Publication Date:: Thu Aug 15 00:00:00 EDT 2019

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: National Magnetic Confinement Fusion Science Program of China; USDOE

OSTI Identifier:: 1562668

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 522; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; mechanical properties; microstructure; thermal-aging

Citation Formats


                    Zhang, Guangming, Zhou, Zhangjian, Mo, Kun, Miao, Yinbin, Xu, Shuai, Jia, Haodong, Liu, Xiang, and Stubbins, James F. The effect of thermal-aging on the microstructure and mechanical properties of 9Cr ferritic/martensitic ODS alloy.  United States: N. p., 2019. 
Web.  doi:10.1016/j.jnucmat.2019.05.023.

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                    Zhang, Guangming, Zhou, Zhangjian, Mo, Kun, Miao, Yinbin, Xu, Shuai, Jia, Haodong, Liu, Xiang, & Stubbins, James F. The effect of thermal-aging on the microstructure and mechanical properties of 9Cr ferritic/martensitic ODS alloy.  United States.  https://doi.org/10.1016/j.jnucmat.2019.05.023

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                    Zhang, Guangming, Zhou, Zhangjian, Mo, Kun, Miao, Yinbin, Xu, Shuai, Jia, Haodong, Liu, Xiang, and Stubbins, James F. Thu .  
"The effect of thermal-aging on the microstructure and mechanical properties of 9Cr ferritic/martensitic ODS alloy".  United States.  https://doi.org/10.1016/j.jnucmat.2019.05.023.  https://www.osti.gov/servlets/purl/1562668.

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@article{osti_1562668,

  title        = {The effect of thermal-aging on the microstructure and mechanical properties of 9Cr ferritic/martensitic ODS alloy},

  author       = {Zhang, Guangming and Zhou, Zhangjian and Mo, Kun and Miao, Yinbin and Xu, Shuai and Jia, Haodong and Liu, Xiang and Stubbins, James F.},

  abstractNote = {In this paper, the thermal-stability of 9Cr F/M ODS alloy was evaluated by the aging treatment in the air at 700 degrees C for 10 h, 100 h, 1000 h, and 2005 h. The variations of mechanical properties with different aging periods were tested in terms of tensile testing and vickers microhardness. And the microstructural evolution of strengthening particles and grain morphologies in the 9Cr F/M ODS alloys were characterized using field emission scanning electron microscopy, transmission electron microscopy and high-energy X-ray diffraction. It was found that the as-rolled 9Cr F/M ODS alloy slightly recovered without recrystallization during the initial stage of less than 10 h aging time, resulting in the slight loss of tensile strength and microhardness and the increase of elongation. With the aging time prolonged to 2005 h, several of nano-sized Y-Ti-O particles coarsened and the composition changed to Y-Ti-Al-O, and the number density of large size nitride precipitations increased and the composition also changed from TiN to (Ti,AI)N. Meanwhile, some of grains tend to grow up in some preferential directions due to the zener pinning effect by the localized uneven distributed particles inside the grains, causing more particles, especially the particles with a size of larger than 40 nm, located at grain boundaries. These microstructural evolutions lead to the increasing of microhardness and a little bit decreasing of eleongation during 10 h-2005 h, and the increasing of tensile strength during 10 h-1000 h with the subsequent slight decreasing during 1000 h-2005 h. In conclusion, 9Cr F/M alloy shows a relatively good thermal-aging stability at 700 degrees C for 2005 h.},

  doi          = {10.1016/j.jnucmat.2019.05.023},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 522,

  place        = {United States},

  year         = {Thu Aug 15 00:00:00 EDT 2019},

  month        = {Thu Aug 15 00:00:00 EDT 2019}

}

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