Effect of heat treatment on the microstructure and mechanical properties of wire arc additively manufactured ferrite/martensitic steel for nuclear applications

ZHOU Yaju; YIN Shengming; XIA Yongzhong; YI Guoqiang; XUE Lihong; YAN Youwei

doi:10.12073/j.hjxb.20221011001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(10): 18-26. > DOI: 10.12073/j.hjxb.20221011001

ZHOU Yaju, YIN Shengming, XIA Yongzhong, YI Guoqiang, XUE Lihong, YAN Youwei. Effect of heat treatment on the microstructure and mechanical properties of wire arc additively manufactured ferrite/martensitic steel for nuclear applications[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(10): 18-26. DOI: 10.12073/j.hjxb.20221011001

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Effect of heat treatment on the microstructure and mechanical properties of wire arc additively manufactured ferrite/martensitic steel for nuclear applications

1.
State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
2.
Huazhong University of Science and Technology, Wuhan, 430074, China

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Received Date: October 10, 2022
Available Online: September 11, 2023

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Abstract

Abstract

Reduced activation ferritic/martensitic (RAFM) steel was fabricated by wire and arc additive manufacturing (WAAM) technology. The microstructural evolution was observed by optical microscope, scanning electron microscope and transmission electron microscope and the mechanical properties were tested by a tensile tester to study the effect of heat treatment on the microstructure and mechanical properties of WAAM RAFM steel. The results showed that the microstructure of as-built RAFM steel consisted of dual phases of ferrite and tempered martensite and the average grain size was about 1.51 μm. After heat treatment, the RAFM steel showed no significant increase in grain size (1.84 μm), and high-density dislocations were retained in the microstructure. In addition, a large number of TiO₂ secondary phase nanoparticles, with the grain size of 5 − 10 nm, have precipitated and dispersed in the matrix after the heat treatment. The tensile strength of WAAM RAFM steel was significantly improved after heat treatment while the elongation after fracture was slightly reduced. The tensile strength of RAFM steel after heat treatment was 1080 MPa at room temperature and even at a temperature of 650 ℃, it can still reach about 285 MPa.
- wire and arc additive manufacturing,
- reduced activation ferritic/martensitic steel,
- heat treatment,
- microstructure

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References (23)

References

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Effect of heat treatment on the microstructure and mechanical properties of wire arc additively manufactured ferrite/martensitic steel for nuclear applications