Study on grain growth behavior of acicular ferrite in weld deposited metal

SONG Fengyu; ZHOU Laihong; LUN Wenshan; HUANG Zengyang; BO Xiangyang

doi:10.12073/j.hjxb.20200929003

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2021 > 42(5): 23-28. > DOI: 10.12073/j.hjxb.20200929003

SONG Fengyu, ZHOU Laihong, LUN Wenshan, HUANG Zengyang, BO Xiangyang. Study on grain growth behavior of acicular ferrite in weld deposited metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(5): 23-28. DOI: 10.12073/j.hjxb.20200929003

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Study on grain growth behavior of acicular ferrite in weld deposited metal

1.
Longyan University, Longyan, 364012, China
2.
Xinyu University, Xinyu, 338004, China
3.
Shandong Heng Yuan Weapon Technology CORP., LTD, Taian, 271000, China
4.
Quzhou Quality and Technical Supervision and Testing Center, Quzhou, 324000, China
5.
Institute for Experimental Molecular Imaging, RWTH Aachen University, Aachen, 52074, Germany

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Received Date: September 28, 2020
Available Online: July 04, 2021

Graphical Abstract

Abstract

Abstract

In this study, having acicular ferrite (AF) as the matrix the high heat input weld metal was taken as the research object and acicular ferrite (AF) grain orientation relationships (ORs) in the deposited metal was identified from Metallographic microscope (OM), electron bacK-Scatter diffraction device (EBSD), automatic static phase change instrument, etc, the influence of different heat input on the growth behavior of AF grain in the weld metal was analyzed. The results showed that, When the cooling rate of the weld metal is below the critical rate, AF in the weld metal nucleated from the inclusions with polygonal ferrite morphology, and deviated from K-S OR with respect to parent phase γ. When the temperature of the deposited metal decreased to the transformation start temperature, AF grew up with slender needle morphology, and exhibited K-S OR with respect to parent phase γ. However, with the decrease of the welding heat input, AF nuclear size reduced, and the approach to K-S OR with respect to parent phase γ was accelerated, when the cooling rate of the weld metal exceeds the critical rate, AF grains can grow rapidly without nucleation.
- high heat input,
- weld metal,
- acicular ferrite,
- grain orientation

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References (13)

References

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Study on grain growth behavior of acicular ferrite in weld deposited metal