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2019•Journal of Welding and JoiningOpen access

Nucleation Behavior of Acicular Ferrite in 1 GPa Class High Strength Steel Weld Metal

Yongjoon Kang, Changhee Lee

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Abstract

In this study, the nucleation behavior of acicular ferrite in 1 GPa class high strength steel weld metal was investigated.A 1 GPa class as-deposited weld metal specimen was prepared by single-pass welding using a prototype flux-cored wire, and a reheated weld metal specimen was obtained using Gleeble simulation technique.The typical inclusion in both specimens was composed of MnTi 2 O 4 and amorphous.It was found that the inclusion potency for acicular ferrite nucleation was maximized in the as-deposited weld metal because of both the formation of Mn-depleted zone (MDZ) near the MnTi 2 O 4 and the low interfacial energy between the MnTi 2 O 4 and ferrite.In the reheated weld metal specimen, it was observed that the inclusion potency decreased possibly due to the homogenization of Mn in the MDZ that occurred during reheating thermal cycling.

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In this study, the nucleation behavior of acicular ferrite in 1 GPa class high strength steel weld metal was investigated.A 1 GPa class as-deposited weld metal specimen was prepared by single-pass welding using a prototype flux-cored wire, and a reheated weld metal specimen was obtained using Gleeble simulation technique.The typical inclusion in both specimens was composed of MnTi 2 O 4 and amorphous.It was found that the inclusion potency for acicular ferrite nucleation was maximized in the as-deposited weld metal because of both the formation of Mn-depleted zone (MDZ) near the MnTi 2 O 4 and the low interfacial energy between the MnTi 2 O 4 and ferrite.In the reheated weld metal specimen, it was observed that the inclusion potency decreased possibly due to the homogenization of Mn in the MDZ that occurred during reheating thermal cycling.

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Available abstract

In this study, the nucleation behavior of acicular ferrite in 1 GPa class high strength steel weld metal was investigated.A 1 GPa class as-deposited weld metal specimen was prepared by single-pass welding using a prototype flux-cored wire, and a reheated weld metal specimen was obtained using Gleeble simulation technique.The typical inclusion in both specimens was composed of MnTi 2 O 4 and amorphous.It was found that the inclusion potency for acicular ferrite nucleation was maximized in the as-deposited weld metal because of both the formation of Mn-depleted zone (MDZ) near the MnTi 2 O 4 and the low interfacial energy between the MnTi 2 O 4 and ferrite.In the reheated weld metal specimen, it was observed that the inclusion potency decreased possibly due to the homogenization of Mn in the MDZ that occurred during reheating thermal cycling.

Key concepts: Acicular ferrite, Materials science, Nucleation, Metallurgy, Acicular, Welding, Ferrite (magnet), Metal

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