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자료유형
학술대회자료
저자정보
저널정보
대한용접·접합학회 대한용접학회 특별강연 및 학술발표대회 개요집 대한용접학회 2008년도 추계 학술발표대회 개요집 제50권
발행연도
2008.11
수록면
63 - 66 (4page)

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Microstructures of steel weld metals consist of various constituents such as grain boundary ferrite (GB), ferrite sideplate (FS), acicular ferrite (AF) resulting in complex structure. Unlike other phases, AF forms within the prior austenite grains. It is generally accepted that the presence of nonmetallic inclusions of an appropriate size and composition promote the formation AF through heterogeneous nucleation. The heterogeneous nucleation of AF on inclusions has been the subject of numerous studies. but the nucleation mechanisms of AF on non-metallic inclusions have been put forward, for example, (1) Inert Substrate, (2) Chemical depletion or enrichment, (3) Lattice Matching (4) Thermal Strain Energy.
1. Inert Substrate: Using the classical nucleation theory, the efficiency of inclusions as substrates for nucleation has been examined. According to this mechanism, larger inclusion has higher probability of AF nucleation irrespective of inclusion chemistry. However, there are various inclusion chemistries that are not effective for AF nucleation
2. Chemical depletion or enrichment: This mechanism suggests that Chemical element depleted or enriched zone of the austenite matrix adjacent to inclusions increases the thermodynamic driving force of phase transformation around inclusions. Mn-depleted zone formed around the inclusion has been documented by many researchers in steels but not in weld metal.
3. Lattice Matching: Good lattice matching between the ferrite and the inclusion surface reduces the interfacial energy for ferrite transformation resulting in epitaxial growth of ferrite. There are some evidences showing crystallographic orientation relationship between inclusion and ferrite.
4. Thermal Strain Energy: Difference in thermal expansion coefficient between the inclusion and the austenite matrix can cause strain energy that may increase the driving force for transformation.
Above mechanisms have been proposed to explain AF nucleation assisted by inclusions, several evidences showing that inert substrate and thermal strain energy alone is insufficient to explain the relative potency of inclusions. While the inert substrate mechanism was the fist mechanism suggested, but there has been a lot of evidences for lattice matching mechanism and there is increasing evidences for chemical depletion.

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Abstracts
1. 서론
2. 비금속개재물의 역할
3. 고찰
4. 결론

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