Characteristics for Solidification and Transformed Microstructure of Electroslag Weld Metal in Low Carbon Structural Steel(Materials, Metallurgy & Weldability)

概要

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The characteristics of solidification and transformed microstructures of electroslag (ES) weld metal have been studied in low carbon structural steel. The solidification modes are two classes: one is epitaxial cellular columnar growth in rim zone of weld metal , and other one is axial or stray cellular dendrite columnar growth in core zone. Transformed ferrite is classified by morphology into two types. Type 1 is proeutectoid ferrite which is composed of prior austenite boundary ferrite and intragranular polygonal ferrite. Type 2 is intragranular acicular ferrite. There was no difference in chemical composition between core and rim zone, but the volume fraction of proeutectoid ferrite is extremely different between core and rim zone. The effect of microstructure on impact toughness of ES weld metal is discussed. It is thought that the toughness of ES weld metal was depended on the amount of proeutectoid ferrite and notch direction.
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