Abstract
Sulphides formed in TIG-arc weld metals of Fe-S-Mn ternary alloys and the solidification, crack susceptibility have been investigated. At the same time the applicability of the law of coincidence for change in liquid compositions during non-equilibrium solidification has been examined. Main conclusions obtained are as follows:1) The shape and structure of sulphides and the crack susceptibility of weld metal can be classified by Mn3/S ratio which was expected by the law of coincidence.2) In the weld metal whose Mn3/S is less than about 0.83, sulphide is composed of FeS and (Mn, Fe)S. Its shape is filmlike at the columnar grain boundary and globular at the cell or cellular dendrite boundary. Moreover solidification crack always occurs along the filmilike sulphide.3) In the weld metal whose Mn3/S is bteween 0.83 and about 3, only (Mn, Fe)S is generally formed, whose shape at the columnar grain boundary is still filmlike. Solidification crack also occurs along the filmlike sulphide in high welding speed.4) In the weld metal whose Mn3/S is more than about 3, obvious eutectic composed of iron and small (Mn, Fe)S of granular shape is formed at both the columnar grain boundary and the cell or cellular dendrite boundary. In this weld metal solidification crack does not occur.
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