Solidification Crack Susceptibility in Weld Metals of Fully Austenitic Stainless Steels (Report VI) : Effect of La or REM Addition on Solidification Crack Resistance(MATERIALS METALLURGY AND WELDABILITY)

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A series of studies has been performed with the primary objective of producing crack-free, fully austenitic stainless steel weld metals. Previous papers indicated the reduction in P content in particular and S content below 0.005% each was one of the most beneficial means to reduce cracking susceptibility when the alloying elements were varied within the JIS composition range of SUS (AISI) 310S at present. Unfortunately it seems very difficult and costly to remove P by the conventional refining techniques. Therefore this investigation was undertaken to define an effective additive alloying element in promoting and improving the cracking resistance of SUS 310S containing a commercial level of P content. The qualitative effects of various alloying element additions on the solidification cracking resistance of SUS 310S with considerable levels of P and S content were preliminarily investigated by employing the Trans-Varestraint test. The result that a small amount of La was the most beneficial element in the composition range of fully austenitic microstructure was realized and subsequently was further confirmed with the cast-pin tear test and GTA (gas tungsten arc) bead-on-plate weld. Accordingly, commercially available SUS 310S plates to which La or partly REM (mish metal) was systematically added as an alloying element were made and subjected to the Trans-Varestraint test and other practical tests. It was revealed as a result that the optimum content of La or REM addition reduced cracking susceptibility to a large extent. The effects of La and REM additions were discussed in terms of the formation of sulphides and phosphides of high solidification temperature. This study resulted in the development of SUS 310S (25Cr-20Ni alloy) which exhibited excellent resistance to weld metal solidification cracking. In fact, for SUS 310S with the optimum levels of La or REM content it was proved with EB (electron beam) bead-on-plate welding that fully austenitic welds could be made which were free from horizontal cracks.
大阪大学の論文

Solidification Crack Susceptibility in Weld Metals of Fully Austenitic Stainless Steels (Report VI) : Effect of La or REM Addition on Solidification Crack Resistance(MATERIALS METALLURGY AND WELDABILITY)

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