The Effect of the Nitrogen Absorption on the TEM Structure of SUS304L Austenitic Stainless Steel Weld Metal

概要

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The effect of the nitrogen absorption on the transmission electron microscopic structure of SUS304L austenitic stainless steel weld me/it was investigated by varying the nitrogen partial pressure of the Ar-N_2 gas mixture welding atmosphere in an atmosphere-controlling chamber. An electron diffraction study suggested that the primary solidification mode of tie weld metal alters from ferritic mode to austenitic one depending on the nitrogen partial pressure and the nitrogen content of weld metal. The austenite frequently takes a near Kurdjumov-Sachs orientation relationship with the adjacent primary ferrite, while the eutectic ferrite does not take the K-S one with the adjacent austenite. The amount of the eutectic ferrite phase increases with the nitrogen partial pressure and the nitrogen content. In the weld metal with no ferrite, precipitation on dislocations and grain boundaries was observed.
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1986-04-01