Impact Fracture Behavior of Duplex Stainless Steel Weldment(Materials, Metallurgy & Weldability, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)
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Weld simulation has been performed to improve the lowering of the toughness in the heat affected zone of super duplex stainless steel by increasing of austenite volume fraction. The cooling rate of the weld bond region was controlled by varying the cooling time from 1473K to 1073K (Δt_<12-8>. Austenite content was increased to as much as the base metal by using slow cooling rate (Δt_<12-8>=114s). However the toughness was not restored by the increase of austenite. The ferrite grain size also increased by using a slow cooling rate. The apparent size of ferrite grains was almost constant through the cooling rates by the austenite formed intragranularly. It is considered that the toughness of duplex stainless steel is influenced by austenite distribution.
- Transactions of JWRI
Transactions of JWRI 32 (1), 119-120, 2003-07