Effect of nitrogen and nickel on the microstructure and mechanical properties of plasma welded UNS S32760 super-duplex stainless steels

2009 ◽  
Vol 44 (23) ◽  
pp. 6372-6383 ◽  
Author(s):  
K. Migiakis ◽  
G. D. Papadimitriou
Keyword(s):  
Mechanical Properties ◽  
Stainless Steels ◽  
Duplex Stainless Steels ◽  
Microstructure And Mechanical Properties ◽  
Super Duplex Stainless Steels

Effects of Heat Input Conditions on the Local Thermophysical Properties of Super Duplex Stainless Steels

2018 ◽  
Vol 930 ◽  
pp. 317-321
Author(s):  
José Adilson de Castro ◽  
Gláucio Soares da Fonseca ◽  
D.S.S. Almeida ◽  
L.C.R. Lopes ◽  
C.R. Xavier ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Mechanical Strength ◽  
Stainless Steels ◽  
Thermal History ◽  
Duplex Stainless Steels ◽  
Measured Temperature ◽  
Sem Images ◽  
Super Duplex Stainless Steels ◽  
Welding Procedure

The thermal properties of the super duplex stainless steels are strongly affected by the thermal history when welding procedure are applied leading to substantial changes on the mechanical properties of the welding region. The controlled dual phase microstructure (ferrite and austenite) guarantee excellent mechanical properties such as mechanical strength and corrosion resistance, in addition to small thermal expansion coefficient and high thermal conductivity. In this research a model able to predict the thermal history of the welding pieces coupled with local mechanical properties developed during welding procedure is developed. The model was verified by measured temperature profile and used to predict local properties such as grain size evolution, hardness and mechanical strength. An inverse method was implemented to obtain the parameters fitting for the grain growth evolution, hardness and yielding strength compatible with the final microstructure and grain size measured using SEM images and stereological techniques.

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