Impact-toughness investigations of duplex stainless steels

Abstract

Duplex stainless steels are very attractive constructional materials for use in aggressive environments because of their several advantages over austenitic stainless steels. Duplex steels have excellent pitting and crevice corrosion resistance, are highly resistant to chloride stress-corrosion cracking and are about twice as strong as common austenitic steels. Better properties are associated with their microstructures consisting of ferrite and austenite grains. However, with certain thermal treatments, these excellent properties may be reduced due to undesired changes in the steel microstructure, related mainly to different solid-state-precipitation processes. The impact toughness of the commercial 2205 duplex stainless steel and the higher-alloy super-duplex 2507 steel was investigated. Both steels were submitted to the ageing treatment in a temperature range between 500°C and 900°C with the exposure times of 6 min, 1 h and 10 h; in addition, light microscope examinations, hardness measurements and impact-toughness tests were performed. The main objective of the investigations was to determine the effect of the change in the microstructure on the mechanical properties of the steel.

Heat Treatment of Duplex Stainless Steel 2205 by Inserting Nano Nd2FeB14 in HIP Manifolds Under the Scope of Category Theory

“…By imserting nano Nd2FeB14 in the HIP manifolds of duplex stainless steel and then making analysis for dislocation denisity we find the following: And also by applying high magnetic field we have enhanced impact energyat aging from 22-25 J to 45 to 100J depends on the magnetic field as showed in the figure (Udarne & Nerjavnega, 2015;Maehara, Koike, Fujino, & Kunitake, 1983;Hsieh, Tsai, Chang, & Yang, n.d.).…”

“…1; recognised by design l fabrication codes which are real based up on the behavior of wrought ferritic or austenitic steels. Hence codes caIl for high (uppershelf) levels of charpy toughness at minimum design temperature or below dependent upon the thickness compensation factor (Byrne, Spence, Olsen, Houghton, & MCMAHON, 1994;Park & De Cooman, 2014;Udarne & Nerjavnega, 2015).…”

Environmental Degradation of Dissimilar Austenitic 316L and Duplex 2205 Stainless Steels Welded Joints

“…This can significantly reduce mechanical properties and corrosion resistance of welded joints. To maintain acceptable properties of the joints, the ferrite content in weld metal and heat affected zone should be in the range 25-70% [4][5][6].…”

Modelling and simulation of a robotic work cell

“…The complexity and diversity of the components being the part of the robotized production workcells make it necessary to develop, already at the stage of designing, models representing various aspects of their construction and operation. For each production plant, there are a large number of subsystems and factors that directly or indirectly affect the productivity, efficiency and synchronization of a production process at that plant [3][4][5][6][7][8][9][10][11][12][13][14][15]. The complexity of the issues involved in robotized production workcells designing requires searching the proper architectural solutions in the processes of designing, modeling and simulating these systems.…”