Microstructure, mechanical and electrochemical properties of wire-arc additively manufactured duplex stainless steel

Abstract

Wire-arc additively manufactured (WAAM) super duplex stainless steels (DSS) 2594 walls were fabricated to investigate the microstructure of different regions, including top, body and root as well as the influence of microstructure on mechanical and electrochemical properties. The microstructure was composed of ferrite and austenite with a few nitride precipitates. The ferrite content decreased from top to root. The average hardness increased slightly from top to root. The ultimate tensile strength of different regions varied slightly, comparable to that of the hotrolled plate. Compared with those in vertical direction, samples in the horizontal direction had higher strength and lower elongation. The corrosion resistance ranked as root ≈ body > hotrolled > top.

Recent progress in process, structure, properties, and performance in additive manufacturing

“…The special issue contains contributions on the major variants of AM including laser DED [6,9,18,24], gas metal arc DED [7,[10][11][12][13][14]16,19,[21][22][23], laser PBF [8], cold spray [17], laser-arc hybrid manufacturing [20], and fused deposition modelling [15]. Chaurasia et al [22] presented a novel approach to real-time monitoring of melt pool cross-sectional asymmetry during laser PBF using a two-color thermal camera.…”

“…The articles in the special issue cover a wide variety of alloys including Ti alloy [6][7][8][9], steels [11,13,14,18], Ni alloys [9,16,19], and Al alloys [10,12,23]. In addition, several new materials are discussed that were specially designed for AM.…”

“…The fracture occurred in the Ta/Cu transition layer because of the presence of Ti–Cu brittle phases. Liu et al [14] studied the influence of microstructure on mechanical and electrochemical properties of duplex stainless steel 2594 parts made by gas metal arc DED. The ferrite content decreased from the top of the deposit to the substrate increasing the average hardness.…”

“…This special issue includes all aforementioned trends of progress through 19 original research articles [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The editors of STWJ invited active researchers from the AM and welding communities to contribute to this special issue.…”