Journal ArticleDOI
Microstructural changes during welding and subsequent heat treatment of 18Ni (250-grade) maraging steel
C. R. Shamantha,Ramaswamy Narayanan,K. J. L. Iyer,V.M. Radhakrishnan,S.K. Seshadri,S. Sundararajan,S. Sundaresan +6 more
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In this article, gas tungsten-arc welded 18Ni (250-grade) maraging steel was used with two different filler wires: one matching the base material in composition and the other with higher cobalt but lower molybdenum and titanium contents.Abstract:
Sheet material specimens from 18Ni (250-grade) maraging steel were gas tungsten-arc welded using two different filler wires: one matching the base material in composition and the other with higher cobalt but lower molybdenum and titanium contents. Welding was carried out both in constant-current and pulsed modes. Post-weld aging was performed at three different temperatures, viz., 425, 480 and 520°C. Metallographic characterization revealed pronounced segregation, presumably of Ti and Mo, along interdendritic and intercellular boundaries in the weld metal produced with filler of matching composition. This led, during subsequent aging, to austenite reversion at temperatures much lower than in wrought (unwelded) material. Segregation and austenite reversion were not noticed when Ti and Mo contents were reduced in the filler wire, except at the highest aging temperature used. The use of pulsed welding resulted in some grain refinement, but the effect was not considerable.read more
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Aging Behaviour and Mechanical Performance of 18-Ni 300 Steel Processed by Selective Laser Melting
TL;DR: In this article, an 18-Ni 300 grade maraging steel was processed by selective laser melting and an investigation was carried out on microstructural and mechanical behaviour as a function of aging condition.
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Microstructural evolution and mechanical properties of maraging steel produced by wire + arc additive manufacture process
TL;DR: In this article, the microstructure and mechanical properties of maraging steel parts were investigated and the micro-hardness and tensile strength of the as deposited alloy reduced from the bottom to the top due to the transient thermal cycling, which resulted in partial aging and non-uniform formation of intermetallic compounds along the building direction.
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Effects of austenite reversion during overageing on the mechanical properties of 18 Ni (350) maraging steel
TL;DR: In this article, the sequence of austenite reversion during overageing in 18 Ni (350) maraging steel was examined and its effects on the mechanical properties were evaluated.
Journal ArticleDOI
Effect of heat treatment on the microstructure and mechanical properties of maraging steel by selective laser melting
TL;DR: In this paper, the authors investigated the solution phenomenon, aging behavior and room-temperature mechanical properties of maraging steel manufactured by selective laser melting (SLM), and different heat treatment experiments, including solution treatment (ST), direct aging treatment (DAT) and solution+aging treatment (SAT), were designed.
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Plastic anisotropy of additively manufactured maraging steel: Influence of the build orientation and heat treatments
TL;DR: In this article, the combined effect of three primary additive manufacturing (AM) build orientations (0°, 45°, and 90°) and an extensive array of heat treatment plans on the plastic anisotropy of maraging steel 300 (MS1) fabricated on the EOSINT M280 Direct Metal Laser Sintering (DMLS) system was investigated.
References
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Journal ArticleDOI
Weld microstructure refinement in a 1441 grade aluminium-lithium alloy
TL;DR: In this paper, the weld beads obtained under (i) continuous current (CC), (ii) pulsed current (PC), and (iii) arc oscillation (AO) conditions for their macro- and microstructural details were compared.
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Reverted austenite during aging in 18Ni(350) maraging steel
Xiaodong Li,Zhongda Yin +1 more
TL;DR: In this paper, the evolution of reverted austenite in 18Ni(350) maraging steel was examined using transmission electron microscopy, and the types of reverted Austenite observed were determined by the aging temperature and time.
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A study on local heat transfer of 18Ni maraging steel after electron beam welding
TL;DR: In this paper, electron-beam high-speed isothermal heating local aging treatment strengthened austenite but not martensite to improve the strength of joints is pointed out, basing on this investigation.