Microstructural changes during welding and subsequent heat treatment of 18Ni (250-grade) maraging steel
| Autor: | V.M. Radhakrishnan, S. Sundararajan, S.K. Seshadri, C. R. Shamantha, Ramaswamy Narayanan, S. Sundaresan, K. J. L. Iyer |
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| Jazyk: | angličtina |
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Composition effects Filler wires Annealing (metallurgy) Segregation (metallography) Post weld aging Welding Filler metals engineering.material Heat treatment law.invention Thermal effects law Austenitic transformations Metallographic microstructure Gas metal arc welding General Materials Science Pulsed welding Maraging steel Austenite Mechanical Engineering Metallurgy Condensed Matter Physics Microstructure Nickel maraging steel Aging of materials Mechanics of Materials Grain boundaries Metallography engineering Grain boundary Arc welding Grain size and shape |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| Popis: | 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. ? 2000 Elsevier Science S.A. |
| Databáze: | OpenAIRE |
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