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Tensile properties and fracture toughness of 18Ni (250 grade) maraging steel weldments
Kudli Jatavallabha Lakshminarayana Iyer, Vellore Margabandhu Radhakrishnan, Suresh Krishnamoorthy Seshadri
Published in IOM Communications Ltd.
Volume: 5
Issue: 5
Pages: 329 - 337
Gas tungsten arc welding was performed on 18Ni (250 grade) maraging steel sheet using two different filler wires: one of the same composition as the base material and the other containing more cobalt and aluminium and less molybdenum and titanium. Weld specimens were then aged under four different sets of conditions. After metallographic characterisation, mechanical properties including hardness, tensile strength and ductility, and fracture toughness were evaluated. Results showed that use of the matching filler material led to lower strength but higher ductility than in the other case; this was attributed to the presence of reverted austenite in the former (caused by segregation, especially of molybdenum) at the fusion zone substructure boundaries. In both types of weld metal, a re-solution treatment followed by aging at 480° C resulted in optimum tensile properties. Fracture toughness of the aged weldments was in general close to that of the parent material aged at 480° C; some deterioration occurred only when welds with pronounced segregation were made at high temperature.
About the journal
JournalScience and Technology of Welding and Joining
PublisherIOM Communications Ltd.
Open AccessNo