Ageing behaviour of an Fe–20Ni–1.8Mn–1.6Ti–0.59Al (wt%) maraging alloy: clustering, precipitation and hardening
作者： E.V. Pereloma , A. Shekhter , M.K. Miller , S.P. Ringer
DOI: 10.1016/J.ACTAMAT.2004.08.018
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摘要: Abstract Changes in the solute distribution as well evolution of precipitation, microstructure and mechanical properties have been studied an experimental maraging Fe–20Ni–1.8Mn–1.5Ti–0.59Al (wt%) alloy during ageing at 550 °C. An initial hardening reaction within 5 s is reported, which remarkable terms extent rapidity. This strengthening was caused by formation complex multi-component atomic co-clusters containing primarily Ni–Ti–Al some Mn. cluster strengthened condition produced optimum toughness observed throughout sequence. After 60 ageing, appearance discrete precipitation needle-shaped η-Ni3Ti particles associated with a second rise hardness towards eventual peak 600 s. accompanied increase tensile strength decrease ductility. A reverse transformation martensite to austenite occurs progressively this contributes secondary softening.
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