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Influence of plastic deformation and prolonged ageing time on microstructure of a Haynes 242 alloy
Author(s) -
DYMEK S.,
WRÓBEL M.,
DOLLAR M.,
BLICHARSKI M.
Publication year - 2006
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2006.01645.x
Subject(s) - ageing , microstructure , alloy , materials science , deformation (meteorology) , metallurgy , severe plastic deformation , composite material , medicine
Summary The material used in this study was a commercial HAYNES® alloy 242™ with a nominal composition of Ni‐25% Mo‐8% Cr (in wt.%). In the standard heat treatment, the 242 alloy is annealed at a temperature between 1065 and 1095 °C and then water quenched. The ageing treatment is carried out at 650 °C for 24 h in order to develop the long‐range‐order strengthening. The alloy in the conventionally aged condition was additionally cold rolled to 50% reduction in thickness and subsequently subjected to prolonged ageing at 650 °C for 4000 h. The enhanced diffusion resulted in the decomposition of the Ni 2 (Mo,Cr) metastable phase into the stable Ni 3 Mo‐based phase. The presence of the new stable phase increased the yield and tensile strengths but deteriorated the ductility of the alloy at both room and 650 °C temperatures.