AN ELECTRON DIFFRACTION ANALYSIS OF PRECIPITATES IN A 13Ni MARAGING STEEL (280kgf/mm~2)
Li Douxing and Ye Hengqiang (Institute of Metal Research; Academia Sinica)
Cite this article:
Li Douxing and Ye Hengqiang (Institute of Metal Research; Academia Sinica). AN ELECTRON DIFFRACTION ANALYSIS OF PRECIPITATES IN A 13Ni MARAGING STEEL (280kgf/mm~2). Acta Metall Sin, 1981, 17(6): 625-634.
Abstract The precipitates in 13Ni maraging steel (280 kgf/mm~2) have been identified in relation to the orientation of σ and δ phases in martensite matrix by means of X-ray and selected area electron diffraction analyses. It was shown that the precipitates as an intermetallie compound of δ-(Fe,Ni,Co)Mo are responsible for strengthening in the steel. In case as-forged after aging, μ-phase appeared may reduce its toughness. After over-aging, e. g. 580℃ for 16h, a. c., some reverted austenite was formed. From observation in situ on heating the aged specimen in electron microscope up to 743℃, the δ grains were coalesced and the needle-like σ phase precipitated. Though the diffraction patterns of δ or σ phase can be commonly indexed, the difference of orientation between δ/α and σ/α seems to be more easily used to distinguish them in the maraging steel.
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