18%Niマルエージング鋼におけるNi3Mo析出物の電子顕微鏡による研究

清水 謙一, 岡本 尚機

doi:10.2320/jinstmet1952.35.3_204

Transmission electron microscopy and electron diffraction studies were carried out in order to make clear the crystallographic property of strengthening precipitates in an 18%Ni maraging steel. The primary precipitate observed in the maximum hardness state was rod in shape, the size being about 25 Å in width and 500 Å in length. The length direction was parallel to the ⟨111⟩ of the matrix, and the crystal structure was identified as the orthorhombic Ni₃Mo intermetallic compound. The orientation relationship between the Ni₃Mo precipitate and the matrix was proposed to be (010)_Ni3Mo\varparallel(011)_α′, [100]_Ni3Mo\varparallel[1\bar11]_α′; that is, the closest packed plane and the direction of precipitates were parallel to those of the matrix, as observed in many other precipitation phenomena. When the ordering of atoms in the Ni₃Mo crystal is disregarded, the relationship can be represented by Burgers relationship which is well known in the bcc to hcp phase transformation. The length direction ⟨111⟩ of the Ni₃Mo precipitate was verified to be the [1\bar11]_α′ involved in the above orientation relationship. The interfacial coherency between the Ni₃Mo precipitate and the matrix was examined referring to the orientation relationship and the length direction. The hexagonal Ni₃Ti phase was also detected as the secondary precipitate.

18%Niマルエージング鋼におけるNi<SUB>3</SUB>Mo析出物の電子顕微鏡による研究

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