On precipitation in an Fe-Cr-Ni-Mn-Mo-W-V-Nb-N alloy,following prolonged ageing at 650°C |
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Authors: | Li Yuqing Li Qikai |
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Abstract: | The main existing intergranular phase in the alloy observed is thick lamellar and small plate-like M6C. Owing to the presence of M6C precipitates, intergranular M23C6 nucleates at these locations and coherently precipitates to form a thin lamellar and large-sized filmy single crystal. The misfit of M23C6 with M6C obtained from the moiré pattern is 3%. Intragranular M6C and M23C6 twin along their own planes (111), and the resulting twins keep a coherent relationship with austenite. The misfit of VC precipitated along dislocations with the matrix is smaller than that of dispersed VC with the matrix. Intragranular Laves phase together with intragranular M6C and VC strengthens the alloy grains. |
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Keywords: | intergranular precipitation intragranular precipitation orientation relationship misfit |
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