Ni-doped Fe/Nickel in Iron
- Practical Electron Microscopy and Database -
- An Online Book -

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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

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The generic term, martensite, refers to a class of microstructures formed by diffusionless phase transformation in which the original and formed phases have a specific crystallographic relationship. In the alloys where the solute atoms occupy the interstitial positions in the martensitic lattice (e.g. carbon in iron), the structure is hard and highly strained; but where the solute atoms occupy the substitutional positions (such as nickel in iron), the martensite is soft and ductile. The degree of high-temperature phase that transforms to martensite by cooling depends significantly on the lowest temperature reached.

Table 2875a. Nitrogen solubility in Fe-Ni related alloys.

Materials

Nitrogen, wt%
Temperature (°C)
Fe-10%Ni
0.02 (at N2 pressure of 1 atm)
1000
Ni-20%Fe
0.0001 (at N2 pressure of 1 atm)
1000
Fe-18Cr-12Ni-2Ti
0.18
985 - 1040
0.21
1093
0.26
1150 - 1210

Table 2875b. Diffusion coefficients (cm2/s) of elements in Fe-Ni alloys.

Temperature
700 °C 800 °C 900 °C

Nitrogen (N) in Fe-20Ni

1.17 x 10-8
3.86 x 10-8 1.47 x 10-7

 

 

 

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