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| Phase Transformations During Composite Hromization of Steel 20 |
| WU Cuilan; LUO Chengping; ZOU Ganfeng |
| College of Mechanical Engineering; South China University of Technology; Guangzhou 510641 |
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Cite this article:
WU Cuilan; LUO Chengping; ZOU Ganfeng. Phase Transformations During Composite Hromization of Steel 20. Acta Metall Sin, 2004, 40(10): 1074-1078 .
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Abstract The morphology and formation mechanism of the microstructure of the
composite ion-nitrided plus chromized layers obtained at various
chromization temperatures in a plain low-carbon steel (steel 20)
were investigated using metallography, X-ray diffraction and microanalysis.
It was found that the surface zone of the composite--chromized
layers obtained at various temperatures was composed of the phases
in which the fractiondecreased with increasing
the chromization temperature. During chromization of the nitrided
layer, the diffusion-controlled reaction transformation occurred within
the white (compound) layer of the former nitrided layer, forming a
white composite-chromized layer. Meanwhile, the precipitation/eutectoid
reaction took place in the transition (diffusion) zone of the nitrided
layer during air cooling from a chromization temperature at or above
580℃, resulting in the formation of nitride precipitate
zone and/or an eutectoid zone similar to
the pearlitic structure.
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Received: 12 November 2003
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