Identification of non-metallic inclusions

Through this paper, we are familiar with the influence of non-metallic inclusions on the properties of steel; familiar with the classification and morphological characteristics of non-metallic inclusions.

1. Classification of non-metallic inclusions

1. According to the source of inclusions: internal inclusions, external inclusions;
2. Classified by chemical classification: oxides, sulfides, silicates and nitrides and their composite products;
3. Classification according to plasticity: plastic inclusions, brittle inclusions, semi-plastic inclusions, spherical or point-shaped non-deformed inclusions;
4. According to GB/T10561-2005 standard map, class A (sulphide), class B (alumina), class C (silicate), class D (spherical oxide), DS class (single particle spheroid) .

Typical inclusion type--sulfide (class A) inclusions

Typical inclusion type--sulfide (class A) inclusion 400X

Typical inclusion type--brittle inclusions (Class B)

Typical inclusion type--silicate (C type) inclusion 500X

Typical inclusion type - oxide (class D) inclusion 250X

Typical inclusion type - oxide (class D) inclusion 250X

Bright field

Dark field

Typical inclusion type--single-particle spherical (DS type) inclusion

Bright field 250X

Dark field 500X

Typical inclusion type - nitride inclusion 400X

1-nitride 2-oxide 3-stripe graphite

Typical inclusion type--composite inclusion 400X

Typical inclusion comparison - silicate inclusion 250X

(a) SiO2 vitreous silicate under bright field

(b) SiO2 vitreous silicate under orthogonal polarization

Comparison of typical inclusion types - oxide inclusions

Typical inclusion comparison - silicate 500X

Bright field

Dark field

Orthogonal polarization

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