[현미경 표준조직]탄소강 주철

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탄소강 주철의 현미경 표준조직 사진 및 설명입니다.

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[현미경 표준 조직] 탄소강 주철
Ferrite
MagnificationX100
Etching reagent3％ Nital（Approx.12s）
CompositionC 0.02％，Si 0.24％，Mn 0.22％，P 0.005％，S0.017％
Heat treatment950℃X1hAir cool（Normalizing）
Hardness40 to 70 HB
Tensile strength216 to 314 N/・（22 to 32 ・f/・）
Elongation40 to 50 ％
Pearlite and Ferrite
Magnification×500
Etching reagent3％ Nital（Approx.10s）
CompositionC 0.46％，Si 0.24％，Mn 0.69％，P 0.020％，S 0.022％
Heat treatment930℃Xl hAir cool（Normalizing）
Hardness150 to 200 HB
Tensile strengthApprox. 588N/・（60・f/・）
ElongationApprox. 22％
Pearlite
Magnification×500
Etching reagent3％ Nital（Approx. 8s）
CompositionC 0.88％，Si 0.28％，Mn 0.36％，P 0.020％，S 0.013％
Heat treatment900℃X5hFurnace cool（Anneaing）
Hardness180 to 200 HB
etwork Cementite
Magnification×200
Etching reagent3％ Nitric acid-Alcohol solution（Approx. 10s）
CompositionC 1.16％，Si0.24％，Mn 0.46％，P 0.013％，S 0.017％
Heat treatment950℃×2h Furnace cool（Anneaing）
Hardness220 to 250 HB
Globular Cementite
Magnification×200
Etching reagent3％ Nital（Approx. 8s）
CompositionC 1.16％，Si 0.24％，Mn 0.46％，P 0.013％，S 0.017％
Heat treatmentAfter heating at 760℃×3h, cool down to 720℃ in furnace，and keep at 720℃×4h, then cool down to room temperature in furnace
Hardness160 to 210 HB
Tensile strength588 to 735N/・（60 to 75・f/・）

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