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What is the effect of phosphorus and sulphur in cast irons?

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in Engineering Material & Metallurgy by (773k points)
What is the effect of phosphorus and sulphur in cast irons?

(a) Induces brittleness

(b) Increases strength

(c) Destabilizes cementite

(d) No effect

I had been asked this question during an online exam.

The above asked question is from Cast Irons in section Non Ferrous Materials of Engineering Material & Metallurgy

1 Answer

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Correct option is (a) Induces brittleness

The best I can explain: Although sulphur stabilizes cementite, it causes brittleness. The same is true for phosphorus, due to which both elements are limited to a minimum quantity. Manganese is used to increase the strength of an iron, which also controls the harmful effects of sulphur.

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