Mechanical Engineering - Engineering Materials - Discussion

Discussion Forum : Engineering Materials - Section 4 (Q.No. 5)
5.
Which of the following inpurity in cast iron makes it hard and brittle?
Silicon
Sulphur
Manganese
Phosphorus
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
7 comments Page 1 of 1.

Mayank said:   3 years ago
Thanks @Pradeep.

Rohit Raz said:   5 years ago
Thank you @Pradeep.

Fouzdar said:   5 years ago
Nice explanation. Thanks.

Sachin said:   5 years ago
Thank you @Pradeep.

Muthamizh said:   6 years ago
Very useful, thanks @Pradeep.

Montu said:   7 years ago
Thank you @Pradeep.

Pradeep said:   1 decade ago
1. Silicon: It may be present in cast iron upto 4%. It provides the formation of free graphite which makes the iron soft and easily Machinable. It also produces sound castings free from blow-holes, because of its high affinity for oxygen.

2. Sulphur: It makes the cast iron hard and brittle. Since too much sulphur gives unsound casting, therefore, it should be kept well below 0. 1% for most foundry purposes.

3. Manganese: It makes the cast iron white and hard. It is often kept below 0. 75%. It helps to exert a controlling influence over the Harmful effect of sulphur.

4. Phosphorus: It aids fusibility and fluidity in cast iron, but induces brittleness. It is rarely allowed to exceed 1%. Phosphoric irons.
(4)

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