Engineering Materials
Which of the following statement is true about brittle fracture?

High temperature and low strain rates favour brittle fracture
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
Cup and cone formation is characteristic for brittle materials
Brittle fracture is always preceded by noise

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Engineering Materials
Nickel in steel

Improves cutting ability and reduces hardenability
Improves wear resistance, cutting ability and toughness
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Gives ductility, toughness, tensile strength and anti-corrosion properties

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