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Engineering Materials

Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 48
RC 65
RC 80
RC 57

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Engineering Materials
Delta-iron occurs between the temperature ranges of

400°C to 600°C
1400°C to 1530°C
900°C to 1400°C
600°C to 900°C

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Engineering Materials
In high speed steels, manganese is used to tougher the metal and to increase its

Critical temperature
Yield point
Melting point
Hardness

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Engineering Materials
If a refractory contains high content of silicon, it means refractory is

Basic
Neutral
Brittle
Acidic

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Engineering Materials
Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C
900°C to 1400°C
400°C to 600°C
600°C to 900°C

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Engineering Materials
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

In still air
Suddenly in a suitable cooling medium
Slowly in the furnace
Any one of these

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