Mechanical Properties of Materials Quiz

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What property indicates a metal's hardness?

Tensile strength

Temper (correct)

Alloy designation

Malleability

Which type of steel does not accept heat treatment?

High-carbon steel

Low-carbon steel (correct)

Mangalloy

Medium-carbon steel

What is the main application of high-carbon steels?

Steel-tube construction

Springs and cutting tools (correct)

Machining

Forging

How does silicon affect the properties of steel when alloyed?

Acts as a hardener Signup and view all the answers

What is a unique characteristic of Mangalloy (manganese steel)?

Extreme anti-wear properties Signup and view all the answers

Which type of steel is especially adaptable for machining or forging?

Medium-carbon steel Signup and view all the answers

What does compressive strength measure in a metal?

Ability to withstand being pressed or squeezed Signup and view all the answers

Which type of strength relates to a metal's ability to resist shock?

Impact strength Signup and view all the answers

What does torsional strength measure in a metal?

Ability to resist rotational shear Signup and view all the answers

Which property of metals is related to their ability to resist cutting, penetration, or abrasion?

Hardness Signup and view all the answers

What does fatigue strength measure in metals?

Ability to resist repeated loading Signup and view all the answers

Which type of loading force assesses a metal's bending strength?

Bending strength Signup and view all the answers

What is the purpose of adding manganese to steel in the refining process?

To counteract the effects of sulphur and prevent brittleness Signup and view all the answers

How does phosphorus affect low-carbon steel?

It raises the yield strength and enhances resistance to corrosion Signup and view all the answers

What is the role of nickel in steel when heat-treated?

Adds strength, hardness, and increases depth of hardening Signup and view all the answers

How does the presence of sulphur affect steel during rolling or forging?

Causes brittleness and requires the addition of manganese Signup and view all the answers

What is the impact of alloying additions of sulphur in small amounts to steel?

Increases yield strength and hardness Signup and view all the answers

How does manganese improve a metal's forging characteristics?

By reducing brittleness and counteracting sulphur effects Signup and view all the answers

What is the purpose of normalising in aircraft work?

To relieve internal stresses in welded parts Signup and view all the answers

What is the difference between the particles formed in normalising and those in annealing?

Those formed in annealing are larger Signup and view all the answers

How can steel be hardened most effectively?

By quenching it rapidly in water, oil, or brine Signup and view all the answers

What could lead to failure in steel after processes like forging, welding, and machining?

Leaving stresses within the material Signup and view all the answers

In what way does cooling steel in still air after heating help in normalising?

It relieves internal stresses present in the material Signup and view all the answers

Why is it important for the alloy to be cooled rapidly after carbon disperses uniformly?

To achieve maximum hardness Signup and view all the answers

What is the main reason for alloying steel with tungsten?

To elevate the melting point Signup and view all the answers

Which type of steel is suitable for high-temperature applications like firewalls?

Stainless steel Signup and view all the answers

What characteristic of titanium steel makes it preferred for use in extreme temperature conditions?

Lightweight Signup and view all the answers

Why is pure iron not suitable for use as a structural material?

Weakness and softness Signup and view all the answers

Which component in a magneto is likely to be made of tungsten steel?

Breaker contacts Signup and view all the answers

What property of stainless steel makes it well-suited for exhaust system components?

Strength and resistance to corrosion Signup and view all the answers