$1.$ Fill in the next table to clarify, why different chemical alloying is used with steels.

Chemical alloying The primary material property which is gained by this chemical alloying:

Si

Mn

Cr

Ni

Mo

V

Al

Co

W

Ti

B

S

$2.$ Get prepared to explain what is meant with the following material properties:

$-$ Ultimate tensile strength

$-$ Yield strength

$-$ Fatigue strength

$-$ Modulus of elasticity

$-$ Shear modulus

$-$ Ductility

$-$ Hardness

$-$ Stiffness

$-$ Creep strength

$-$ Shear strength

$3.$ Which loading cases and material properties are probably in key role when designing the following machine components?

Machine

component The most probable

loading case Critical material property

A single ball in ball bearings

Power transmission shaft

A helical damping spring of a suspension system in cars

Gear $($wheel$)$

Steel beam in a bridge construction

$4.$ Select a suitable and typical steel type for the following applications:

Application Suitable steel type

Power transmission shaft

Welded body structure

Helical spring

Gear $($wheel$)$

Roller bearing

$5.$ Fill in the following table dealing with heat treatments of steels:

Heat treatment Purpose

Normalizing

Quench and temper

Induction hardening

$6.$ Explain what are following steel types:

$-$UHSS

$-$AHSS

$-$HSS

$-$QT steels