CE Mat Lab - Rockwell Hardness

All of the following are effects of cold work except:

• Yield Strength Increases

• Ductility Decreases

• Tensile Strength Increases

• Hardness Decreases

Answer explanation

The changes caused by cold working are created by...

• dislocation motion in metal lattice.

• shift from ferrite to austenite

• additional alloying of the metal.

• an increased size of the metal grain.

Answer explanation

All of the following are cold working processes except:

• Cold Forging

• Rolling

• Drawing

• Casting

• Extrusion

Answer explanation

Tags

NGSS.HS-PS1-3

What type of cold working are we going to use in this lab?

• Forging

• Rolling

• Extruding

• Drawing

Answer explanation

What type of hardness does the Rockwell Hardness Test measure?

• Indentation

• Scratch

• Rebound

In general, the Rockwell Hardness testing machines measures ...

• the elastic deformation of the material.

• the permanent deformation of the material.

• how quickly the indenter penetrates the metal.

• the heat produced by the pressure of the indenter on the material.

On these graphs of 'force' and 'indenter depth' vs. time, which variable is measured by the Rockwell Hardness testing machine to determine the hardness?

• t TA

• F

• Vf

• h

What is the minimum allowable spacing between indentations created by the Rockwell Hardness tester?

• 3 mm

• 2 mm

• 3 Times Indentation Diameter

• 2 Times Indentation Diameter

Answer explanation

At the beginning of the lab, your brass cartridge will be in what state:

• Fully Annealed

• Partially Annealed

• Cold Drawn

• Fully Brittle

What will be our targeted thickness reductions when we cold roll our brass cartridge?

• 0.5% reductions to 5%, then 1% reductions

• 1% reductions to 5%, and then 2% reductions

• 2% reductions to 10%, and then 5% reductions

• 3% reductions to 12%, and then 7% reductions