Pre$-$laboratory Exercise

What are the Rockwell hardness $($on the B or C scales$)$ of steels of Vickers Hardness

Number $($VHN$)$ of:

a$)$ abc,

b$)$ cba?

Where "abc" are the last $3$ non$-$zero numbers from your student number $($ex$.$

Student number $012345678$ gives values of $678$ and $876$ VHN $).$

"abc"s value is $860$

Use the Conversion

Table below and linear interpolation where necessary.

Method of linear interpolation:

Linear interpolation equation:

$\frac{RH1-RH}{RH1-RH2}=\frac{VHN1-VHN}{VHN1-VHN2}$