Question

please make sure it is correct

Different hardness measurement techniques utilize different techniques to quantify plastic deformation. While considered as a measure of plastic deformation to characterize the indentation in Vickers's test; Rockwell test uses Ou diagonal width O diameter diagonal diameter depth OIV diagonal, depth

Answer 1

Question:

Different hardness measurement techniques utilize different techniques to quantify plastic deformation. While_____________is considered as a measure of plastic deformation to characterize the indentation in Vicker's test, Rockwell test uses_______________.

• i.Diagonal,width
• ii. Diameter, diagonal
• iii. Diameter, depth
• iv. Diagonal, depth

Answer: iv. Diagonal, depth

Explanation:

Vicker's Hardness Test:

* In vicker's hardness test, a pyramid shape Vicker's Hardness test:- indenter is used # The surface of which, the harness is to be measured is kept on an anvil and load is applied on thie indenter for around 20 seconds and removed * The following indentation mark is observed Indenter Indentation * Vickers hardness number is given by 유 VIHIN = P А 2P sino/ d2 Vitton = P = Applied load in kg A = Surface mea of the indentation in qmm d = length of the diagonal in mm o - Angle benveel opposite faces of diamond pyramid shape

From the above explanation in the image it is clear that diagonal of the indenter is important to find out the Vicker's Hardness Number (VHN). So in the above image the indentation's diagonal 'd' is considered at the plastic deformation state.

Rockwell Hardness Test:

Rockwell Hardness Test # Rockwell hardness test generally uses 1200 sphero-conical diamond indenter. * Rockwell hardness number ( RHNI is based on an inverse relationship to the measurements of additional depth diamond indenter depth to which indenter is forced by minor load depth to which indenter is forced by major load Inncrement in depth due to increament in: Load #Based on the depth - the ( Rockwell hardness is measured Number)

From the above explanation in the image we see that depth of indentation (Plastic deformation stage) is the main factor for calculation of Rockwell Hardness Number.