Hardness Tests And Charpy Impact Test
TITLE
Hardness Tests And Charpy Impact Test
OBJECTIVE
1. To compare the hardness of the carbon steel, mild steel and ASSAB steel using three different hardness tests, which are Vickers Hardness Test, Rockwell Hardness Test and Brinell Hardness Test. 2. To study the hardness of mild steel, carbon steel and ASSAB which is an important in engineering to design structures or components that related in mechanical properties
3. To determine the resistance of carbon steel and mild steel against sudden impact by Charpy Impact Test.
INTRODUCTION
Hardness is a measure of a material’s resistance to localized plastic deformation. It also is one of the important properties to be considered. Mechanical properties of metals are a vital of engineering to design the components which using predetermined materials such that unacceptable levels of deformation and failure will not occur.
Hardness is a resistance of properties of material to permanent (plastic) deformation caused by steel ball or pyramid-shape diamond when it is pressed onto its surface. There will be three basic method of Hardness Test that will be carried out on carbon and metal: (a) Vickers Test (b) Rockwell Test (c) Brinell Test
THEORY
1. Vickers Test
VHN = Applied load / Surface area of depression
=
= 1.854 P/ d2 (approximate)
Where P = applied load (kgf) d = (d1+ d2) / 2 (mm)
2. Rockwell Test HRC = 100 – d /0.002 HRB = 130 – d /0.002
Where d = depth of the indentation
3. Brinell Test
BHN = Applied force / curve area of indentation P / D/2 [D - (D² - d²)] = P / Dh Where P = applied load (kgf) D = diameter of steel ball (mm) d = diameter of resulting indentation (mm) h = depth of indentation (mm) = ½ [D - (D² - d²)]
APPARATUS 1. Set of Vickers
Hardness Tests And Charpy Impact Test
OBJECTIVE
1. To compare the hardness of the carbon steel, mild steel and ASSAB steel using three different hardness tests, which are Vickers Hardness Test, Rockwell Hardness Test and Brinell Hardness Test. 2. To study the hardness of mild steel, carbon steel and ASSAB which is an important in engineering to design structures or components that related in mechanical properties
3. To determine the resistance of carbon steel and mild steel against sudden impact by Charpy Impact Test.
INTRODUCTION
Hardness is a measure of a material’s resistance to localized plastic deformation. It also is one of the important properties to be considered. Mechanical properties of metals are a vital of engineering to design the components which using predetermined materials such that unacceptable levels of deformation and failure will not occur.
Hardness is a resistance of properties of material to permanent (plastic) deformation caused by steel ball or pyramid-shape diamond when it is pressed onto its surface. There will be three basic method of Hardness Test that will be carried out on carbon and metal: (a) Vickers Test (b) Rockwell Test (c) Brinell Test
THEORY
1. Vickers Test
VHN = Applied load / Surface area of depression
=
= 1.854 P/ d2 (approximate)
Where P = applied load (kgf) d = (d1+ d2) / 2 (mm)
2. Rockwell Test HRC = 100 – d /0.002 HRB = 130 – d /0.002
Where d = depth of the indentation
3. Brinell Test
BHN = Applied force / curve area of indentation P / D/2 [D - (D² - d²)] = P / Dh Where P = applied load (kgf) D = diameter of steel ball (mm) d = diameter of resulting indentation (mm) h = depth of indentation (mm) = ½ [D - (D² - d²)]
APPARATUS 1. Set of Vickers