Hardness Tests and Charpy Impact Test
Hardness Tests and Charpy Impact Test
Objectives:
1) To compare the hardness between mild steel, carbon steel through Vickers Hardness Test. 2) To compare the hardness between High Quality Carbon Steel and ASSAB steel through Rockwell Hardness Test. 3) To compare the hardness between carbon steel and mild steel through Brinell Hardness Test. 4) To study the differences between mild steel and carbon steel upon Charpy Impact Test.
Introduction:
Hardness is a measure of the resistance of a metal to permanent (plastic) deformation. The hardness of a metal is measured by forcing an indenter into its surface. The indenter material, which is usually a ball, pyramid, or cone, is made of a material much harder than the material being tested.
The hardness of a metal depends on the ease with which it plastically deforms. Thus the relationship between hardness and strength for a particular metal can be determined empirically. The hardness test is much simpler than the tensile test and can be nondestructive. For these reasons, the hardness test is used extensively in industry for quality control.
Here are the tests that usually used to determine the hardness of a material. 1) Vickers Hardness Test 2) Rockwell Hardness Test 3) Brinell Hardness Test 4) Charpy Impact Test
* Vickers Hardness Test
The Vickers hardness test method consists of indenting the test material with a diamond indenter, in the form of a right pyramid with a square base and an angle of 136 degrees between opposite faces subjected to a load of 1 to 100 kgf. The full load is normally applied for 10 to 15 seconds. The two diagonals of the indentation left in the surface of the material after removal of the load are measured using a microscope and their average calculated. The area of the sloping surface of the indentation is calculated. The Vickers hardness is the quotient obtained by dividing the kgf load by the square mm area of indentation.
F=Load in kgf d =
Objectives:
1) To compare the hardness between mild steel, carbon steel through Vickers Hardness Test. 2) To compare the hardness between High Quality Carbon Steel and ASSAB steel through Rockwell Hardness Test. 3) To compare the hardness between carbon steel and mild steel through Brinell Hardness Test. 4) To study the differences between mild steel and carbon steel upon Charpy Impact Test.
Introduction:
Hardness is a measure of the resistance of a metal to permanent (plastic) deformation. The hardness of a metal is measured by forcing an indenter into its surface. The indenter material, which is usually a ball, pyramid, or cone, is made of a material much harder than the material being tested.
The hardness of a metal depends on the ease with which it plastically deforms. Thus the relationship between hardness and strength for a particular metal can be determined empirically. The hardness test is much simpler than the tensile test and can be nondestructive. For these reasons, the hardness test is used extensively in industry for quality control.
Here are the tests that usually used to determine the hardness of a material. 1) Vickers Hardness Test 2) Rockwell Hardness Test 3) Brinell Hardness Test 4) Charpy Impact Test
* Vickers Hardness Test
The Vickers hardness test method consists of indenting the test material with a diamond indenter, in the form of a right pyramid with a square base and an angle of 136 degrees between opposite faces subjected to a load of 1 to 100 kgf. The full load is normally applied for 10 to 15 seconds. The two diagonals of the indentation left in the surface of the material after removal of the load are measured using a microscope and their average calculated. The area of the sloping surface of the indentation is calculated. The Vickers hardness is the quotient obtained by dividing the kgf load by the square mm area of indentation.
F=Load in kgf d =