EXPERIMENTAL REPORT - MATERIALS AND HEAT TREATMENT (Ho Viet Cao Cuong - BKHCM) Full
12 thg 12, 2024 | 20:08

EXPERIMENTAL REPORT - MATERIALS AND HEAT TREATMENT (Ho Viet Cao Cuong - BKHCM) Full



BÁO CÁO THỰC NGHIỆM - VẬT LIỆU VÀ XỬ LÝ NHIỆT (Hồ Việt Cao Cường - BKHCM)


Lab. 1: HARDNESS TESTING WITH METALS 

(Date of Experiment: June 16th, 2020) 

 

I.   EXPERIMENTAL TARGETS 

-  Understand the principle of Brinell, Rockwell and Vicker hardness 

measurement method. 

-  Familiar and practice the common hardness equipment. 

 

II.  THEORECTICAL SUMARY 

  A. Characteristics And Methods Of Hardness Measurement: 

-  Hardness is the ability to resist local plastic deformation, under the 

effect of load through the puncture. 

-  Hardness measurement method has advantages: 

  From the measured hardness value, the strength of ductile metal can 

be deduced. 

  Simple hardness measurement, short time (from a few seconds to a 

few minutes). The test sample is not specially prepared. Do not 

destroy samples during testing. 

  We can measure very large or very small, very thick or very thin 

(plating layers, permeate ...) 

-  Measuring methods: 

  Puncture method: 

+  Brinell hardness measurement method. 

+  Rockwell hardness measurement method. 

+  Vicker hardness method. 

  The bounce method. 

 

 

[HO VIET CAO CUONG]    [1752119] 

3  MATERIALS AND HEAT TREATMENT REPORT 

B. Brinell Hardness Measurement Method 

-  The principle of this method is to press a hardened, hardened steel ball 

on the surface of the sample, under the effect of the load, on the surface of 

the sample, there is a glove-shaped dent. 

-  Using the nose is a spherical steel ball. 

-  The surface of the test piece shall be clean, flat and free from defects. 

-  Only measurements of hardness less than 450HB are allowed to avoid 

deformation of the pellet marbles. 

C. Rockwell Hardness measurement method 

-  This method is done by pressing diamond or hard alloys cone, with a 

corner at the top of 1200, or a steel ball with a diameter of 1/16 ", 1/8", 1/4 ", 

1/2 ”onto material surface. 

-  The Rockwell method allows measurement of samples with a 

hardness higher than 450HB, or thin models, smaller than 1.2mm. 

-  Rockwell hardness can be measured on specialized machines, or 

multimeters. 

D. Vicker hardness method. 

-  The Vicker method is the same in principle as the Brinell method, but 

in this test, we use diamond intender instead of  steel ball and the applied 

loads are much smaller than it in Brinell test. 

-  Diamond intender shape is needle nose, with an angle between the 

two sides is 1360 

-  Vicker measurement method is usually used to measure the hardness 

of thin objects, absorbent layers ... 

 

III.  DETAILED EXPERIMENT 

-  Take HRA measurement 3 times and take the average value 𝐻𝑅𝐴̅̅̅̅̅̅. 

-  Measure the HRC 3 times and take the average value 𝐻𝑅𝐶̅

...










LINK DOWNLOAD (TÀI LIỆU VIP MEMBER)



BÁO CÁO THỰC NGHIỆM - VẬT LIỆU VÀ XỬ LÝ NHIỆT (Hồ Việt Cao Cường - BKHCM)


Lab. 1: HARDNESS TESTING WITH METALS 

(Date of Experiment: June 16th, 2020) 

 

I.   EXPERIMENTAL TARGETS 

-  Understand the principle of Brinell, Rockwell and Vicker hardness 

measurement method. 

-  Familiar and practice the common hardness equipment. 

 

II.  THEORECTICAL SUMARY 

  A. Characteristics And Methods Of Hardness Measurement: 

-  Hardness is the ability to resist local plastic deformation, under the 

effect of load through the puncture. 

-  Hardness measurement method has advantages: 

  From the measured hardness value, the strength of ductile metal can 

be deduced. 

  Simple hardness measurement, short time (from a few seconds to a 

few minutes). The test sample is not specially prepared. Do not 

destroy samples during testing. 

  We can measure very large or very small, very thick or very thin 

(plating layers, permeate ...) 

-  Measuring methods: 

  Puncture method: 

+  Brinell hardness measurement method. 

+  Rockwell hardness measurement method. 

+  Vicker hardness method. 

  The bounce method. 

 

 

[HO VIET CAO CUONG]    [1752119] 

3  MATERIALS AND HEAT TREATMENT REPORT 

B. Brinell Hardness Measurement Method 

-  The principle of this method is to press a hardened, hardened steel ball 

on the surface of the sample, under the effect of the load, on the surface of 

the sample, there is a glove-shaped dent. 

-  Using the nose is a spherical steel ball. 

-  The surface of the test piece shall be clean, flat and free from defects. 

-  Only measurements of hardness less than 450HB are allowed to avoid 

deformation of the pellet marbles. 

C. Rockwell Hardness measurement method 

-  This method is done by pressing diamond or hard alloys cone, with a 

corner at the top of 1200, or a steel ball with a diameter of 1/16 ", 1/8", 1/4 ", 

1/2 ”onto material surface. 

-  The Rockwell method allows measurement of samples with a 

hardness higher than 450HB, or thin models, smaller than 1.2mm. 

-  Rockwell hardness can be measured on specialized machines, or 

multimeters. 

D. Vicker hardness method. 

-  The Vicker method is the same in principle as the Brinell method, but 

in this test, we use diamond intender instead of  steel ball and the applied 

loads are much smaller than it in Brinell test. 

-  Diamond intender shape is needle nose, with an angle between the 

two sides is 1360 

-  Vicker measurement method is usually used to measure the hardness 

of thin objects, absorbent layers ... 

 

III.  DETAILED EXPERIMENT 

-  Take HRA measurement 3 times and take the average value 𝐻𝑅𝐴̅̅̅̅̅̅. 

-  Measure the HRC 3 times and take the average value 𝐻𝑅𝐶̅

...










LINK DOWNLOAD (TÀI LIỆU VIP MEMBER)

M_tả
M_tả

Chuyên mục:

Không có nhận xét nào: