MEEN 361 - Hardness Prelab Quiz
In the lab you had tested how many carbon steel alloys? -1 alloy and 1 stainless steel -2 alloys and 1 stainless steel -3 alloys and 1 stainless steel -4 alloys and 1 stainless steel
2 alloys and 1 stainless steel
In the Hardness test experiment, you will be using -Rockwell and Vickers Hardness test machine -Vickers Hardness test machine -Brinell Hardness test machine -Rockwell Hardness test machine
Rockwell Hardness test machine
Find the false statement -Hardness test locally increases the hardness values of the material -A standard deviation more than 2.5 should result in extra data collection on the sample -Empirically, for carbon steels: TS(psi)=500*BH -Unknown materials should always be tested with HRB (hardest tip available) first
Unknown materials should always be tested with HRB (hardest tip available) first
Which of the following IS NOT standard practice in hardness testing -Using a calibration sample -Performing a number of tests to gain adequate statistics -Using a thin sample to enable indenting all the way through its thickness -Spacing indents at least 3 diameters apart from each other
Using a thin sample to enable indenting all the way through its thickness
What hardness value is not reported in the right scale? -A steel with reported HRC=47X -A tempered steel reported in HRB while its HRB=115 and its HRC=15 (47) -A quenched steel reported in HRB while its HRB=102 and its HRC=21 -An alloy with hardness reported as HRB=9.5X
A quenched steel reported in HRB while its HRB=102 and its HRC=21
Which of the following materials would you expect to have the highest hardness: -Silicone rubber -Aluminum -Copper -Alumina (Al2O3)
Alumina (Al2O3)
Which one is not one of the advantages of hardness test over other mechanical tests? -Being cheap to perform -Hardness being the most important property of the material in design problems -There is a correlation between hardness value some other mechanical properties -Non-destructive
Hardness being the most important property of the material in design problems
Which one is not one of the advantages of hardness test over other mechanical tests? -Hardness being the most important property of the material in design problems -Correlation of hardness value to other properties -Non-destructive -Being cheap to perform
Hardness being the most important property of the material in design problems
The hardness tester applies the ....... force to the sample to establish reference depth. -Minor -Minor, then major, and then minor -minor, then major -Major
Minor
Hardness testing -cannot be used to definitely determine mechanical properties beyond hardness -is relatively expensive -destroys the sample, similar to tensile testing -measures a material's resistance to local plastic deformation
measures a material's resistance to local plastic deformation
