How does the tempering process effect hardness and ductility of the metal? a) hardness and ductility both increase b) hardness and ductility both decrease c) hardness decreases and ductility increases d) hardness increases and ductility decreases What is the minimum % Carbon in steel that allows significant quench-hardening? a) .03% b) .08% c) 0.3% d) 0.8% Which of the following is the highest hardness reading? a) 30 HRC b) 50 HRC c) 70 HRB d) 90 HRBI
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How does the tempering process effect hardness and ductility of the metal?
a) hardness and ductility both increase
b) hardness and ductility both decrease
c) hardness decreases and ductility increases d) hardness increases and ductility decreases
What is the minimum % Carbon in steel that allows significant quench-hardening?
a) .03%
b) .08%
c) 0.3%
d) 0.8%
Which of the following is the highest hardness reading?
a) 30 HRC
b) 50 HRC
c) 70 HRB
d) 90 HRBI
Initial focusing of the reflective light microscope is done with
a) a low magnification lens and the field diaphragm open
b) a low magnification lens and the field diaphragm closed
c) a high magnification lens and the field diaphragm open
d) a high magnification lens and the field diaphragm closed
Tempering of a plain carbon steel is defined as
a) rapid quenching of the annealed metal
b) cold working of the annealed metal
c) reheating the austenitized and quenched metal to an intermediate temperature
d) reheating the annealed metal to an intermediate temperature
What does rapid quenching do to the hardness and ductility of a plain high carbon steel, compared to slow cooling?
a) hardness and ductility both increase
b) hardness and ductility both decrease
c) hardness decreases and ductility increases d) hardness increases and ductility decreases
Which of the following hot rolled steels would have the most ferrite in its microstructure?
a) C1020
b) C1040
c) C1060
d) C1080
Which of the following hot rolled steels would have the most pearlite in its microstructure? a) C1020
b) C1040
c) C1060
d) C1080
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