MMET 207 FINAL EXAM PREP QUESTIONS
T or F: Limestone is added to remove impurities in molten steel. - Answers :False
T or F: Hyper-eutectic steels are above 4.3% carbon - Answers :False
Which parameter from tensile testing indicates ductility and toughness? - Answers
:Percent reduction in area
The fatigue strength of metal is evaluated by determining the: - Answers :Endurance
limit
Which process uses an ingot electrode to refine steel for tool steel applications? -
Answers :Electroslag melting
Annealing of a cold worked steel results in which change in property? - Answers :Higher
impact strength
T or F: The modulus of elasticity of hardened low carbon steel is the same as the
modulus of elasticity of annealed low carbon steel. - Answers :True
T or F: Carburizing is a diffusion treatment that depends upon substitutional atomic
movement. - Answers :False
Which alloy element has the greatest effect in moving the cooling curve to the right
(away from the y-axis)? - Answers :Chromium
Which diffusion treatment produces a structure that does not require follow up heat
treatment to create a very hard outside surface and refined grains in the core? -
Answers :Nitriding
T or F: Tool steels that are "air hardened" have the lowest safety in hardening because
the formation of martensite is uncontrollable. - Answers :False
The most significant metallurgical difference between tool steels and other steel is that
the microstructure - Answers :contains alloy carbides (in addition to martensite)
T or F: Ferritic stainless steels have a BCC ferrite microstructure and since they have
low carbon levels, have excellent weldability. - Answers :False
T or F: The most common (popular) stainless steels by tonnage are 300-series
austenitic stainless including 304, and 216, as well as 304L and 316L - Answers :True
T or F: A class of 20 gray cast iron has significantly less carbon than a class 60 gray
cast iron, contributing to the increase in hardness and tensile strength. - Answers :False
T or F: Limestone is added to remove impurities in molten steel. - Answers :False
T or F: Hyper-eutectic steels are above 4.3% carbon - Answers :False
Which parameter from tensile testing indicates ductility and toughness? - Answers
:Percent reduction in area
The fatigue strength of metal is evaluated by determining the: - Answers :Endurance
limit
Which process uses an ingot electrode to refine steel for tool steel applications? -
Answers :Electroslag melting
Annealing of a cold worked steel results in which change in property? - Answers :Higher
impact strength
T or F: The modulus of elasticity of hardened low carbon steel is the same as the
modulus of elasticity of annealed low carbon steel. - Answers :True
T or F: Carburizing is a diffusion treatment that depends upon substitutional atomic
movement. - Answers :False
Which alloy element has the greatest effect in moving the cooling curve to the right
(away from the y-axis)? - Answers :Chromium
Which diffusion treatment produces a structure that does not require follow up heat
treatment to create a very hard outside surface and refined grains in the core? -
Answers :Nitriding
T or F: Tool steels that are "air hardened" have the lowest safety in hardening because
the formation of martensite is uncontrollable. - Answers :False
The most significant metallurgical difference between tool steels and other steel is that
the microstructure - Answers :contains alloy carbides (in addition to martensite)
T or F: Ferritic stainless steels have a BCC ferrite microstructure and since they have
low carbon levels, have excellent weldability. - Answers :False
T or F: The most common (popular) stainless steels by tonnage are 300-series
austenitic stainless including 304, and 216, as well as 304L and 316L - Answers :True
T or F: A class of 20 gray cast iron has significantly less carbon than a class 60 gray
cast iron, contributing to the increase in hardness and tensile strength. - Answers :False
