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Name a noble metal
gold, platnium, silver
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gold, platnium, silver
Noble metals
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Dificult to macine magnesuim because
fire hazard
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is a fire hazard
Magnesuim
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Eutectic alloy
particular composition in alloy system for which solids and liquids are the same temperature
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particular composition in alloy system for which solids and liquids are the same temperature
Euthetic alloy
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Main applications of tool steel
Industry cutting tools, dies and molds
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Industry cutting tools, dies and molds main applications for
Tool Steels
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Four most Common Elements in the Earths crust
Oxygen, Silicon, Aluminum, Iron
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Oxygen, Silicon, Aluminum, Iron
Four most Common Elements in the Earths crust
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Two elements of steel
iron, carbon
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iron, carbon two elements of
steel
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Graphical Means of representing phases of metal alloys is called
Phase Diagram
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Phase Diagram is
Graphical Means of representing phases of metal alloys is called
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True of False Refractory metals can endure high temperatures
True
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What is a alloy
metall compose of two or more elements, at least one is metallic
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metall compose of two or more elements, at least one is metallic
alloy
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Alloying element used in certain steels to increase corrosion protection
chronium
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chronium used to increase
corrosion protection in alloying elements
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True or False. Stength of iron increases as carbon content increases
true
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Principle ore used in production of iron and steel is
hematite
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hematite is principle ore used in
production of iron and steel
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Percentages which defines an iron-carbon alloy as steel
0.02% to 2.11% carbon
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Three solid phases of the iron-carbon diagram
alpha, gamma, delta
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alpha, gamma, delta
Three solid phases of the iron-carbon diagram
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Parts in molds
Downsprue, riser, puring cup, core, drag, cope, flask,
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Downsprue, riser, puring cup, core, drag, cope, flask, are parts in
Mold
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In a sand cast mold what is the drag
bottom half of the mold
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bottom half of the mold
drag
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In a sand cast mold what is the cope
Upper half of the mold
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Upper half of the mold
cope
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Purpose of a riser in a sand cast mold
resovior that serves as a source of liquid metal for the csting to compensate for shrinkage during solidification
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resovior that serves as a source of liquid metal for the csting to compensate for shrinkage during solidification
is a riser
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In sand cast mold what is the downsprue
gatting system
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gatting system in sand cast mold
downsprue
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box that hold both open and closed mold casting is called
flask
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Flask is
box that hold both open and closed mold casting is called
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Two halves of a sand cast mold is seperate at what line
parting line
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Parting line is
Two halves of a sand cast mold is seperate at what line
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Metal in a sand cast mold enters at the pouring cup and proceeds down a what
runner
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runner is a part where
Metal in a sand cast mold enters at the pouring cup and proceeds down a what
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expendable mold operations
shell, vacuum, investment, expanded polyestrene, plaster-mold and ceramic-mold
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shell, vacuum, investment, expanded polyestrene, plaster-mold and ceramic-mold
expedable mold operations
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Investment casting is and also known for
wax completly covers then melts away and also known as lost-wax process
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wax completly covers then melts away and also known as lost-wax process
is investment casting
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Precision mold casting process
die casting, centrifigual casting
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die casting, centrifigual casting
Precision mold casting process
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Most widely used casting process
sand casting
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Sand casting is the most
widely used casting process
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What is flash in die casting
liquid metal under high pressure squezes into small space
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liquid metal under high pressure squezes into small space
is flash
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Advantages of permanent mold casting
reusable, easy precise opening and closing,
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reusable, easy precise opening and closing,
Advantages of permanent mold casting
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Why are Metals are heat treated?
To change mechanical properties
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In order to change mechanical properties
Metals are heat treated
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Hardenability is
property that determines the depth below the quenched surface to which steel is hardened
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property that determines the depth below the quenched surface to which steel is hardened
Hardenablity
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Most important heat treatment method for hardening steels
tempering
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Tempering is
Most important heat treatment method for hardening steels
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Quench media produces most rapid cooling rate is
brine-salt water
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brine-salt water
Quench media produces most rapid cooling rate is
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quick way to test a metal to determine what material it may be
hardness test
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hardness test is a quick way to
test a metal to determine what material it may be
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Common surface hardening treatment for metals
carburizing (most common), nitriding and carbonnitriding
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carburizing (most common), nitriding and carbonnitriding
Common surface hardening treatment for metals
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Aging is important in precipitation hardening
during aging is when high stength and hardness is achieved in the alloy
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during aging is when high stength and hardness is achieved in the alloy
that is why it is important in precipitation hardening
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Austenizing is
heating the steel to a sufficiently high temperature that is converted to austenite
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heating the steel to a sufficiently high temperature that is converted to austenite
austenizing
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