1. a. A thin piece of 0.3mm thick hot-rolled strip of 1080 steel is heat-treated
ID: 1843815 • Letter: 1
Question
1.
a. A thin piece of 0.3mm thick hot-rolled strip of 1080 steel is heat-treated in the following way. Use the IT diagram for steel and other knowledge to determine the microstructure of the steel sample after the heat treatment. Heat Treatment: Heat for 1 hour at 860 oC ; cool in a molten salt bath at 700 oC and keep it in the bath for 2 hours then cool it in water, this results in a _________ microstructure.
b. A thin piece of 0.3mm thick hot-rolled strip of 1080 steel is heat-treated in the following way. Use the IT diagram for steel and other knowledge to determine the microstructure of the steel sample after the heat treatment. Heat Treatment: Heat for 1 hour at 860 oC ; cool in a molten salt bath at 260 oC and keep it in the bath for 1 minute then cool it in air, this results in a __________ microstructure and this heat treatment would be called __________
c. A thin piece of 0.3mm thick hot-rolled strip of 1080 steel is heat-treated in the following way. Use the IT diagram for steel and other knowledge to determine the microstructure of the steel sample after the heat treatment. Heat Treatment: Heat for 1 hour at 860 oC ; cool in water, reheat to 860 oC for one hour and cool in air. This results in a _________ microstructure.
Explanation / Answer
A)
Heating 1 hr to 860 C and cooling (quenching) in molent salt bath for 700C and 2 hr cooling in air then
Micro structure name is :Coarse pearlite
B)
Heating 1 hr to 860 C and cooling (quenching) in molent salt bath for 350C and 1 min cooling in air then
Micro structure name is :Bainite
heat traetment is austempering
C)
Heating 1 hr to 860 C and cooling (quenching) in molent salt bath for 860C and 1 hr cooling in air then
Micro structure name is :Austenite.
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