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Similar to MSEASUSlides: Muddiest Point: Phase Diagrams V Fe-Fe3C Microstructures S…
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MSEASUSlides: Muddiest Point: Phase Diagrams V Fe-Fe3C Microstructures S…
- 1. Muddiest Points Phase Diagrams V: Fe-‐Fe3C Phase Diagram Microstructures Muddiest Points: • I don't know the difference between pearlite vs. ferrite vs. austenite vs. cemenDte. • What is the difference between microstructure and phase? • What does terminology like "eutectoid" and "proeutectoid" mean when talking about microstructure? • How do I draw microstructures given fracDons, temperature and composiDon?
- 2. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 1076 steel a&"""# t 728°C 1000 Given 1) 728°C 2) 1076 Steel !" Temperature !"#$"%&'(%")*+)) %""# 800 "#"$"!""" Fe3C +γ γ α X "#" 727°C %&%''" %&56" Fe3C $""# 600 Microstructure: α +Fe3C # !""# 400 Co 0.76% "#0 &# ComposiDon-‐ Wt% C 1 6.67 γ +,#$,-./ %&$'()*+%,&-'./*01
- 3. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 1076 steel a&"""# t 726°C 1000 Eutectic Phase Diagram Terminology !"#$%&%'()%*+,#*"%#"*$'-./0'1#/'2'34' Given 1) 726°C 2) 1076 Steel !" 5 Temperature ( !" !"#$"%&'(%")*+)) %""# * +' 800 "#"$"!""" Fe3C +γ γ ( "#"α !+!" .$'/010)2/301",) 727°C ! %&%''" X # #"!"" A' %&56" * 0.022% T A' U ./'67'.89':;<''; γ 5.$) # (' >' 3 ,-./$/0' Fe C $""# 600 1-$23' 3 Microstructure: !"#$%&#&'()#&*&') ! + α +Fe3C #" !"#$%&#&'()#&*&') '14250' "+)!,)&,)!" "+)-%)&,)#" ,-./$'6#3' # ) ) '78.%#30' Fe3C !""# 56-+7827909"*+,-3" 400 4.$) "# &#CFe C 6.67 0 Cα 56-7:7827909"*+,-3" ComposiDon-‐ Wt% C Co 1 $%&'" 0.022% *+,-+./0+)"$123"4"()'""" 0.76% $()'" (' +,#$,-./* 3 α α =/'67'.8=:;<';+7'-./02'34' α Fe3C ,-./$/0' α 1-$23'' Fe3C 14250' !"#$%& α @!=" 3' ,-./$'6#3'' @#= 1- @! " %&$'()*+%,&-'./*01 Fe3C 78.%#30' >?3'
- 4. &'""# &&!+#F 9-8?-72CE7-#F ()*+",-."/01/(1023-4)" Single Phase Region Microstructure IK#LE3C-A5C-# For 1030 steel at 1000°C &"""# X #M#J#I### "*+$# Given 1) 1000°C 2) 1030 Steel !" !$",78/" !"#$"%&'(%")*+)) %""# "#"$"!""" 5'5"9/" "*"''# "#" %&%''" %&56" MK#,-775C-# ,78/" $""# M Microstructure: #"$",78/" !""# "# 0.3% Co &# '# (# 5356) γ +,#$,-./,01)2'3)4)+) />8?>3 "#$%&$'()*+%,&-'./*01%.*,*2(.34%*2'4()*
- 5. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 1030 steel a&"""# t 850°C 1000 Given 1) 850°C 2) 1030 Steel 850 P X Q !" Temperature !"#$"%&'(%")*+)) %""# 800 "#"$"!""" Fe3C +γ γ α 727°C "#" %&%''" %&56" Fe3C $""# 600 α +Fe3C Microstructure: # !""# 400 γ "# 0 Cα 0.01% Co Cγ 0.3% 0.45% &# ComposiDon-‐ Wt% C 1 6.67 +,#$,-./ α %&$'()*+%,&-'./*01
- 6. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 1030 steel a&"""# t 728°C 1000 Given 1) 728°C 2) 1030 Steel !" Temperature !"#$"%&'(%")*+)) %""# 800 "#"$"!""" Fe3C +γ γ α S R 727°C "#" X %&%''" %&56" Fe3C $""# 600 α +Fe3C Microstructure: # !""# 400 0.76% Cγ γ "# % 0 Cα 0.022 Co 0.3% &# ComposiDon-‐ Wt% C 1 6.67 +,#$,-./ α %&$'()*+%,&-'./*01
- 7. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 1030 steel a&"""# t 726°C 1000 Given 1) 726°C 2) 1030 Steel !" Temperature !"#$"%&'(%")*+)) %""# 800 "#"$"!""" Fe3C +γ γ α "#" 727°C 0.022% X %&%''" %&56" γ T U Fe3C $""# 600 α +Fe3C Microstructure: # !""# 400 "# % 0 Cα 0.022 Co 0.3% &# ComposiDon-‐ Wt% C 1 6.67 CFe3C +,#$,-./ α %&$'()*+%,&-'./*01
- 8. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 10100 steel &"""# at 728°C 1000 Given 1) 78°C 2) 10100 Steel !" Temperature !"#$"%&'(%")*+)) %""# 800 Fe3C +γ "#"$"!""" γ α 727°C W X V "#" %&%''" %&56" γ 0.022% Fe3C $""# 600 α +Fe3C Microstructure: # !""# 400 γ "#0 ComposiDon-‐ Wt% C Cγ &#CFe C 6.67 1 Co 1% 0.76% 3 +,#$,-./ Fe3C %&$'()*+%,&-'./*01
- 9. &'""# 9-8?-72CE7-#F Phase CalculaDons ()*+",-."/ IK#LE3C-A5C- For 10100 steel &"""# at 726°C 1000 Given 1) 726°C 2) 10100 Steel !" Temperature !"#$"%&'(%")*+)) %""# 800 "#"$"!""" Fe3C +γ γ α 727°C "#" X %&%''" 0.022% Z %&56" Y γ Fe3C $""# 600 α +Fe3C Microstructure: # !""# 400 "#0 Cα 0.022% ComposiDon-‐ Wt% C &#CFe C 6.67 1 Co 1% 3 +,#$,-./ Fe3C %&$'()*+%,&-'./*01
- 10. &'""# Summary of Eutectoid Microstructures 9-8?-72CE7-#F ()*+",-."/01/(1023-4 IK#LE3C-A5C-# γ &"""# $# X α !" !$",78/" X !"#$"%&'(%")*+)) %""# "#"$"!""" α 5'5"9/" γ "#" X X X γ X %&%''" X X α %&56" Fe3C α γ -775C-# $""# #"$",78/" γ γ γ α α !""# α "#ComposiDon-‐ Wt% C &# '# α +,#$,-./,01)2'3)4)+) Fe3C α α α α "#$%&$'()*+%,&-'./*01%.*,*2(.34 α Fe3C α Fe3C
- 11. Muddiest Points Phase Diagrams V: Fe-‐Fe3C Phase Diagram Microstructures Muddiest Points: • I don't know the difference between pearlite vs. ferrite vs. austenite vs. cemenDte. • What is the difference between microstructure and phase? • What does terminology like "eutectoid" and "proeutectoid" mean when talking about microstructure? • How do I draw microstructures given fracDons, temperature and composiDon?