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MSEASUSlides: Muddiest Point: Phase Diagrams III Fe-Fe3C Phase Diagram Introduction Slide Set
- 1. Muddiest Points Phase Diagrams III: Fe – Fe3C Phase Diagrams Muddiest Points: • What is the difference between eutectoid, hypoeutectoid, and hypereutectoid? • What are ferrite, austenite, and cemenBte? • “Reading the phase diagram was very tough.” • “I don’t know what 1020, 1060, or 10100 steel means.” • “What does each phase represent? What is gamma?”
- 2. What Are Characteristics of Important(/#0123-#4526728# ,-.,- Phases on Fe – Fe3C Diagram? Austenite-‐ (γ) Gamma Iron: FCC iron with Inters//al solid &$""# &)(%B/# &!C(B/# solu/on of C up to 2.14 wt. % C &!""# !# D# &(C!B/# EF#D# * @-8:-72>A7-#B/## &'""# &&!+#B/# 2.14 !*(# EG#HA3>-<5>-# &"""# C&'B/# EF#,-(/# %""# #I#F#E### +'+#B/# * "*+$# "*"''# $""# IG#,-775>-# I#F#,-(/# ,-(/G#/-8-<;>-# !""# "# &# '# (# !# )# $# $*+"# Ferrite-‐(α) Alpha Iron: BCC Iron /98:935;9<.#=>*#?#/# with inters//al solid solu/on of C up to 0.022 wt% carbon Carbide (CemenBte)-‐ Iron Carbide: A hard and "#$%&$'()*+%,&-'./*01%.*,*2(.34%*2'4()*51,2%*&''42*(.$'*$6'*)(7%8%.$*2'4()*51 bri@le stoichiometric (fixed composi/on) compound, Fe3C. It has an orthorhombic crystal From Wikimedia Commons structure. Author: #=Orci ; *=ARTE #
- 3. Fe-‐Fe3C Phase Diagram &$""# &)(%B/# &!C(B/# &!""# !# D# &(C!B/# EF#D# @-8:-72>A7-#B/## &'""# &&!+#B/# 2.14 !*(# EG#HA3>-<5>-# &"""# C&'B/# EF#,-(/# %""# #I#F#E### +'+#B/# "*+$# "*"''# $""# IG#,-775>-# I#F#,-(/# ,-(/G#/-8-<;>-# !""# "# &# '# (# !# )# $# $*+"# /98:935;9<.#=>*#?#/#
- 4. &'""# &&!+#F/# 9-8?-72CE7-# Fe-‐Fe3C Phase Diagram Eutectoid ReacBon-‐ Steel IK#LE3C-A5C-# &"""# γ γ+ Fe3C Temperature °C %""# α + γ 727 °C 0.022 0.76 $""# α α + Fe3C Fe3C M#J#,- !""# "# CEutectoid &# '# (# 6.67 Hypoeutectoid Comp. Hypereutectoid Comp. Composi/on-‐ Wt. % C />8?>35@>A
- 5. &(G!F/# IJ#H# 9-8?-72CE7-#F/## &'""# Steel Terminology & Phase ProperBes &&!+ ()*()+,"-./0)"12/34/5"678)98:2;"<)/9=:>*"?8 IK#LE3C-A5C-# &"""# General Proper/es: #M#J#I### "*+$# !" !$"()+," • Ferrite: α -‐ BCC Fe 0.022 wt% C max. DucBle. !"#$"%&'(%")*+)) %""# "#"$"!""" D'D"F," • Austenite: γ -‐ FCC Fe 2.14% C max. DucBle. "*"''# %&%''" %&DE" • CemenBte: Fe3C – Stoichiometric. Hard and bri`le ceramic. MK#,-775C-# $""# "#" #"$"()+," ()+," !""# "# +5('"6',.7) &# '# (# 8389) SAE-‐AISI Terminology: YY XXX Carbon Steel ABC:)78)98:2;",:5C&" ABC)4)78)98:2;",:5C&" • First 2 or 3 digits give steel alloy type +,#$,-./,01)2'3)4)+) />8?> • 10xx is plain carbon steel (no alloy elements) "#$%&$'()*+%,&-'./*01%.*,*2(.34%*2'4() AISI Carbon Steel ClassificaBon Chart • 41xx is a common alloy steel (Cr 0.5-‐0.95%; Mo 0.12-‐0.30%) • See h`p://www.keytometals.com/page.aspx? ClassificaBon % Carbon ID=CheckArBcle&site=kts&NM=333 for more informaBon Low Carbon <0.30% C Medium Carbon 0.30%-‐0.60% • Second 2 or 3 digits give %C content x 100 High Carbon 0.60%-‐1.00% • YY80 has 0.80 wt% C Ultrahigh Carbon 1.25%-‐ 2.00% • YY100 has 1.0 wt.% C
- 6. ApplicaBons for Steel Types Low Carbon Steel: Used for automobile body panels * and low-‐strength wires * Medium Carbon Steel: Used for axles, gears, rails, and railway wheels # High Carbon Steel: Used for springs and high-‐ strength wires * 41XX Alloy Steels: Used for components in fossil fuel and nuclear power plants See h@p://www.keytometals.com/Ar/cles/Art62.htm for more informa/on *= From Clker.com #= Wikimedia Commons, author Rkingsbury-‐ Background removed
- 7. How Does Carbon Content Affect Mechanical Properties? ,-.,-(/# #&!" #'!" Yield a!"#$%&'(%&)#(*"$#&+,-#(.,/&01234& (MPA) nd Tensile Strength #'!" ,-.,-(/#0123-#452 #)!" #)!" G&'F/# #!!" % ElongaBon !"#$%&'()%&" )#(*"$#&+,-#(.,/& #!!" (!" &$""# &)(%F/# &$""# &)(%F/# &!G(F/# &!G(F/# (!" &!" &!""# !# &!""# !# !"#$%&+,-#(.,/& &!" '!" *"+,-./01-." &(G!F/# IJ#H# &(G!F/# 9-8?-72CE7-#F/## &'""# '!" &'""# )!" &&!+#F/# IK#LE3C-A5C-# IK#LE3C-A5C-# !" !$%" #" !" !$%" #" &"""# 56786*"96(&0:,;&54&& &"""# *%+,%-.)%&"/01!"*2"" I### ComposiBon (wt% C) ComposiBon (wt% C) "*+$# Temperature °C Temperature °C %""# %""# "*"''# MK#,-775C-# $""# $""# M#J !""# !""# "# ComposiBon (wt% C) &# "# ComposiBon (wt% C) '# &# (# />8?>35@ As wt% C :Yield and Tensile Strength and % ElongaBon
- 8. Muddiest Points Phase Diagrams III: Fe – Fe3C Phase Diagrams Muddiest Points: • What is the difference between eutectoid, hypoeutectoid, and hypereutectoid? • What are ferrite, austenite, and cemenBte? • “Reading the phase diagram was very tough.” • “I don’t know what 1020, 1060, or 10100 steel means.” • “What does each phase represent? What is gamma?”