Classification of ferrous alloys Cast irons Steels (>2wt%C) (<2wt%C) Grey iron (1-3wt%Si) White iron (<1 wt%Si) Low alloy (<10 wt% alloying elements) High alloy (>10 wt% alloying elements) Stainless (211wt%Cr) Low-C (k0.25wt%C) High-C Medium-C (0.25-0.6wt%C) 0.6-1.4wt%c Plain PDF文件使用"pdfFactory Pro”试用版本创建www,fineprint.com.cn
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A L+8 0.53 Fe-FeC phase diagram 1538 4.1.1 Carbon B1495 8+ steel 1394 0.17 L+Y 1227 Temp. Content 1148 L+FeC of carbo F Meaning 2.11 4.3 C (wt%) Eutectic point G912 Y+Fe,C 1148 43 L+Y土FGd a+y The Maximum 0.77 727 E1148 2.1 solubility of carbon iny phase 0.02 912 0 a分Y Fe,C The Maximum 727 0.02 solubility of carbon a+Fe,C in a phase Eutectoid point 727 0.8 Hypoeutectic Hypereutectic Y+--ap+FesC White iron White iron Fe 3 6 6.69 Cwt% PDF文件使用"pdfFactory Pro" 试用版本创建www.fineprint.com.cn
g a+g A C D E F a Hypereutectic White iron 1148 G 912 727 2.11 4.3 Hypoeutectic White iron B 0.53 N 0.17 H 1394 1538 1495 d+g L+g L+d d a+Fe3C g+Fe3C Fe3C 0.77 Q P S L L+Fe3C K Fe 1 2 3 4 5 6 6.69 1227 C wt% 4.1.1 Carbon steel Fe- Fe3C phase diagram 0.02 P u r e ir o n H y p o e u t e c t oid s t e el H y p e r e ute ctoid Ste el Temp. (°C) Content of carbon (wt%) Meaning C 1148 4.3 Eutectic point LC←→ gE＋ Fe3C E 1148 2.1 The Maximum solubility of carbon in g phase G 912 0 a«g P 727 0.02 The Maximum solubility of carbon in a phase S 727 0.8 Eutectoid point g←→ aP ＋Fe3C S y m b ol PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
Iron-carbon equilibrium diagram 2800 δ+L -FERRITE (ALPHA-IRON) 2600 6+y LIQUID (L) y+L Y-AUSTENITE (GAMMA IRON) 2200 Eutectie L +Fe,C Point Fe,C-IRON 1800 CARBIDE CEMENTITE x+y Y +FesC 1400 Eutectoid 13330F Point 1000 a+FesC 0.83% 2.00% 4.30% 6.67% HYPO HYPER HYPOEUTECTIC HYPEREUTECTIC CARBON EUTECTOID STEEL CAST IRON PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn
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4.1 Ferrous metal 4.1.1 Carbon steel Ferrite (o iron): An interstitial solid solution of a small amount of carbon dissolved in iron with a Body Centered Cubic (B.C.C.)crystal structure. It is the softer alloy in the iron- carbon diagram. The solubility of carbon at eutectic temperature (727C) reaches the maximum with 0.022wt% PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn
4.1 Ferrous metal 4.1.1 Carbon steel Ferrite (a iron): An interstitial solid solution of a small amount of carbon dissolved in iron with a Body Centered Cubic (B.C.C.) crystal structure. It is the softer alloy in the ironcarbon diagram. The solubility of carbon at eutectic temperature (727°C) reaches the maximum with 0.022wt% PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
Austenite Also known as (Y gamma-iron,which is an interstitial solid solution of carbon dissolved in iron with a face centered cubic crystal (F.C.C)structure.The maximum solubility of carbon reaches 0.8wt%at eutectic temperature(727C)and 2.11wt%at 1148℃ PDF文件使用"pdfFactory Pro”试用版本创建www,fineprint.com.cn
Austenite Also known as (ɣ ) gamma-iron, which is an interstitial solid solution of carbon dissolved in iron with a face centered cubic crystal (F.C.C) structure. The maximum solubility of carbon reaches 0.8wt% at eutectic temperature (727°C) and 2.11wt% at 1148℃ PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn