Cementite is also known as iron carbide which has a chemical formula,Fe;C.Its crystal structure is orthorhombic.Hard and brittle 0.4515nm Iron atom ●Carbon atom 0.5077nm Crystal lattice of Fe;C PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..con.cn
Cementite is also known as iron carbide which has a chemical formula, Fe3C. Its crystal structure is orthorhombic. Hard and brittle Crystal lattice of Fe3C Iron atom Carbon atom PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn
Pearlite:It is the eutectoid mixture containing 0.83 Carbon and is formed at 1333F on very slow cooling.It is very fine platelike or lamellar mixture of ferrite and cementite. The hardness of pearlite is higher than that of phase. Coarse pearlite Fine pearlite PDF文件使用"pdfFactory Pro”试用版本创建www,fineprint.com.cn
Coarse pearlite Fine pearlite Pearlite: It is the eutectoid mixture containing 0.83 % Carbon and is formed at 1333oF on very slow cooling. It is very fine platelike or lamellar mixture of ferrite and cementite. The hardness of pearlite is higher than that of a phase. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
4.1 Ferrous metal 4.1.1 carbon steel Y+Fe3C onjeodwI Y+a 727°C 0.02 a+Fe,C Pearlite(FeC existing in form of pearlite) 100% 0.4 0.8 Cwt% Fe PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn
C o o l i n g p r o c e s s o f H y p o e u t e c t i c s t e e l 4.1 Ferrous metal 4.1.1 carbon steel 0.4 0.8 g g g g g+a a+Fe3C 0.02 727°C T e m p e r a t u r e ° C g+Fe3C g g g a Pearlite (Fe3C existing a in form of pearlite） a 100% Fe C wt% g PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
7.1 Ferrous metal 7.1.1 carbon steel Y+FesC y+a 727C ojeodwL 0.02 Fe;C a+Fe;C Pearlite (O existing in form of pearlite) 0 1.02.03.04.05.0 6.0 C wt% 100% Fe PDF文件使用"pdfFactory Pro”试用版本创建www.fineprint.com.cn
g+a a+Fe3C 0.02 727°C T e m p e r a t u r e ° C g+Fe3C a 100% Fe 0 1.0 2.0 3.0 4.0 5.0 6.0 C wt% Fe3C g g g g g g g g g 7.1 Ferrous metal 7.1.1 carbon steel C o o l i n g p r o c e s s o f H y p e r e u t e c t i c s t e e l Pearlite (a existing in form of pearlite） PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
Martensite:A metastable phase produced by rapid cooling of steel,which is defined as an interstitial,supersaturated solid solution of carbon in iron having bet lattice structure.It contains same carbon content as in y phase,hard and brittle. Needlelike Martensite 1000× (C<0.6%) Flake Martensite (C>0.6%) PDF文件使用"pdfFactory Pro”试用版本创建w.fineprint.com.cn
Martensite： A metastable phase produced by rapid cooling of steel , which is defined as an interstitial, supersaturated solid solution of carbon in iron having bct lattice structure. It contains same carbon content as in g phase，hard and brittle. Flake Martensite (C＞0.6%) Needlelike Martensite 1000´ （C<0.6%) PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn