The Crystallization of Iron and Steel: An Introduction to the Study of MetallographyLongmans, Green, and Company, 1905 - 144 страници |
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Страница 13
... critical point at about 690 ° , called the Ar1 critical point . The critical points Ac1 , Ac2 , Acg on the heating curve of mild steel are generally a few degrees higher 10. Boudouard , Journ . Iron and Steel Inst . , 63. i . 229 , 1903 ...
... critical point at about 690 ° , called the Ar1 critical point . The critical points Ac1 , Ac2 , Acg on the heating curve of mild steel are generally a few degrees higher 10. Boudouard , Journ . Iron and Steel Inst . , 63. i . 229 , 1903 ...
Страница 14
... critical 900 800 Cooling Curve AC Healing Curve 700 ° Акт 690 ° 600 500 Ο 20 40 60 Time FIG . 10. - Steel . points on the cooling curve are , in consequence of this lag , a few degrees below the true critical point . The lag induces a ...
... critical 900 800 Cooling Curve AC Healing Curve 700 ° Акт 690 ° 600 500 Ο 20 40 60 Time FIG . 10. - Steel . points on the cooling curve are , in consequence of this lag , a few degrees below the true critical point . The lag induces a ...
Страница 15
... critical point , the passage of the hard y - iron to the soft a - iron is retarded ; the iron is then in an unstable hardened condition , ready on the least provocation to pass into the stable soft a - form . We naturally ask is there ...
... critical point , the passage of the hard y - iron to the soft a - iron is retarded ; the iron is then in an unstable hardened condition , ready on the least provocation to pass into the stable soft a - form . We naturally ask is there ...
Страница 22
... critical points , Ar , and Ar2 , of pure iron coalesce into one . At this point pure iron , or ferrite , as 1200 1000 ° Cementite Line 900 ° Arz Ferrite Line PAR Pearlite Line 600 B 400 ° 0.5 1-0 1-5 % CARBON FIG . 18. - Cooling of ...
... critical points , Ar , and Ar2 , of pure iron coalesce into one . At this point pure iron , or ferrite , as 1200 1000 ° Cementite Line 900 ° Arz Ferrite Line PAR Pearlite Line 600 B 400 ° 0.5 1-0 1-5 % CARBON FIG . 18. - Cooling of ...
Страница 40
... critical point ( 830 ° ) slowly to the Ar , point ( 730 ° ) , and then suddenly quenched in a freezing mixture at -20 ° . Martensite has the appearance of interlacing needles , shown in Fig . 26 , which is a specimen of soft rail steel ...
... critical point ( 830 ° ) slowly to the Ar , point ( 730 ° ) , and then suddenly quenched in a freezing mixture at -20 ° . Martensite has the appearance of interlacing needles , shown in Fig . 26 , which is a specimen of soft rail steel ...
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0.9 per cent Ac₁ allotropic alloys annealing Ar₁ austenite B.Sc brittle carbon in iron cast iron cementite chemical CHEMISTRY cleavage planes College Coloured constituents cooling curve copper critical point Crown 8vo crystalline grains D.Sc Diagrams ductile ELEMENTARY PRACTICAL elements Engineering equilibrium eutectic mixture eutectic point Examples ferrite fracture freezing freezing-point GEOMETRY graphite grey hard hardening hardenite heat Hospital ibid Illus Illustrations Iron and Steel J. E. Stead J. O. Arnold Journ Jüptner Lecturer liquid LL.D Lond London MAGNETISM manganese martensite mass mechanical metal Metallographist Metallurgy microscope molecules molten nitric acid numerous Osmond passive resistance pearlite Ph.D phase rule physical PHYSIOLOGY Plates polished surface Professor properties pure iron quenched Royal 8vo salt Sauveur Science separates shown in Fig silicon sodium thiosulphate solid solution solidified solution of carbon sorbite specimen steel containing Steel Inst structure Students substance sulphur temper temperature TEXT-BOOK trations TREATISE troostite Woodcuts y-iron
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