202 BULLETEN 184, UNITED STATES NATIONAL MUSEUM 



Iron, artificial, 25. (See also Steel.) 



alloys of, 26, 30. 



cast, 26, 34. 



cementite in, 21-23, 26. 



delta-gamma transformation in, 

 26-28. 



granulation in, 50, 51. 



hysteresis in, 28. 



l^eumann bands in, 88, 89. 



phases of, 26. 



solidification temperatures of, 27. 



thermal critical points of, 27, 28. 

 Iron-carbon alloys, 26, 28. (See also 

 Carbon.) 



cementite in, 26, 32, 34. 



eutectics, eutectoids of, 29, 34. 



gamma-alpha transformation in, 32. 



martensite in, 35, 83. 



pearlite in, 29, 33-36, 46, 85. 



phase changes in, 32. 



sorbite in, 35, 36, 84. 



troostite in, 35, 36, 83. 



transformation into alpha iron, 32. 



transformation into austenite, 32. 



transformation into ferrite,32,33,35 

 Iron-carbon equilibrium diagram, 32-35, 



41. 

 Iron-carbon structures, instances of, 84. 

 Iron-carbon structures, origin of, 85. 

 Iron-carbon system, 32-36. 

 Iron-nickel, meteoric, 45. 



Brinnell hardness, curve for, 14. 



carbide in, 23. 



cobalt in, 44. 



composition ranges of, 48. 



crystallization in, 48, 49. 



gamma-alpha transformation in, 45. 



granulation in, 49-51. 



in kamacite, 10, 51. 



in schreibersite, 20. 



solid solutions formed by, 28. 



structural changes in, 45-47. 



trias in, 47. 



Widmanstatten structure in, 45, 46, 

 Iron-nickel alloys, 36. 



alpha, 10. 



cobalt in, 44. 



gamma-alpha transformation in, 

 36, 37, 42. 



hysteresis in, 40, 42. 



in taenite, 39. 



paraeutectoids of, 36, 38, 40, 

 67-69. 



phase changes in, 36. 



transformation in, 36, 37, 43. 



Vogel mechanism in, 57. 

 Iron-nickel carbide, 23. 

 Iron-nickel compounds, intermetallic, 



39, 40. 

 Iron-nickel diagrams, 37, 40-44, 57. 

 Iron-nickel system, 36-45. 

 Iron phosphide. (See Schreibersite.) 

 Iron sulphide. (See Troilite.) 

 Ironstone, 25. 



• Octahedrite. 



' Ataxite, nickel-rich. 



» Hexahedrlte. 



« Ataxlte, nickel-poor. 



Kamacite, alpha veining in, 51. 



Brinnell hardness, curve of, 14. 



cleavage in, 4. 



cold-working in, 13. 



composition of, 10, 11, 45, 47, 51, 

 55. 



definition of, 4, 37, 45, 47. 



granulation in, 11, 12, 49-51, 62, 

 71-73. 



hardness of, 14. 



hatched, 11, 12. 



heat alteration of, 70. 5 



in ataxites, 13, 46. 



in nickel-rich ataxites, 67-69. 



in octahedrites, 4, 5, 7, 8, 11, 13, 

 16, 36, 44, 55, 56, 61, 67, 87. 



in plessite, 15, 16. 



in trias, 47. 



iron in, 10, 51. 



Neumann lines in, 88, 89. 



nickel in, 10, 11, 45, 47, 51, 55. 



oxidized, 24. 



phosphide in, 80, 89. 



phosphorus-poor, 77, 81. 



precipitation of, 55, 56. 



properties of, 10. 



rhabdites in, 60. 



saturation in taenite, 37, 39, 46, 47, 

 67, 69-71. 



sheen in, 3, 11, 12, 94. 



spotted, 11, 61. 



structural changes in, 46. 



swathing, 13, 86, 87. 



swollen plates of, 8. 



transformation of, 11. 

 Kamacite bands, 4-7, 14, 16, 23, 46, 47, 



56, 65, 74, 88, 96. 

 Kamacite needles and spindles, 7, 8, 46, 



65, 68, 69. 

 Kendall County ^ meteorite, 63, 76, 



114, 175. 

 Kenton County' meteorite, 66, 114, 



156, 157. 

 Klondike 2 meteorite, 79, 80, 114, 147. 

 Kokomo 2 meteorite, 114, 143. 



Laurens County 1 meteorite, 8, 65, 68, 



114, 133, 135, 136, 163. 

 Lawrenceite, 25. 



Leeds' meteorite, 36, 69, 114, 165, 166. 

 Limestone Creek 2 meteorite, 65, 68, 



114, 151, 152. 

 Limonite, 24, 25. 



Linville^ meteorite, 7, 40, 69, 114, 144. 

 Locust Grove ^ meteorite, 84, 85, 114, 



130, 185, 186. 



Macroetching, 11-13, 15, 16, 50, 95. 



Macroexamination, 2, 94. 



Magnetite, 24. 



Magura ' meteorite, 21, 22. 



Martensite, 35, 83, 84, 120. 



Mejillones * meteorite, 50, 51, 76, 114, 



131. 

 Mesosiderites, 25. 



