352 SUMMAKY OF CURRENT RESEARCHES RELATIXG TO 



The Constitution of the Nickel-Iron Alloys. — D. Hanson and 

 H. E. Hanson (Iron and Steel Institute Meeting, Sept., 1920). The 

 purpose of the investigation is : (1) the determination of the effect of 

 small quantities of nickel on the critical points of pure iron ; (2) an 

 examination of Osmond's theory of the nickel-iron alloys, and the deter- 

 mination, if possible, of the " stable " diagram of the nickel-iron allovs. 



F. I. G. r; 



On Graphitization of Iron-Carbon Alloys. — K. Honda and 

 T. Murakami (Iron and ^teel Institute Meeting, Sept., 1020). The 

 authors determine the period of graphite formation in iron-carbon alloys 

 during cooling, and the condition of its occurrence. F. I. G. R. 



On the Formation of Spheroidal Cementite. — K. Honda and S. 

 Sait6 (Iron and Steel Institute Meeting, Sept., 11)20.) The conclusions 

 reached are :— 1. If a quenched specimen be heated to below Acl, 

 sorbitic cementite spheroidizes. 2. If a hyper-eutectoid steel be heated 

 above Acl, but below the solubility line, and quenched, the spheroidiz- 

 ation of the super-eutectoid takes place. 3. If a lamellar pearlitic steel 

 be heated to just Acl, or a little above, for a certain interval of time, 

 spheroidization takes place. 4. Granular pearlite spheroidizes by being 

 heated below Acl for a sufficiently long time. 5. If Acl be not reached, 

 the spheroidization of lamellar cementite can never proceed. If the 

 maximum temperature exceed a certain limit above Acl and the steel be 

 then cooled, cementite appears as a lamellar pearlite. 6. The tempera- 

 ture interval of spheroidization in low-carbon steels is very small, 

 extending to only about 20' C ; it increases rapidly with the content of 

 carbon. In verv hiuh carbon steels the interval amounts to about 

 100 C. ' ^ F. I. G. R. 



Indian Iron Making" at Mirjati Chota, Nagpur. — A. McWilliam 

 (Iron and Steel Institute Meeting, Sept., 11)20). Under the microscope, 

 sections of the iron showed mainly normal wrought-iron structure, 

 but with bands of varying and much higher carbon content. Several 

 sections were examined microscopically, and the carbon content was seen 

 to vary from nearly nil to the eutectoid point. F. I. G. R. 



Intercrystalline Fracture in Mild Steel. — AV. Rosenhain and 

 I). Hanson (Iron and Steel Institute Meeting, Sept., 1920). 



Experiments on the De-oxidization of Steel with Hydrogen. — 



J. II. Whiteley (Iron and Steel Institute Meeting, Sept., 11)20). 



On Spherical Shell Crystals in Alloys. — J. E. Stead (Institute 

 of Metals, Autumn Meeting, Sheffield, 11)19). This is the first instalment 

 of the author's work on this subject. Some truly beautiful photographs 

 of structures in the allovs of tin, antimonv, and arsenic are given. 



F^. I. G. R. 



Distinguishing Lead in Brass and Bronze.— F. P. Galligan and 

 J. J. OuJiRAN {Metal InduMry, June 25, 1920, 16, No. 26). A criticism 

 on the method of distinguishing lead in brass and bronze by the apphca- 

 tion of sulphide etching, pointing out that as a means of detection it 

 has no advantages, that lead is best detected in a polished and unetched 

 specimen. 



