Properties of high-purity iron

Abstract

Results are recorded of new determinations of the workability, microstructure, density, and the thermal, mechanical, electrical, and magnetic properties of high-purity iron, in which the maximum amount of an individual impurity was 0.004 percent and the total of impurities in any specimen was 0.01 percent or less.

Interferometer measurements on the expansion of iron

“…------- Figure 4 is a reproduction of Nix and MacNair's figure V [4], on which the results of the present investigation and those of H idnert and Dorsey have been superimposed. The purpose is to show that the results obtained in the present investigation for the range from room temperature to 400 0 C are a smooth continuation of the trend followed by the results obtained by others for relatively pure iron in the range below 0 0 C. This plot also shows that the improved data now obtained are in reasonable agreement with those that Hidnert obtained by a different method [11]. Moreover, it appears that other values than those used by Nix and MacNair for the required constants must be used, if a Grueneisen curve is obtained that will conform with the expansivity as temperature changes.…”

“…In none of these cases was the plateau-like effect observed but, in the range 25° to 150°C, the results of the present author were lo.wer than those of Hidnert and Emerson as shown in figure 9 of the publication by Cleaves and Hiegel [11] . It was believed that this discr epancy in the author's data, which reached a maximum of about 3 percent of the expansivity at 25°C, was the result of small temperature gradients that developed (on heating at a r ate of 1 degree C pel' minute) between the r efraction thermometer and the rather massive specimens of iron that were used.…”

Preparation and Properties of Consumable-Elec Trode Vacuum-Arc-Melted Electrolytic Iron

“…This value is some 4 percent lower that that reported by Cleaves of the National Bureau of Standards (4). Similar measurements of the 99.999 percent versus platinum gave 1.95 mv for the thermoelectric force.…”

The Preparation and Properties of High-Purity Iron

“…references 3, 13, 14 using dilatometric methods) have quoted temperatures of 924°-935°C. for the beginning of .A.C3, but in recent years the main body of evidence, obtained by X-ray,15,16 thermal-analysis, 9,17 dilatometric,9,18 magnetometric,19 specific-heat,17. 20 and thermal-e.m.f.17 methods, indicates a temperature in the range 909°± 2°C.…”

“…The crucibles rest on a quartz disc sealed to a quartz rod (11), which fits into the brass base (10). The melting chamber (5), ·made of Pyrex glass, is surrounded by the water-cooling jacket (13), and is closed at the bottom by a brass cap and O-ring seal assembly (9). The temperature of the charge can be m.easured by an optical pyrometer via a prism (15), whilst solid additions can be made to the melt by inverting tube (16).…”