Effect of Elevated Temperatures on Certain Mechanical Properties of Gray Cast Iron and Malleable Iron

Elastic properties of cast iron

“…For example, MacKenzie [1] and Bolton [4] compared resilience values with those representing the carbon content, plus one-fourth of the silicon content. Values of C+Si/4, for irons A, B, and o were computed and were plotted against total resilience, as shown in figure 7.…”

“…The presence of these particles decreases the amount of metallic material available to resist stressing in a given section and causes nonuniform distribution of stresses, but the quantitative interpretation of these effects is as yet unsettled. In the consideration of the behavior of cast iron in compression, the question whether the spaces occupied by the graphite particles should be considered as voids or as spaces filled with compressible, partly compressible, or incompressible material, 191 has been discussed by several authors, for example, MacKenzie [1]/ Thum and Ude [2], Meyersberg [2a], Pearce [3], and Bolton [4]. Aside from the general weakening or depreciation of properties, because of the presence of the relatively soft graphite flakes, the nonhomogeneous structure frequently leads to erratic results in determinations of the properties and renders their interpretation uncertain.…”

“…The properties of iron A were more susceptible than those of B or a to variations in the maximum heating temperature. 4. Variations in the temperatures at which the test bars were poured had less effect than variations in maximum heating temperature on the composition, properties, and structure.…”

Elastic properties of some alloy cast irons

“…The values of these moduli decreased in the following order: E l , E 2, E I (8) and E2 (8). There was a rather small difference between Ell E2, and E I (8) values, but E 2 (S) was considerably lower, 6. The ratios of the average ultimate plastic resilience, W4 (the area below the load-plastic-deflection curve between the origin and the ordinate drawn to the plastic-deflection curve at the point of rupture), and ultimate total resilience, WI (area below the load-totaldeflection curve and between the origin and the ordinate drawn to the total deflection curve at the point of rupture), were considerably higher for irons M and N than for iron L.…”

“…In his work on the influence of phosphorus on iron, MacKenzie [5] plotted the ultimate total-deflec- tion values against the carbon content plus one-fourth of the silicon content and found that there was an increase of deflection with an increase of C+Sij4 values. His diagram indicated that deflection depends more on C+Sij4 values than on phosphorus content [6]. An attempt was made by the present writers in their previous paper [1] to find whether a corresponding relation to C+ Sij4 content may be shown for the ultimate total-resilience values.…”