Materials for engineering, 3rd Edition - (Malestrom)

Metals and alloys 115
3.30 Optical micrograph of spheroidal graphite cast iron (unetched)
× 500.
summary table of the properties of these materials as we have attempted
to do in the case of non-ferrous alloys. In Appendix IV, we give an outline
of the sources of material property data, and the reader must be guided
by this when seeking information on the properties of ferrous alloys.
Table 3.8 simply gives an indication of their range of density and Young’s
modulus.
3.3 Joining of metals and alloys
Metals may be joined together by mechanical fastening, by soldering or
brazing, which employs a layer of metal of lower melting-point than the
metals to be joined, by welding, in which the basis metals are fused, and by
adhesive bonding, which employs a non-metallic layer.
3.3.1 Mechanical fastening
The important process of rivetting will not be considered here. One important
consideration regarding such joints is the question of whether corrosion
problems arise in their vicinity and this aspect will be referred to in Section
3.4.2.
Table 3.8 Density and Young’s modulus of ferrous materials
Alloy Density (Mg m –3 ) Young’s modulus (GPa)
Structural steels ~7.9 ~210
Grey cast irons ~7.05 100–145