By Karl-Erik Thelning
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Extra info for Steel and its Heat Treatment. Bofors Handbook
Sample text
The methods of solving various types of differential equations are obtainable in works of reference . There follows some examples that should be of interest to those involved in heat treatment. They may also be re-read alongside the various processes as they are discussed later in this book. 7 CARBURIZ ATION For the sake of simplicity it is assumed that the surface of the steel acquires a carbon concentration corresponding to the carbon potential of the carburizing medium and that the carbon concentration in the outermost layer remains constant during the whole process.
1. e. unhardened or fully hardened and tempered steel. F o r a hardness greater than 450 H B it is advisable to use a sintered-carbide ball which may be used up to about 650 H B. For plain and low-alloy carbon steels the Brinell hardness number is approximately proportional to the ultimate tensile strength, U T S ( U T S in kgf/mm or k p / m m - HB/3). The Brinell hardness test is often used to supplement other mechanical tests since it is much quicker and cheaper than the tensile test and may be considered as a nondestructive test.
9) we obtain t = 2 0 6 x 10 s = 5-72 h. 6 DISLOCATIONS In a perfect iron crystal the atoms are arranged in a regular pattern, which we have previously discussed. In order to produce shear in a perfect crystal all the atoms in a slip plane must move simultaneously. 27 shows a section through the slip plane, illustrating how this slip can take place. A nearly perfect crystal of iron (whisker) has a strength more than 100 times the strength of ordinary mild steel. In general, however, the lattice is far from perfect.