Abstract
The rate of phosphorus segregation to the free surface of a low carbon Ni-Cr steel con-taining 0.06 wt pct P was found to be severely retarded at 833 K by the addition of 0.3 wt pct titanium to the alloy. The results indicate that the reported elimination of temper embrittlement in a phosphorus doped low carbon Ni-Cr steel, by a titanium addition, is due to inhibition of phosphorus segregation to grain boundaries because of removal of phosphorus from solid solution. An analysis of the segregation kinetics led to the con-clusion that the titanium addition lowered the concentration of phosphorus in solution to 0.012 ± 0.002 wt pct at 833 K. This was confirmed by experiments on a titanium-free al-loy containing 0.015 ± 0.0015 wt pct phosphorus.
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