In the theoretical analysis of reversible tempering brittleness, most attention has been paid to the segregation of harmful impurities-phosphorus and its chemical analogs (As, Sn, Sb)-along the grain boundaries, which weakens the binding of the grains [1-3]. Since industrial steel contains more phosphorus than As, Sn, and Sb, it plays the greatest role in grain-boundary embrittlement. The harmful effect of phosphorus depends not only on its concentration but also on the alloying and final structure of the steel and the total area of the grain boundaries.
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