The effects of composition and carbide precipitation on temper embrittlement of 2.25 Cr-1 Mo steel: Part II. Effects of Mn and Si

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The effects of additions of 0.7 pct Mn and/or 0.6 pct Si on the temper embrittlement behavior of 2.25 Cr-1 Mo steel at several hardness levels were determined. As in Part I, the tendency for the P segregation was dependent upon the Mo concentration in the ferrite, which is controlled by the types of carbides formed during heat treatment or aging. Additions of either Mn or Si increase the fraction of grain boundaries which adsorb P (although they do not increase the P concentration on the embrittled boundaries significantly) thereby raising the amount of temper embrittlement as measured by the transition temperature shift. Mn and Si appear to act independently and their effects appear to be additive; this is rationalized in terms of their expected influences on the segregation free energy for P in Fe.

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