Reversible temper embrittlement of rotor steels |
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Authors: | G M Spink |
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Affiliation: | (1) Central Electricity Generating Board, Scientific Services Department, North Eastern Region, Harrogate, England |
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Abstract: | The susceptibility to temper embrittlement of eight different rotor steels has been studied in terms of the effects of composition,
of cooling rate from tempering temperature, of isothermal aging, of steel-making practice and of strength level and tempering
temperature. The Ni Cr Mo V steels tested showed increasing susceptibility to temper embrittlement with increasing nickel
content. The normally marked susceptibility of a high phosphorus 3 pct Cr Mo steel was eliminated by the removal of manganese.
Embrittlement in a 3 pct Ni Cr Mo V steel was caused by the equilibrium segregation of solute atoms to the prior austenite
grain boundaries. Two Cr Mo V steels tested were not susceptible to temper embrittlement. Electroslag remelting and refining
had very little effect on the susceptibility of the steels tested. Strength level and tempering temperature had no effect
on the degree of embrittlement of the 3 pct Ni Cr Mo V disc steel. The possibilities of remedial action include an adjustment
of the post tempering cooling rate, to optimize the conflicting interests of minimum temper embrittlement and adequate stress
relief, and the production of very low manganese rotor steels. |
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