单词 | secondary hardening |
释义 | secondary hardening [`sek·ǝn´der·ē `härd·ǝn·iŋ] METALLURGY The hardening of certain alloy steels at moderate temperatures (250-650°C) by the precipitation of carbides; the resultant hardness is greater than that obtained by tempering the steel at some lower temperature for the same time. |
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