CARBIDE PHASE-CHANGES IN LOW-ALLOY CR-MO- V STEELS

The influence of tempering conditions and bulk Mo and V contents on th e carbide phase changes in three low-alloy steels 2.5Cr, 2.5Cr-0.7Mo a nd 2.5Cr-Mo-0.7-V-0.16 was investigated. Transmission electron microsc opy (electron diffraction and EDX) was used to determine the type and chemical composition of carbide particles. The M(7)C(3) carbide was co nsidered to be the most stable in the investigated steels. The influen ce of both, the tempering conditions and the bulk Mo and V contents on carbide reactions preceding the M(7)C(3) stabilization was quantified .