IN-713C CHARACTERISTIC PROPERTIES OPTIMIZED THROUGH DIFFERENT HEAT-TREATMENTS

The strength of a nickel-based superalloy hardened through precipitati on is related to the volume fraction, particle size and distribution o f the precipitated phase, gamma'. These parameters may vary as a resul t of heat treatment, or high-temperatures service. The information obt ained, describing the influence of time and temperature on the precipi tated phase, gamma', is of special importance owing to its technologic al application at high temperatures. Dissolution or precipitation kine tics are such that the volume-fraction balance of the gamma' phase is quickly established at an ageing temperature given by successive chang es due only to the particle growth. The results of the present study d escribe heat-treatment effects on size and distribution of the gamma' Phase, and precipitated carbides ageing of a nickel-based superalloy ( IN-713C). These on ageing studies at a certain temperature show that t he kinetic growth of gamma' particles by controlled diffusion follows that r is-proportional-to t1/3 law.