AbstractThe growth kinetics ofγ′precipitates in Ni based wrought superalloys was investigated, using a computer aided X-ray analysis method. It was found that the growth process obeys the Lifshitz–Slyozov–Wagner law. Regression formulae describing the liquidus, solidus, andγ′solvus temperatures as functions of the overall composition were established. The heat treatment window as a function of composition and its effect on homogenisation and retained hardness were determined. The high retained hardness of homogenised Al + Ti rich alloys hinders their commercial use as Ni base wrought superalloys.MST/3206