关键词: UNS N06625合金, 峰值应力, 动态再结晶临界变形量, 热成形工艺, 加热温度

Abstract: The tested alloy UNS N06625 (/% : 0.027C, 0.005S, 0.005P, 0.27Si, 0.07Mn, 21.68Cr, 62.93Ni, 9.00Mo, 3.98Nb, 0.20Ti, 1.22Fe, 0.143Al) is melted by a 3t medium frequency induction furnace, remelted by a 3t ESR furnace and forged to products. The tensile test at 950〜1180℃ with deformation rate 5 s^-1 and the compression test with deformation rate 1, 5 and 10 s^-1 and true strain 0.9 of alloy UNS N06625 have been earned out by Gleeble 1500D thermal simulator to get the deformation resistance, reduction of area and true stress-strain curves. With analysis on deformation resistance and reduction of area of the alloy, it is defined that the hot-working temperature zone of alloy UNS N06625 is 975〜1180℃ ; the effect of deformation temperature and rate on dynamic recrystallization of the alloy is studied and the peak stress model and the critical deformation model for dynamic recrystallization of alloy UNS N06625 are established by combined calculation of stress and strain data. The production practice of 5t ESR ingot shows that the suitable breakdown temperature of the alloy is 1120 °C.