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.

摘要： 试验用UNS N06625合金（/%:0.027C,0.005S,0.005P,0.27Si,0.07Mn,21.68Cr,62.93Ni,9.00Mo,3.98Nb,0.20Ti,1.22Fe,0.143A1）由3 t中频感应炉熔炼,3 t电渣炉重熔后锻造成材。采用Gleeble 1500D热模拟实验机对UNS N06625合金进行了950~1180℃变形速率5 s^-1的拉伸以及变形速率1,5,10 s^-1真应变0.9的压缩实验,得到了该合金的变形抗力、断面收缩率和真应力应变曲线。通过分析变形抗力和断面收缩率,确定了UNS N06625合金的热加工温度区间为975~1180℃;研究了变形温度和变形速率对该合金动态再结晶的影响;通过拟合计算应力应变数据,建立了UNS N06625合金的峰值应力模型和动态再结晶临界变形量模型。5 t电渣锭的生产实践表明,该合金合适的开坯加热温度为1120℃。

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