镍基耐蚀合金高温加工特性的研究

HOT-WORKING CHARACTERISTIC OF NICKEL BASE CORROSION RESISTANT ALLOY

采用Thermomacmaster-Z热模拟试验机和TEM研究了G3、G3-Z和825镍基耐蚀合金1030℃～1350℃、应变量(ε)0～0.8、变形速率5s-1、25s-1的应力-应变曲线和温度对合金变形抗力和断面收缩率的影响。结果表明,随着温度的升高,合金的变形抗力及其最大值降低,断面收缩率先上升后下降。825合金的高温变形抗力低于G3及G3-Z合金,而热塑性优于G3及G3-Z合金;锻态G3合金高温变形抗力大于铸态G3-Z合金,而高温热塑性优于G3-Z。G3、G3-Z、825合金的热加工最高温度分别为1240℃、1220℃和1240℃。

The stress-strain curves of the nickel base corrosion resistant alloy G3, G3-Z and 825 with strain（e） 0 -0.8, strain rates 5s-1, 25s-1 at 1 030- 1 350 ℃ and the effect of tempera- ture on deformation resistance and reduction of area of alloys were studied by using Thermomacmaster- Z tester and TEM. Results showed that with increasing temperature, the deformation resistance and its maximum value decreased, and the reduction of area of alloys increased first then decreased. The high deformation resistance of 825 was lower than that of G3 and G3-Z alloys, while its hot ductility better than the latter. The high deformation resistance of G3 was higher than that of G3-Z, while its hot ductility better than the latter. The highest temperature for hot-working of G3, G3-Z and 825 alloy was 1 240℃, 1 220℃ and 1 240℃ respectively.