镍基耐蚀合金GH536B(G3)的高温变形特性

Hot Deformation Characteristics of Nickel Base Corrosion Resistant Alloy GH536B(G3)

通过Thermomacmaster-Z热模拟机试验和显微组织观察,研究了镍基耐蚀合金GH536B(G3,%:0.002C、20.30Cr、17.50Fe、8.70Mo、1.32W、1.90Cu、0.20Nb)1030～1300℃、应变速率1～25s^(-1)的应力-应变曲线以及温度对合金断面收缩率的影响,高温变形下合金组织的变化和应变速率对合金动态再结晶温度的影响。结果表明,G3合金变形抗力大,热成形温度区间小,随应变速率增大,热塑性降低;当Φ10 mm×140 mm试样拉伸速率为100 mm·s^(-1),合适的成形温度为1130～1260℃,当拉伸速率为200 mm·s^(-1),合适的成形温度为1130～1220℃。

The stress-strain curves of nickel base corrosion resistant alloy GH536B （G3： 0. 002C, 20. 30Cr, 17.50Fe, 8.70Mo, 1.32W, 1.90Cu, 0. 20Nb） with strain rate 1-25 s^-1 , at 1 030 - 1 300 ℃, the effect of temperature on reduction of area of alloy, the change of alloy structure with hot deformation and effect of strain rate on dynamic recrys- tallization temperature of alloy have been studied by Thermomacmaster-Z thermal simulation machine test and microstructure observation. Results showed that the G3 alloy had large resistance of deformation and narrow hot deformation temperature range, and with increasing strain rate, the hot ductility decreased such as for φ10 mm × 140 mm sample the tensile strain rate was 100 mm/s, the available temperature for deformation was 1 130 - 1 260 ℃ but as the tensile strain rate was 200 mm/s the available temperature for deformation was 1 130 - 1 220 ℃.