镍基Inconel-718合金TIG焊部分熔化区组织变化*

叶欣, 华学明, 王敏, 楼松年

MICROSTRUCTURE EVOLUTION OF PARTIALLY MELTED ZONE OF TIG WELDING JOINT OF Ni-BASED INCONEL-718 SUPERALLOY

YE Xin, HUA Xueming, WANG Min, LOU Songnian

表2 Inconel-718合金铸态与均匀化的母材和PMZ区域元素含量与理论固液相线温度

Table 2 Element contents and theoretical solidus and liquidus temperatures on as-cast and homogenization in base metal and PMZ zone for Inconel-718 superalloy

Type Zone Region Mass fraction /% Solidus Liquidus Fe Nb K K As-cast Base metal Laves 16.19 26.02 1391 1621 Segregated γ 17.30 8.17 1429 1586 Intradendriticγ 24.87 2.69 1553 1668 Homogenization Laves 12.12 27.62 1376 1635 Segregated γ 20.59 10.19 1423 1556 Intradendriticγ 25.21 4.87 1462 1631 As-cast PMZ Laves 21.54 26.30 1419 1625 Intradendriticγ 29.25 1.91 1593 1693 Homogenization Laves 21.50 24.86 1430 1600 Intradendriticγ 28.13 2.32 1572 1683