K-32合金是一种无钴铁镍基析出硬化型铸造高温合金,是在GH302变形合金的基础上调整C、B含量发展而成,具有较高的机械性能,较好的工艺性,在700℃以下使用合金性能较为稳定。该合金目前已应用于电站燃汽轮机涡轮铸造静叶片及柴油机涡轮增压器叶轮,获得满意效果。本文叙述了K-32合金的成份、组织和性能,特别是合金的长期组织稳定性和性能的变化规律。 K-32 alloy is a cobalt-free iron-nickel-based precipitation hardening cast-type superalloy, which is based on GH302 deformation alloy C, B content developed, with high mechanical properties, good processability, in the 700 ℃ below the use of alloy performance is more stable. The alloy has been applied to power station steam turbine turbine casting turbine blades and turbocharger impeller, with satisfactory results. This paper describes the composition, microstructure and properties of K-32 alloy, especially the long-term microstructure and properties of alloys.