K17铸造镍基高温合金热等静压后热处理的研讨

RESEARCH ON POST-HIP HEAT TREATMENT OF K17 CAST NIKEL-BASE SUPERALLOY

本文研究了热等静压(HIP)后热处理对 K17铸造镍基高温合金的显微组织与力学性能的影响。若热处理参数选择恰当,则热处理能提高抗拉强度与持久性能。然而,随着阻碍晶界裂纹扩展颗粒的减少及共晶附近裂纹源的出现,可导致塑性的下降。文中还论述了合金的抗氧化性能及合金元素(Cr、Co、Mo、Ti 等)的扩散均匀化等问题。

This paper describes the investigation on the effects of post-hot isostatic pressing (HIP)heat treatment on the microstructure and mechanical properties of K17 cast nickel-base super-alloy.Post-HIP heat treatment may improve tensile and rupture properties of K17 superalloy,if the post-HIP heat treatment parameters are appropriate.The duc(?)ility of K17 superalloy maybe reduced,if the particles which resist expansion of grain boundary cracking decrease and cr-acking sources of neighboring eutectic nodules appeare.The resistance to high temperature oxi-dation and the diffusion of alloying elements (Cr,Co,Mo,Ti etc) are also discussed.