大尺寸定向柱晶空心透平叶片材料DZ411G热力学分析-中国材料进展

文章信息/Info

Title:: Thermodynamic Analysis of Large-Size Oriented Cylindrical Hollow Turbine Blade Material DZ411G

Author(s):: DENG Rui; WEN Xinli; ZHANG Chaolei; 1.Beijing Beiye Functional Materials Corporation, Beijing 100192, China； 2. Beijing CTKM Harmonic Drive Co., Ltd., Beijing 100083, China

Keywords:: large size; oriented cylindrical; hollow turbine blade; DZ411G; thermodynamic calculation

摘要:: 高温合金由于其优异的综合高温性能被应用于航空发动机、燃气轮机等热端部件的制造，随着装备设计对材料服役温度要求的日益提高，对高温合金的综合性能要求越来越严苛，具有更加优异性能的改型合金不断诞生。以我国某新型重型燃气轮机大尺寸定向柱晶空心透平叶片用改型合金DZ411G为研究对象，借助相图计算软件JmatPro，通过热力学计算分析了C，Al，Ti，Cr，Ta等元素对主要合金相的开始析出温度、最大析出量、固液相线、γ/γ′错配度等的影响规律，为DZ411G合金化学成分优化、熔炼配入点设计及热处理工艺制定提供了依据。根据理论计算结果，设计了合理的配入点，并首次完成了2.5 t DZ411G母合金的工业化生产。

Abstract:: High temperature alloy due to its excellent comprehensive high temperature performance is used in the manufacture of hot end parts of aircraft engines, gas turbines, etc., with the increasing requirements of equipment design for material service temperature, the comprehensive performance requirements of high temperature alloys are becoming more and more stringent, and modified alloys with better performance are constantly born. Taking the modified alloy DZ411G for largesize oriented cylindrical hollow blades of a new type of heavy-duty gas turbine in China as the research object, this paper analyzed the influence of C, Al, Ti, Cr, Ta and other elements on the initial precipitation temperature, maximum precipitation amount, solid-liquid phase line, γ/γ′ mismatch degree of the main alloy phases with the help of phase diagram calculation software JmatPro, and provided a basis for the optimization of chemical composition of DZ411G alloy, the design of smelting inlet point and the formulation of heat treatment process. According to the theoretical calculation results, a reasonable formula was formulated, and the industrial production of DZ411G alloy was completed for the first time.