基于田口法的离心铸造TiAl合金环形件组织调控工艺参数优化  

Optimization of Centrifugally Casting Process Parameters for Microstructure Control in TiAl Alloy Ring Parts by Taguchi Method

作　　者：苏聪聪 黄刚 党乾 王晔[2] 刘国怀[1] SU Cong-cong;HUANG Gang;DANG Qian;WANG Ye;LIU Guo-huai(The State Key Laboratory of Rolling Technology and Continuous Rolling Automation,Northeastern University,Shenyang 110819,Liaoning,China;School of Material Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150008,Heilongjiang,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150008

出　　处：《铸造》2024年第10期1420-1428,共9页Foundry

摘　　要：为了获得TiAl合金环形件离心铸造过程中离心转速、浇注温度、浇注速度和模具预热温度对TiAl合金铸环凝固组织的影响规律,通过数值仿真和田口法,并利用晶粒尺寸和缩孔率的信噪比结果作为衡量铸件质量的指标,从而优化离心铸造工艺参数。试验结果表明:各工艺参数对晶粒尺寸影响因素大小依次为浇注速度、浇注温度、离心转速、铸型预热温度。各工艺参数对缩孔率影响因素大小则依次为浇注速度、离心转速、浇注温度、铸型预热温度。以晶粒细化程度最大、缩孔率最小作为优化目标时,最优工艺参数为离心转速600 r/min、浇注温度1620℃、浇注速度200 mm/s和型壳预热温度150℃。试验验证结果表明,该工艺参数制备出晶粒细小、组织致密的优质TiAl合金铸件。In order to obtain the influence of centrifugal speed,pouring temperature,pouring speed,and mold preheating temperature on the solidification microstructure of TiAl alloy ring castings during centrifugal casting,the centrifugal casting process parameters were optimized by numerical simulation and Taguchi method,and the signal-to-noise ratio results of grain size and shrinkage porosity were used as indicators to measure the quality of castings.The experimental results showed that the influencing factors of each process parameter on grain sizewere,in decreasing order,pouring speed,pouring temperature,centrifugal speed,and mold preheating temperature.The influence factors of the process parameters on the shrinkage porosity were pouring speed,centrifugal speed,pouring temperature,and mold preheating temperature,respectivly.With maximum grain refinement and minimum shrinkage as the optimization objectives,the optimal process parameters were centrifugal speed of 600 r/min,pouring temperature of 1620℃,pouring speed of 200 mm/s,and mold shell preheating temperature of 150℃.The experimental results showed that using these process parameters produced high-quality TiAl alloy castings with fine grains size and a dense microstructure.

关 键 词：离心铸造 TIAL合金 田口法 凝固组织 平均晶粒尺寸 缩孔率 

分 类 号：TG249.4[金属学及工艺—铸造] TG146.2[一般工业技术—材料科学与工程]