2 m级大尺寸高温合金机匣精密成形工艺研究

目的 为满足某型号燃气轮机用2 m级大尺寸高温合金机匣整体精密成形的要求,在保证组织与性能均匀性的同时,进一步提高材料利用率.方法 通过数值模拟优化环件精密成形工艺,对制坯及环轧过程的热力参数进行分析,并将其与组织性能结果进行对比.结果 通过胎膜制坯+异形环轧成形大尺寸高温合金环锻件,锻件成形完整,热力参数分布均匀,显...

Precision Forming Technology for Superalloy Casing with 2-meter Diameter

The work aims to improve the material utilization on the premise of ensuring microstructure and property uniformity to meet the requirement on precision forming of 2-meter diameter superalloy casing used for gas turbine. The precision forming process of rings was optimized by numerical simulation. The thermal mechanical parameters during the blank forging and ring rolling process were analyzed and compared with the result of microstructure and properties. The results showed that the large-size superalloy ring forgings formed by membrane blank forging+special-shaped ring blank rolling were complete. Thermal mechanical parameters, microstructure and properties were distributed uniformly. FEM simulation can effectively predict the thermal parameters of ring forming process. Rationality and feasibility of the process can be accurately judged by the relationship between thermal parameters, microstructure and properties. Microstructure and properties of superalloy are sensitive to the hot working process. Obvious temperature rise and only heating process without deformation should be avoided during hot working of superalloy.