高温长期时效对Waspaloy合金组织与性能的影响  

Effect of Long-Term Ageing on Structure and Properties of Waspaloy Alloy at High Temperature

作　　者：王煜 孙林根 于文龙 WANG Yu;SUN Lingen;YU Wenlong(Shanghai Electric Power Generation Equipment Co.,Ltd.Turbine Plant,Shanghai 200240,Chin)

机构地区：[1]上海电气电站设备有限公司汽轮机厂,上海200240

出　　处：《热力透平》2018年第1期29-33,共5页Thermal Turbine

摘　　要：采用了扫描电镜(SEM)、透射电镜(TEM)、拉伸以及冲击等试验方法,对标准热处理状态下的Waspaloy合金在700℃和750℃长期时效处理后的组织与力学性能进行了研究。结果表明:Waspaloy合金在700℃和750℃下长期时效后,γ′相平均颗粒尺寸与时效时间关系满足Ostwald方程。与标准热处理态试样相比,Waspaloy合金在700℃下长期时效后,室温屈服强度逐渐升高,时效1 000h后保持稳定;750℃下时效5 000h后试样的屈服强度稍微有所下降。两种温度长期时效后试样的室温延伸率和冲击功均呈现下降趋势。研究成果可为700℃汽轮机高温叶片的设计与使用提供参考。Microstructure and mechanical properties of Waspaloy alloy after long-term ageing at 700℃and 750℃were investigated by using SEM,TEM,tensile and impact testing after standard heat treatment.The results show that the relationship between coarsening behavior ofγ′and ageing time follows Ostwald equation after long-term ageing of Waspaloy alloy at 700℃and 750℃.Compared with the standard heat treatment sample,the yield strength at room temperature increased gradually after long-term ageing at 700℃and kept stable when the ageing time was more than 1 000 h,while the yield strength of sample aged at 750℃for 5 000 h slightly decreased.The room temperature elongation and impact values of samples after long-term ageing at two different temperatures showed decreasing trends.The research results can provide references for the design and application of steam turbine blades at 700℃.

关 键 词：WASPALOY 长期时效 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]