一种新型第三代单晶高温合金WZ30组织与性能的研究

Microstructure and Properties of Third Generation Single Crystal Superalloy WZ30

通过热力学计算和实验验证优化了W、Mo、Co、Cr、Al、Ta等元素在单晶高温合金中的含量,设计了Re含量为5wt%的新型单晶高温合金WZ30,并与典型二代、三代单晶高温合金进行了比较。结果表明,WZ30经热处理后获得均匀的γ′相显微组织,在760、980和1100℃下WZ30的屈服强度分别为938、639和436 MPa,温度高于1000℃时拉伸性能优于二代单晶高温合金。在980℃,250 MPa和1100℃,137 MPa实验条件下,WZ30的持久寿命分别为642和254 h,持久寿命明显优于二代单晶高温合金。WZ30的低周疲劳寿命在980℃下明显优于二代单晶高温合金DD6。在高温长时间循环氧化实验中,WZ30显示出较好的抗氧化性和组织稳定性。

The content of W,Mo,Co,Cr,Al,Ta and other elements in the single crystal superalloy was optimized through experimental data and thermodynamic calculations.A new third-generation single crystal superalloy WZ30 with Re content of 5 wt%was designed.The metallographic and mechanical properties of WZ30 were studied and analyzed,and the WZ30 alloy was compared with existing second-generation and third-generation single crystal superalloys.The results show that WZ30 has uniform microstructure after heat treatment.The yield strengths of WZ30 are 938,639 and 436 MPa at 760,980 and 1100℃,respectively.When the temperature is higher than 1000℃,the tensile performance of WZ30 is better than that of the second-generation single crystal superalloy.The creep rupture life of WZ30 is 642 h at 980℃,250 MPa and 254 h at 1100℃,137 MPa,which is significantly better than that of the second-generation single crystal superalloys.The low cycle fatigue life of WZ30 is better than that of the second-generation single crystal superalloy DD6 at 980℃.WZ30 alloy has better oxidation resistance and structural stability in high temperature cyclic oxidation experiments.