Han Dong, Zhao Yongqing, Zeng Weidong
School of Materials, Northwestern Polytechnical University, Xi'an 710072, China.
Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China.
Materials (Basel). 2021 Feb 14;14(4):906. doi: 10.3390/ma14040906.
The present study focuses on the effect of 1% Zr addition on the microstructure, tensile properties and superplasticity of a forged SP700 alloy. The results demonstrated that Zr has a significant effect on inhibiting the microstructural segregation and increasing the volume fraction of β-phase in the forged SP700 alloy. After annealing at 820 °C for 1 h and aging at 500 °C for 6 h, the SP700 alloy with 1% Zr showed a completely globular and fine microstructure. The yield strength, ultimate tensile strength and tensile elongation of the alloy with optimized microstructure were 1185 MPa, 1296 MPa and 10%, respectively. The superplastic deformation was performed at 750 °C with an elongation of 1248%. The improvement of tensile properties and superplasticity of the forged SP700 alloy by Zr addition was mainly attributed to the uniform and fine globular microstructures.
本研究聚焦于添加1%Zr对锻造SP700合金的微观结构、拉伸性能和超塑性的影响。结果表明，Zr对抑制锻造SP700合金中的微观结构偏析和增加β相的体积分数具有显著作用。在820℃退火1小时并在500℃时效6小时后，添加1%Zr的SP700合金呈现出完全球状且细小的微观结构。具有优化微观结构的合金的屈服强度、极限抗拉强度和拉伸伸长率分别为1185MPa、1296MPa和10%。超塑性变形在750℃下进行，伸长率为1248%。添加Zr使锻造SP700合金的拉伸性能和超塑性得到改善，这主要归因于均匀且细小的球状微观结构。
