摘要
本文主要研究不同Si含量对7715C钛合金的组织及性能的影响。通过对不同Si含量对室温拉伸、室温缺口拉伸、冲击、540℃高温拉伸及热稳定性影响的观察分析,得知在7715C合金中的最佳Si含量为0.2％。在此Si含量下综合性能最好,当Si含量高于或低于0.2％时,上述性能均有所下降。不同Si含量合金经540℃/不同时间热暴露后发现最佳峰值随热暴露时间的延长而左移,热暴露100h后峰值在Si含量为0.3％左右,而热暴露200h后,峰值左移至Si含量为0.2％。从组织的变化来看,合金中Si的最佳含量以在热加工温度下保持最大固溶度不析出硅化物为宜。硅化物的析出随着热暴露时间的延长及Si含量在合金中的提高而逐渐增多,故使峰值随热暴露时间的延长而左移。
The effects of Si content on the microstructure and machanical properties such as room temperature tensile strength, room temperature tensile strength with notch, 541℃ tensile strength, impact toughness and thermal stability of 7715C alloy have been investigated in this paper. The results show that there exists an optimum Si content of 0.2wt% where the best combination of the above properties is obtained. The relation between Si content and the peak value of alloys after a period′s exposure at 540℃ shows that the longer the alloys were exposured, the less Si content corresponds to the peak value. Peak values are found for 0.3 wt% Si alloy after 100 hours exposured and for 0.2 wt% Si after 200 hours exposured, respectively. Examination of the microstructure illustrates that the optimum Si content is the maximun solution content of Si in the alloy when no Si compounds formed. As more Si compounds precipitate with increasing in Si content and exposure time, the Si content of alloy with peak value moves to the left, i.e., less Si content, when the exposuring time is extended.
出处
《航空材料学报》
EI
CAS
CSCD
1990年第2期7-12,共6页
Journal of Aeronautical Materials
