论文部分内容阅读
初步研究了拉应力和合金成分对Ti811合金棒材热盐应力腐蚀(HSSC)性能的影响。结果表明:Al含量小于8.0wt%时,Al、Mo、V含量的变化对合金HSSC性能无明显影响;Al含量大于8.0wt%,随Al含量升高,HSSC性能明显下降,而Mo、V含量可改善其性能;当拉应力由147MPa升高到196MPa,HSSC性能明显降低。在实验基础上,提出了HSSC断裂模型,盐蚀区有Cl-,Na+等存在,产生微裂纹,裂纹沿原β晶界扩展,最终导致断裂。
The effects of tensile stress and alloy composition on the properties of hot salt stress corrosion cracking (HSSC) of Ti811 alloy rod were studied preliminarily. The results show that the Al, Mo and V content have no significant effect on the properties of HSSC. When the content of Al is more than 8.0wt%, the properties of HSSC decrease obviously with the increase of Al content. However, V content can improve its performance; when the tensile stress increased from 147MPa to 196MPa, HSSC performance decreased significantly. Based on the experiment, the HSSC fracture model is proposed. Cl- and Na + exist in the salt eroded zone, and microcracks are generated. The crack propagates along the original β grain boundary and eventually leads to fracture.