Decrease of the Strength due to Delayed Quenching in Ti-6%Al-4%V Alloy and Its Mechanism
Decrease of the Strength due to Delayed Quenching in Ti-6%Al-4%V Alloy and Its Mechanism
复制标题
降低%20of%20the%20强度%20due%20to%20延迟%20淬火%20in%20Ti-6%Al-4%V%20Alloy%20and%20Its%20机制
DOI：
10.2355/tetsutohagane1955.72.1_131
复制
发表时间：
1986
影响因子：
0.3
通讯作者：
C. Ouchi
中科院分区：
文献类型：
--
作者：
H. Suenaga;C. Ouchi
概要：研究了延迟淬火对Ti-6%A1-4%V合金强度的影响，并通过对显微组织变化的定量分析，探讨了延迟淬火对Ti-6%A1-4%V合金强度的影响机理。强度随延迟时间的显著降低是a+fl两相区热处理所特有的现象，其敏感性与合金的化学成分有关。随着淬火延迟时间的延长，组织变化依次为初生α相粗化、13相基体中针状α相的形成、横向粗化和针状α相数量的增加。这些微观结构的变化是非常相似的淬火微观结构的变化，由于在这种合金淬火的质量效应。采用考虑初生α相晶粒尺寸的两相组织混合规律，可以很好地分析延迟淬火钢板时效后的强度。延迟淬火的敏感性主要受淬火再加热温度下β相的稳定性控制，即通过增加V等β I稳定元素的含量来控制。
Synopsis : The effect of delayed quenching on the strength of Ti-6%A1-4%V alloy was studied, and the mechanism of strength deterioration with delay time of quenching was investigated based on the quantitative analysis of the microstructural changes. The marked reduction of strength with delay time was a phenomenon peculiar to heat treatment in a+fl two phase region, and its susceptibility depended on the chemical composition of the alloy. The microstructural changes taken place with the extension of delay time of quenching were coarsening of primary a phase, formation of acicular a phase in 13 phase matrix, and lateral coarsening and the increase of the number of acicular a phase, in turn. These microstructural changes were very similar to variations in the quenched microstructure due to the mass effect of quenching in this alloy. The strength after aging in the delayed quenched plates could be analyzed with an excellent accuracy by the mixed law of two phase structures which was taken account of grain size in primary a phase. The susceptibility of delayed quenching was controlled by stability of /3 phase at the reheating temperature of quenching, that is, by the increase of the content of /I-stabilizing elements such as V.