Fatigue and microstructural properties of quenched Ti- 6Al- 4V
Fatigue and microstructural properties of quenched Ti- 6Al- 4V
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淬火Ti-6Al-4V的疲劳和显微组织性能
DOI：
10.1007/bf02651620
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
A. Fraker
中科院分区：
文献类型：
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作者：
C. M. Gilmore;MA Imam;M. Sugano;K. M. Speck;A. Fraker
对Ti-6A1-4V试样在843℃~ 1065℃温度下热处理10 min，水淬后的力学性能和显微组织进行了测定；这些性能与α-β退火试样的性能进行了比较。900℃热处理和水淬试样的疲劳寿命是其他处理的4 ~ 10倍；此外，这种处理导致高延展性，屈服强度，抗拉强度和弹性模量。利用光学显微镜和透射显微镜进行的显微组织研究表明，疲劳寿命的提高是由应变诱导的残余β向马氏体转变的结果。β的保留量及其相对稳定性与热处理温度有关。热处理温度越低，淬火前β相含量越少，稳定剂中β相含量越丰富。β相中稳定剂浓度越大，β相保留的可能性越大。高热处理温度导致大量β不稳定，更容易在水淬过程中转变为马氏体。
The mechanical properties and microstructures of Ti-6A1-4V were determined for specimens heat treated at temperatures from 843 °C to 1065 °C for 10 minutes and water quenched; these properties were compared with those of α-βannealed specimens. Specimens heat treated at 900 °C and water quenched had higher fatigue lives by a factor of four to ten relative to the other treatments; in addition, this treatment resulted in high ductility, yield strength, tensile strength, and elastic modulus. Micro-structure studies utilizing optical and transmission microscopy showed that the improved fatigue lives were a result of a strain induced transformation of retained β to martensite. The amount of retainedβand its relative stability were shown to depend upon the heat treatment temperature. The lower the heat treatment temperature below theβtransus the smaller the amount ofβphase present before the quench and the richer theβphase inβstabilizer. The greater the concentration ofβstabilizer in theβphase the greater the probability that theβphase was retained. High heat treatment temperatures resulted in a greater amount ofβthat was less stable and more probable to transform to martensite during a water quench.