【摘要】：為實(shí)現(xiàn)鈦合金初生帶狀α相的球化,以具有這種組織的TA15鈦合金為對(duì)象,研究其在熱加工中的組織演變。結(jié)果表明:帶狀α相形態(tài)演變的機(jī)理與片層組織球化機(jī)理相同。由于帶狀α相尺寸較大,界面分離和末端物質(zhì)遷移機(jī)制較粗化更為重要。帶狀α相在退火中較為穩(wěn)定,主要原因是:內(nèi)部晶界的幾何取向不利于球化、帶狀組織的寬度較大和α粒子幾何穩(wěn)定性高。預(yù)變形和低速變形通過以下方式加速球化:直接改變?chǔ)料嗟膸缀涡螤�、通過增加大角度晶界以及相界的面積促進(jìn)界面分離和末端物質(zhì)遷移、通過形成位錯(cuò)結(jié)構(gòu)促進(jìn)粗化。采用大預(yù)變形結(jié)合高溫退火是球化帶狀α相的有效途徑。
[Abstract]:In order to realize the spheroidization of primary banded 偽 phase of titanium alloy, the microstructure evolution of TA15 titanium alloy with this kind of microstructure was studied. The results show that the morphologic evolution mechanism of banded 偽 phase is the same as that of lamellar spheroidization. Because of the larger size of the banded 偽 phase, the mechanism of interface separation and terminal material migration is more important than that of coarsening. The band 偽 phase is stable in annealing mainly because the geometric orientation of grain boundary is not conducive to spheroidization, the width of band structure is larger and the geometric stability of 偽 particles is high. Pre-deformation and low-velocity deformation accelerate spheroidization by directly changing the geometry of 偽 phase, by increasing the area of large angle grain boundary and phase boundary to promote interface separation and terminal material migration, and by forming dislocation structure to promote coarsening. Large predeformation combined with high temperature annealing is an effective approach for spheroidized zonal 偽 phase.
【作者單位】： 西北工業(yè)大學(xué)材料學(xué)院凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：Projects(51205317,51575449) supported by the National Natural Science Foundation of China Project(3102015AX004) supported by the Fundamental Research Funds for the Central Universities,China Project(104-QP-2014) supported by the Research Fund of the State Key Laboratory of Solidification Processing,China
【分類號(hào)】：TG146.23

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本文編號(hào)：2224082