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等通道轉(zhuǎn)角擠壓工藝對(duì)TA15合金顯微硬度的影響
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Effects of Equal Channel Angular Pressing on Microhardness of TA15 Alloy
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    摘要:

    研究近α鈦合金TA15經(jīng)等通道轉(zhuǎn)角擠壓工藝（ECAP）加工后的維氏顯微硬度及其變化規(guī)律。結(jié)果表明：TA15合金經(jīng)ECAP擠壓后，顯微硬度顯著提高，且合金試樣外層硬度略高于芯部。合金的顯微硬度與組織畸變程度、位錯(cuò)密度、晶粒尺寸以及相組成等密切相關(guān)。相變點(diǎn)以下擠壓，擠壓溫度越低，硬度越高；相變點(diǎn)以上擠壓，由于擠壓后水冷過(guò)程中在β相內(nèi)產(chǎn)生針狀馬氏體α′，硬度明顯高于相變點(diǎn)以下擠壓。模具轉(zhuǎn)角越小，顯微硬度越高。隨擠壓次數(shù)增加，硬度先增大后保持基本不變，而擠壓路徑對(duì)硬度的影響與擠壓次數(shù)、擠壓后細(xì)化效果密切相關(guān)。TA15合金經(jīng)ECAP后退火，顯微硬度明顯降低

    Abstract:

    Vickers microhardness of TA15 titanium alloy after equal channel angular pressing (ECAP) and its variation was investigated. The results indicate that the microhardness is increased observably after ECAP, and the microhardness level of the outer layer is slightly higher than that of the core in the same cylinder sample. The microhardness of ECAPed alloy is closely related to microstructure distortion, dislocation density, grain size and phase composition. There is a decrease in microhardness with the increasing pressing temperature below Tβ. As a result of the acicular martensite precipitation, the microhardness after ECAP above Tβ is much higher than that below Tβ. A lower die angle means a better hardness. The microhardness increases first and then remains at a certain level with the increasing passes, while the route effects on hardness are related to the pass number and the refinement effects. The annealing after ECAP can effectively reduce the microhardness

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趙 嚴(yán),郭鴻鎮(zhèn),王 濤,譚立軍,姚澤坤.等通道轉(zhuǎn)角擠壓工藝對(duì)TA15合金顯微硬度的影響[J].稀有金屬材料與工程,2011,40(5):885~888.[Zhao Yan, Guo Hongzhen, Wang Tao, Tan Lijun, Yao Zekun. Effects of Equal Channel Angular Pressing on Microhardness of TA15 Alloy[J]. Rare Metal Materials and Engineering,2011,40(5):885~888.]
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  • 收稿日期:2010-05-18
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