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β轉(zhuǎn)變組織TA15鈦合金塑性流動失穩(wěn)行為研究
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南昌航空大學,南昌航空大學,南昌航空大學,南昌航空大學

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國家自然科學基金資助(項目號51261020)；航空科學基金資助(項目號2014ZE56015)；江西省教育廳科學技術(shù)項目資助(項目號GJJ150734)


Study of the Plascticity Flow Instability Behavior of TA15 Tiatanium Alloy with Beta Transformed Microstructure
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Nanchang Hangkong University,Nanchang Hangkong University,Nanchang Hangkong University,Nanchang Hangkong University

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    摘要:

    本文采用THERMECMASTOR-Z型熱模擬實驗機對魏氏和網(wǎng)籃兩種β轉(zhuǎn)變組織TA15鈦合金在溫度750℃-950℃、應(yīng)變 速率0.001s-1-10s-1范圍進行等溫恒應(yīng)變速率壓縮實驗。實驗結(jié)果表明，兩種β轉(zhuǎn)變組織鈦合金在低溫（750℃-880℃）和高應(yīng) 變速率（0.0032s-1-10s-1）范圍存在較大區(qū)域的塑性流動失穩(wěn)，且魏氏組織的塑性流動失穩(wěn)范圍更大，在溫度750℃-775℃、應(yīng)變 速率0.001s-1-0.0032s-1和溫度880℃-950℃、應(yīng)變速率0.56s-1-10s-1區(qū)域也出現(xiàn)了塑性流動失穩(wěn)。魏氏組織的塑性流動失穩(wěn)缺陷 主要有45°宏觀剪切裂紋、微裂紋和局部流動帶三種，網(wǎng)籃組織的失穩(wěn)缺陷主要有45°宏觀剪切裂紋和局部流動帶兩種。魏氏組織比網(wǎng)籃組織更容易發(fā)生塑性流動失穩(wěn)與網(wǎng)籃組織組織更均勻，在變形過程中協(xié)調(diào)分散性好，不利于產(chǎn)生應(yīng)力集中有關(guān)。

    Abstract:

    Isothermal constant strain rate compression tests of TA15 titanium alloy with basket-weave and Widmannstatten two types of beta transformed microstructurehave been carried out in the temperature range of 750℃-950℃ and strain rate of 0.001s-1-10s-1. The results show that there is a wide range of plastic flow instabilitySof the two beta transformed microstructure at low temperature and high strain rate region (750℃-880℃,0.0032s-1-10s-1).The instability range of Widmannstatten microstructure is larger than that of basket-weave. In the range of 750℃-775℃,0.001s-1-0.0032s-1 and 880℃-950℃,0.56s-1-10s-1 the Widmannstatten microstructure also have plastic flow instability defects.The instability defects of Widmannstatten microstructure have 45° macro shear crack, flow localization band and microcrack. The basket-weave microstructure has 45° macro shear crack and flow localization defects. The plastic flow instability is more likely to happen in Widmannstatten than basket-weave microstructure is primary cause of the difference of the initial alpha lamellar thickness in two beta transformed microstructure.

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董顯娟,魯世強,王克魯,歐陽德來.β轉(zhuǎn)變組織TA15鈦合金塑性流動失穩(wěn)行為研究[J].稀有金屬材料與工程,2018,47(5):1485~1491.[Dong Xianjuan, Lu Shiqiang, Wang Kelu, Ouyang Delai. Study of the Plascticity Flow Instability Behavior of TA15 Tiatanium Alloy with Beta Transformed Microstructure[J]. Rare Metal Materials and Engineering,2018,47(5):1485~1491.]
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  • 收稿日期:2016-04-28
  • 最后修改日期:2016-07-25
  • 錄用日期:2016-08-18
  • 在線發(fā)布日期: 2018-06-08
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