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TC18合金β相區(qū)等溫鍛造顯微組織和力學(xué)性能
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Microstructure and Mechanical Properties of β Isothermal Forged TC18 Alloy
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    摘要:

    研究了β相區(qū)等溫變形溫度、變形程度對(duì)TC18鈦合金顯微組織和力學(xué)性能的影響，討論了工藝、組織和性能之間的關(guān)系。結(jié)果表明，TC18合金顯微組織對(duì)等溫鍛造溫度的變化比較敏感，兩相區(qū)等溫鍛造和單相區(qū)等溫鍛造的顯微組織分別為雙態(tài)組織和網(wǎng)籃組織；與兩相區(qū)鍛造相比，β相區(qū)鍛造獲得了更高的強(qiáng)度和斷裂韌性，但塑性有所降低，且隨著變形溫度的升高，強(qiáng)度和塑性均呈現(xiàn)下降趨勢(shì)，斷裂韌性稍有升高。β相區(qū)變形量較小時(shí)，組織遺傳性導(dǎo)致合金保留了部分魏氏組織形貌，塑性較低，斷裂韌性較高；當(dāng)變形量達(dá)到60%時(shí)，晶粒破碎程度大，次生片狀α相發(fā)生一定程度球化并彌散分布，組織變得均勻細(xì)小，合金強(qiáng)度和塑性保持良好的匹配，斷裂韌性較高，綜合性能最好

    Abstract:

    The effects of deformation temperature and deformation degree on the microstructure and mechanical properties of TC18 titanium alloy during the β isothermal forging were studied. Results show that the microstructure of TC18 titanium alloy is sensitive to the variation of isothermal forging temperature. Deforming in (α+β)-phase gets a typical bi-modal microstructure while deforming in β-phase gets a net-shaped microstructure. When deforming above the β-transus temperature, the forging shows higher strength, fracture toughness and lower plasticity. With higher deformation temperature, both the strength and the plasticity decrease while the fracture toughness increases a little. Deforming above the β-transus temperature, typical Widmanstatten, coarse β grains, and the highest fracture toughness are obtained in small deformation degree. When the deformation degree reaches 60%, grains crack seriously, secondary lamellar α further globalize and disperse, and the microstructure becomes even fine, so the alloy’s strength and plasticity maintain good matching, fracture toughness is better and the best comprehensive properties are achieved

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張永強(qiáng),郭鴻鎮(zhèn),劉 瑞,王 濤,趙張龍,姚澤坤. TC18合金β相區(qū)等溫鍛造顯微組織和力學(xué)性能[J].稀有金屬材料與工程,2013,42(3):634~638.[Zhang Yongqiang, Guo Hongzhen, Liu Rui, Wang Tao, Zhao Zhanglong, Yao Zekun. Microstructure and Mechanical Properties of β Isothermal Forged TC18 Alloy[J]. Rare Metal Materials and Engineering,2013,42(3):634~638.]
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  • 收稿日期:2012-02-17
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