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退火溫度對TC4鈦合金動態(tài)斷裂韌性的影響
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Effects of Annealing Temperature on Dynamic Fracture Toughness for TC4 Titanium Alloy
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    摘要:

    采用示波沖擊法，對750 ℃、相變點以下(20~60) ℃、相變點以上10 ℃等7種不同熱處理狀態(tài)TC4鈦合金的動態(tài)斷裂韌性進行了測試，結(jié)合金相組織觀察及掃描電鏡斷口形貌觀察，分析了初生α相含量及次生α相形貌對TC4鈦合金動態(tài)斷裂韌性的影響。結(jié)果表明，對于初生α+β轉(zhuǎn)變組織的TC4合金，初生α相含量在47%~50%范圍，次生α相片層呈短棒狀，具備上述特征的合金在本研究涉及的加載速率范圍內(nèi)具有較好的動態(tài)斷裂性能。

    Abstract:

    The dynamic fracture toughness of TC4 titanium alloy in 7 heat-treatment conditions, such as 750 oC, (20-60) oC lower than or 10 oC higher than the phase transformation temperature, was tested by means of instrumented impact method. Combined with both metallography and fractographs, the influence of volume of primary α phase and ratio of length/width for secondary α phase was studied. Results show that the volume of primary α phase in 47%-50% with short rod-like secondary α phase leads to relatively good dynamic fracture toughness for TC4 titanium alloy with (primary α+βTrans) microstructure under the dynamic loading condition.

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劉 睿,惠松驍,葉文君,熊柏青,尤振平.退火溫度對TC4鈦合金動態(tài)斷裂韌性的影響[J].稀有金屬材料與工程,2011,40(10):1799~1803.[Liu Rui, Hui Songxiao, Ye Wenjun, Xiong Baiqing, You Zhenping. Effects of Annealing Temperature on Dynamic Fracture Toughness for TC4 Titanium Alloy[J]. Rare Metal Materials and Engineering,2011,40(10):1799~1803.]
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  • 收稿日期:2010-10-25
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