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TC4鈦合金CO2激光深熔焊接頭非線性損傷研究
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國家自然科學(xué)基金 (50875200)；國家教育部博士點基金 (20100201110065)


Study on Nonlinear Damage Evolution of CO2 Laser Deep Penetration Welded Joint for TC4 Titanium Alloy
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    摘要:

    針對TC4鈦合金CO2激光深熔焊接接頭具有組織性能非線性大梯度特征，并對其塑性損傷行為產(chǎn)生影響的科學(xué)問題，采用多試樣拉伸試驗法研究其非線性塑性損傷行為，提出采用金相法檢測的微孔洞體積分?jǐn)?shù)以表征塑性損傷程度。結(jié)果表明：TC4鈦合金激光深熔焊接頭的塑性損傷過程表現(xiàn)為微孔洞的產(chǎn)生與聚合；微孔洞體積分?jǐn)?shù)沿焊接接頭從焊縫、熱影響區(qū)(HAZ)至母材呈非線性分布；激光焊接接頭的焊縫、HAZ和母材的微孔洞長大規(guī)律和施加應(yīng)力與顯微組織有關(guān)，在應(yīng)力較小時，粗大的晶粒尺寸使得焊縫損傷大于HAZ損傷，而在應(yīng)力較大時，晶內(nèi)微孔洞使得HAZ損傷大于焊縫；而且隨著施加應(yīng)力的增大，HAZ中的微孔洞體積分?jǐn)?shù)增長速度比焊縫快

    Abstract:

    In order to understand the effects of nonlinear microstructures on the damage evolution in laser welded joint of titanium alloy, a multi-specimen method with volume fraction of microvoids was applied to estimate the damage evolution for TC4 titanium alloy. The results show that there are great nonlinear gradient distributions of the microstructure morphology in TC4 laser deep penetration welded joints from weld metal, HAZ to base metal, the damage performance and mechanism change according to these gradient characters, the damage mechanism presents the pattern of microvoids-polymerization, and the volume fraction of microvoids has a great gradient distribution which increases faster in the base metal near welding HAZ than in the weld metal as the load increasing.

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張建勛,宋 旭,鄭 莉. TC4鈦合金CO2激光深熔焊接頭非線性損傷研究[J].稀有金屬材料與工程,2012,41(4):607~611.[Zhang Jianxun, Song Xu, Zheng Li. Study on Nonlinear Damage Evolution of CO2 Laser Deep Penetration Welded Joint for TC4 Titanium Alloy[J]. Rare Metal Materials and Engineering,2012,41(4):607~611.]
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  • 收稿日期:2011-04-10
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