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Ti6Al4V激光焊接接頭非均勻梯度特征研究現(xiàn)狀
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國家自然科學(xué)基金 (50875200)和國家教育部博士點(diǎn)基金項(xiàng)目 (20100201110065)


State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
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    摘要:

    Ti6Al4V鈦合金在激光焊接過程中，由于熱源密度高，在焊縫及其附近的狹窄區(qū)域形成了極大的溫度梯度，并導(dǎo)致焊接接頭形成大梯度的組織性能和殘余應(yīng)力。基于國內(nèi)外的文獻(xiàn)，綜合研究了鈦合金激光焊溫度、接頭組織、顯微性能與殘余應(yīng)力的非均勻梯度特征。研究表明，對于焊接接頭大梯度特征的研究，主要集中在分析組織、性能和殘余應(yīng)力的不均勻性方面，而未對梯度特征做出定量分析與評價(jià)。因此，如何對焊后組織性能和殘余應(yīng)力的梯度特征進(jìn)行有效直觀的量化表征，對于激光焊接接頭的整體性能及安全評價(jià)有著重要的意義

    Abstract:

    During the process of laser welding for Ti6Al4V alloy, there is large temperature gradient in the weld and the narrow area nearby because of high heat source density, which causes a large gradient of microstructure, properties and residual stress across welded joint. Based on the domestic and foreign literatures, this paper synthetically researches the heterogeneous gradient features of temperature, microstructure, mechanical properties and residual stress of titanium alloy with laser welding. The results show that the studies for large gradient features of welded joint mainly focus on the heterogeneity analysis but not on quantitative analysis and evaluation. Therefore, the method of making a quantitative characterization efficiently and intuitively for the gradient of microstructure, properties and residual stress after welding is very significant for evaluation of overall performance and safety of laser welded joints.

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董麗娜,張建勛. Ti6Al4V激光焊接接頭非均勻梯度特征研究現(xiàn)狀[J].稀有金屬材料與工程,2013,42(3):655~660.[Dong Lina, Zhang Jianxun. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China[J]. Rare Metal Materials and Engineering,2013,42(3):655~660.]
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  • 收稿日期:2012-03-01
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