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TiZrNiCuBe塊體非晶合金激光焊接行為及溫度場數(shù)值模擬研究
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國家自然科學基金 (51205001)；安徽工程大學科研啟動基金 (2012YQQ006)


Laser Welding Behavior of TiZrNiCuBe Bulk Metallic Glass and Numerical Simulation of Temperature Fields
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    摘要:

    采用數(shù)值模擬研究了Ti40Zr25Ni3Cu12Be20塊體非晶合金激光焊接過程中的溫度場變化和冷卻速度變化規(guī)律, 分析了Ti基非晶合金在激光焊接過程中保持非晶態(tài)結構的機理。以高斯表面熱源和圓柱體熱源相結合的復合熱源模型作為焊接熱源, 考察了不同焊接參數(shù)下TiZrNiCuBe非晶合金在激光焊接過程中的熱歷史, 結合實驗結果分別對接頭焊縫區(qū)和熱影響區(qū)顯微組織變化進行了分析, 分別從加熱和冷卻兩階段給出非晶合金激光焊接接頭非晶相得以保持的理論解釋。完全非晶態(tài)接頭的顯微硬度測試表明: 熱影響區(qū)體現(xiàn)出較母材以及焊縫區(qū)更高的顯微硬度, 從玻璃轉變溫度、冷卻速度以及屈服強度三者之間關系的角度對該現(xiàn)象進行理論分析, 并通過實驗驗證分析的準確性

    Abstract:

    Laws for temperature fields and cooling rate during laser welding have been studied by numerical simulations, in order to explore the mechanism of successful laser welding of the Ti40Zr25Ni3Cu12Be20 bulk metallic glass (BMG). Taking the effect of convection and radiation on heat transfer into account, the thermophysical properties were detected as a function of temperature. Heat source model with the cylinder and Gaussian was selected. Based on the model, the temperature fields of the Ti-based BMG at different welding parameters were calculated. Combined with the results of experiment and simulation, the microstructures from welded zone and heat affected zone have been analyzed. The mechanism of successful laser welding of Ti40Zr25Ni3Cu12Be20 BMG has been discussed from heating process and cooling process. The results obtained from the microhardness tests of completely amorphous joint indicate that the heat affected zone (HAZ) has higher hardness than those of the parent metal and weld zone (WZ). The phenomenon was studied theoretically from the relationship of glass transition temperature, cooling rate and yield strength. The experiment was also done to validate the accuracy of the analysis

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王 剛,黃永江,沈 軍,黃仲佳. TiZrNiCuBe塊體非晶合金激光焊接行為及溫度場數(shù)值模擬研究[J].稀有金屬材料與工程,2014,43(11):2713~2718.[Wang Gang, Huang Yongjiang, Shen Jun, Huang Zhongjia. Laser Welding Behavior of TiZrNiCuBe Bulk Metallic Glass and Numerical Simulation of Temperature Fields[J]. Rare Metal Materials and Engineering,2014,43(11):2713~2718.]
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  • 收稿日期:2013-11-05
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  • 在線發(fā)布日期: 2015-04-07
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