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10 mm厚TC11鈦合金電子束焊接組織性能和殘余應力
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Microstructure, Mechanical Properties and Residual Stress of Electron Beam Welded TC11 Alloy Joint of 10 mm Thickness
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    摘要:

    利用真空電子束焊機對TC11鈦合金進行試驗研究。采用光學顯微鏡及掃描電鏡觀察并分析接頭不同區(qū)域的組織特征，并對焊接接頭進行了顯微硬度和力學性能測試，同時采用盲孔法對試樣的殘余應力進行測試。結(jié)果表明：TC11鈦合金電子束焊接頭焊縫區(qū)的組織特征為典型的柱狀晶，晶粒內(nèi)為交錯排列細密的α′相，而熱影響區(qū)組織為均勻的α′相和原始α+β轉(zhuǎn)相的混合物。顯微硬度與組織呈現(xiàn)較好的對應關(guān)系，即焊縫及熱影響區(qū)的顯微硬度高于母材。接頭的沖擊韌性比母材提高了20%，而抗拉強度為母材的98%左右。殘余應力為以縱向應力為主的單向拉伸應力狀態(tài)，橫向殘余應力數(shù)值則較小。

    Abstract:

    Electron beam welding of TC11 alloy was carried out to study the microstructure, mechanical properties and residual stress of the joint. In the fusion zone, typical columnar crystals with fine martensite α′ are found, in contrast with the heat affected zone where equiaxed α and martensite α′ are dispersed in the transformed β. The microhardness of the fusion zone is higher than that of the heat affected zone and the base metal. The joint impact toughness is increased by 20%, while the tensile strength remains invariable compared to the base metal. Longitudinal and transverse stresses are tensile, while the transverse stress is smaller than the longitudinal stress.

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王世清,劉金合,溫國棟,姜玉恒,馬正斌.10 mm厚TC11鈦合金電子束焊接組織性能和殘余應力[J].稀有金屬材料與工程,2013,42(6):1150~1153.[Wang Shiqing, Liu Jinhe, Wen Guodong, Jiang Yuheng, Ma Zhengbin. Microstructure, Mechanical Properties and Residual Stress of Electron Beam Welded TC11 Alloy Joint of 10 mm Thickness[J]. Rare Metal Materials and Engineering,2013,42(6):1150~1153.]
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  • 收稿日期:2012-06-20
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