Microstructure and mechanical properties of linear friction welding joint of TC17 titanium alloy
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摘要: 针对固溶时效态TC17钛合金焊态及焊后热处理态线性摩擦焊接头，进行显微组织及力学性能对比分析. 结果表明，焊态时焊缝组织发生了回复与再结晶，由于焊后冷却速度较快，生成了亚稳定β相，焊缝区发生了软化；热力影响区组织沿受力变形方向拉长、细化、交替呈带状分布，加工硬化程度较高，显微硬度明显高于其它区域；热影响区由于二次次生α相基本溶解于亚稳定β相，导致显微硬度显著降低. 经过焊后热处理，亚稳定β相发生时效分解，析出了弥散程度更高的针状次生α相使得焊接区硬度大幅度提高. 由于亚稳定相的生成，焊态接头发生软化，拉伸均断裂在焊缝区，抗拉强度达到母材强度91.8%，断口呈脆性断裂形态；焊后热处理态接头由于二次次生α相的析出，起到弥散强化的作用，拉伸试验均断在母材，断口呈典型韧性断裂形态.Abstract: The microstructure and mechanical properties of as welded and post weld heat-treated linear friction welded joints of TC17 titanium alloy were compared and analyzed. The results show that the microstructure of the welded joint is recovered and recrystallized. Due to the rapid cooling rate after welding, metastable β phase is formed, and the weld zone is softened; the microstructure in the thermo mechanical affected zone is elongated and refined along the stress deformation direction The microhardness of the heat affected zone decreases significantly because the secondary α phase is dissolved in metastable β phase. After post weld heat treatment, metastable β phase decomposes in aging and precipitates acicular secondary α phase with higher dispersion, which greatly improves the hardness of welding zone. The results show that due to the formation of metastable phase, the welded joints soften, and the tensile strength is 91.8% of the base metal strength, and the fracture is brittle fracture; the joints in the post weld heat treatment state have the effect of dispersion strengthening due to the precipitation of secondary α phase, and the tensile tests are all broken in the base metal, and the fracture is in the typical ductile fracture morphology.
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图 9 焊态断口形貌
Figure 9. Fracture morphology of welded. (a) macro morphology of welded joint；(b) low power microstructure of A zone；(c) high power microstructure of A zone；(d) low power microstructure of B zone；(e) high power microstructure of B zone
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图 10 焊后热处理态断口形貌
Figure 10. Fracture morphology of PWHT. (a) macro morphology of PWHT joint；(b) low power microstructure of C zone；(c) high power microstructure of C zone
表 1 TC17钛合金化学成分(质量分数，%)
Table 1 Chemical composition of TC17 titanium alloy
Al Cr Mo Sn Zr Fe O Ti 5.43 4.26 3.99 2.07 1.95 0.117 0.112 余量 
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表 2 接头拉伸试验结果
Table 2 Tensile test results of joints
序号 试件状态 抗拉强度Rm/MPa 屈服强度R0.2/MPa 断后伸长率A(%) 1 焊态 1036.5 1035.6 0.2 2 焊态 1083.7 1073.5 1.2 3 焊后热处理 1157.5 1098.2 6.0 4 焊后热处理 1152.6 1089.6 5.7
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