热处理对TC17(α+β)/TC17(β)线性摩擦焊接头组织及力学性能的影响
Influence of heat treatment on microstructure and mechanical properties of TC17(α+β)/TC17(β) linear friction welding joint
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摘要: 针对热处理前后TC17(α+β)/TC17(β)钛合金线性摩擦焊接头组织和性能进行了对比分析. 结果表明,焊态时焊缝区组织发生动态回复和再结晶，两侧的热力影响区组织均被不同程度地拉长，热处理后焊缝中的亚稳相分解析出弥散的α和β相，TC17(α+β)侧热力影响区的初生α相有所长大. 焊态接头焊缝区显微硬度比母材低，接头的抗拉强度和屈服强度略低于母材，分别达到母材的91.9%,96.2%，接头拉伸性能试件断裂位置均在焊缝区；经过热处理，母材显微硬度未发生明显变化，焊缝区显微硬度显著提高，接头抗拉强度和屈服强度达到与母材相当，与焊态相比分别提高11.9%,8.2%，接头拉伸性能试件断于母材区.Abstract: The influence of heat treatment on microstructure and mechanical properties of TC17(α+β)/TC17(β) linear friction welded joints were studied. The results show that dynamic recovery and dynamic recrystallization had occurred in the weld. The microstructure of thermomechanically affected zone was stretched at varying degrees. After heat treatment the metastable phase of the weld precipitated dispersive phase and phase, and the primary phase of TC17(α+β) heat affected zone microstructure growed. The microhardness of welded joints is lower than that of base metal. The tensile strength and yield strength of the as welded joints reached 91.9% and 96.2% of that of base metal respectively. And the fracture position of the tensile specimen were at weld zone .After heat treatment，the hardness of base metal did not change significantly, and the microhardness of the joint was significantly increased. The tensile strength and the yield strength of the joints were equivalent to that of the base metal, and increased 11.9% and 8.2% when compared to that of the as welded joints.And the fracture position of the tensile specimen were in the base metal.
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