Title: Microstructure and Properties of Ti-5111 Alloy Plate used in Marine Environments
文章编号: 1009-9964(2020)-37-4-003
作者: 席锦会，葛鹏，侯鹏，廖强
(西部金属材料股份有限公司，陕西西安710201)
Author(s): Xi Jinhui，Ge Peng，Hou Peng，Liao Qiang
（Westen Metal Materials Co., Ltd.，Xi’an 710201，China）
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摘要: 以经过两相区轧制得到的25 mm厚Ti-5111合金板材为研究对象，研究了不同热处理制度下板材的显微组织和力学性能。研究发现，800 ℃热处理后的组织为等轴组织，950 ℃热处理后的组织为双态组织，1 000 ℃热处理后为魏氏体组织。950 ℃热处理后板材综合性能最好，其Rm=870 MPa，Rp0.2=775 MPa，A=14%，AKV=81 J。分析了不同热处理温度下Ti-5111合金冲击试样的断口形貌，并分析了影响材料韧性的因素，发现Ti-5111合金板材的冲击韧性与组织类型有关，双态组织的冲击韧性最好，魏氏体组织的次之，等轴组织最差。板材焊缝的力学性能与母材相当，表现出优异的焊接性能。
Abstract: The 25 mm thick Ti-5111 alloy plates were achieved by hot rolling in the a+β field. The effect of different heat treatments on microstructure and mechanical properties of the Ti-5111 titanium alloy plates were investigated. The results show that, the microstructure is typical equiaxed structure when annealing at 800 ℃, and bimodal structure at 950 ℃, Widmanstatten at 1 000 ℃. An excellent balance of high strength and good toughness is realized after heat treated at 950 ℃, and the tensile strength, yield strength, elongation and impact toughness can achieve 870 MPa, 775 MPa, 14% and 81J, respectively. The fracture morphologies of Ti-5111 alloy plates which heat-treated at different temperatures were analyzed, and the influence factors for toughness were discussed. It is found that the impact toughness of Ti-5111 alloy plate is related to the type of microstructure. The impact toughness of sample with dual microstructure is the best, that with Widmanstatten microstructure is the second, and that with equiaxed microstructure is the worst. The properties of sample as-welded are equivalent to the properties of the base plate, which shows excellent weldability.
关键词: Ti-5111合金；组织；韧性；焊接性能
Keywords: Ti-5111 titanium alloy；microstructure；toughness；weldability
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