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宗学文,刘文杰,高中堂,徐文博,高倩,王磊.不同铸型对钛合金微观组织及力学性能的影响[J].稀有金属材料与工程(英文),2020,49(5):1681~1688.[宗学文,liu wenjie,gao zhongtang,xu wenbo,Gao qian and wang lei.Effect of Different Molds on Microstructure and Mechanical Properties of Titanium Alloys[J].Rare Metal Materials and Engineering,2020,49(5):1681~1688.]
Effect of Different Molds on Microstructure and Mechanical Properties of Titanium Alloys
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Received:July 15, 2019  Revised:September 10, 2019
DOI:
Key words: Titanium alloy  Ceramic mold  Graphite mold  Cooling rate  Microstructure  Mechanical properties
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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宗学文,liu wenjie,gao zhongtang,xu wenbo,Gao qian and wang lei  
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Abstract:
      The effects of different casting moulds on the microstructures and mechanical properties of ZTC4 titanium alloy were studied. The effects of cooling rate, solidification rate and solidification time on the microstructures and mechanical properties of ZTC4 titanium alloy were studied by numerical simulation and experimental analysis.The results show that compared with the ceramic sample, the graphite sample has better heat dissipation effect, faster cooling speed and higher solidification speed, which makes the microstructure of the sample to be fine lath martensite alpha produced by quenching, with smaller grain size, more orientation and larger solidification thickness.The yield strength, tensile strength and hardness of the mechanical properties increased by 6.7%, 2.6% and 4.2% respectively, but the elongation and section shrinkage decreased by 37% and 34.5%, respectively. At the same time, different positions of the same mold have some influence on the cooling rate. The cooling rate at different positions of the sample is in the order of middle > bottom > top.