首页|选区激光熔化成形2%TiBw/TA15复合材料的显微组织与性能

选区激光熔化成形2%TiBw/TA15复合材料的显微组织与性能

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本文通过选区激光熔化成形技术(Selective laser melting,SLM)制备原位自生2%(体积分数)TiBw/TA15钛基复合材料,探究激光功率和扫描速率对该复合材料的显微组织和室温/高温力学性能的影响规律,并揭示其强化机理.结果表明:SLM-2%TiBw/TA15复合材料中存在孔隙缺陷,其数量随激光功率的降低和扫描速率的增大而增加.该复合材料基体由一定生长方向的原始柱状β晶和细小层片状α相组成,TiB晶须呈弥散分布;其抗拉强度随激光功率的增大而减小,随扫描速率的增大而增大,最高室温抗拉强度为1337.8 MPa,与SLM-TA15合金相比提高了15.1%;600℃抗拉强度最高值为651.1 MPa,与SLM-TA15合金相比提高了10.1%.复合材料的维氏硬度最高为403.21HV,显著高于SLM-TA15合金(345.3HV).该复合材料强度提升的主要强化机制为载荷传递强化、热错配强化和细晶强化.
Microstructure and mechanical properties of 2%TiBw/TA15 composite formed by selected laser melting
In this paper,selective laser melting(SLM)was used to prepare in situ 2%TiBw/TA15 titanium matrix composites in this work,the influences of laser power and scanning speed on the microstructure,room-temperature and high-temperature mechanical properties were studied,and the strengthening mechanism was revealed.The results show that there exist keyholes in the 2%TiBw/TA15,the number of which increases with the decrease of laser power and the increase of scanning speed.2%TiBw/TA15 is composed of the original β columnar grains and fine lamellar α phase.TiB whisker disperse.Tensile performance test shows that the tensile strength of 2%TiBw/TA15 decreases with the increase of laser power and increases with the increase of scanning speed.The maximum tensile strength of 2%TiBw/TA15 at room temperature is 1337.8 MPa,is 15.1%higher than that of SLM-TA15 alloy.The highest 600℃tensile strength is 651.1 MPa,which is 10.1%higher than SLM-TA15 alloy.The highest Vickers hardness of the composite is 403.21HV,which is significantly higher than that of SLM-TA15(345.3HV).The main strengthening mechanisms of 2%TiBw/TA15 composite are load transfer strengthening,thermal mismatch strengthening and grain refinement strengthening.

TiBw/TA15 compositeselective laser meltingmicrostructuremechanical propertystrengthening mechanism

贾畅颖、安琦、王存玉、张芮、崔丽华、陈润、孙枫泊、黄陆军、耿林

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哈尔滨工业大学 材料科学与工程学院,哈尔滨 150000

TiBw/TA15复合材料 选区激光熔化 显微组织 力学性能 强化机理

国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金黑龙江省头雁团队计划黑龙江省自然科学基金

2022YFB37074055237113552201156U22A20113TD2020E001

2024

10.11817/j.ysxb.1004.0609.2023-44391

中国有色金属学报
中国有色金属学会

中国有色金属学报

CSTPCD北大核心
影响因子：1.108
ISSN：1004-0609
年,卷(期)：2024.34(4)
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