选区激光熔化成形2%TiBw/TA15复合材料的显微组织与性能
Microstructure and mechanical properties of 2%TiBw/TA15 composite formed by selected laser melting
贾畅颖 1安琦 1王存玉 1张芮 1崔丽华 1陈润 1孙枫泊 1黄陆军 1耿林1
作者信息
- 1. 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150000
- 折叠
摘要
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.
Abstract
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.
关键词
TiBw/TA15复合材料/选区激光熔化/显微组织/力学性能/强化机理Key words
TiBw/TA15 composite/selective laser melting/microstructure/mechanical property/strengthening mechanism引用本文复制引用
基金项目
国家重点研发计划(2022YFB3707405)
国家自然科学基金(52371135)
国家自然科学基金(52201156)
国家自然科学基金(U22A20113)
黑龙江省头雁团队计划()
黑龙江省自然科学基金(TD2020E001)
出版年
2024
NETL
NSTL
万方数据