激光增材修复Ti60钛合金显微组织及力学性能
Microstructure and Mechanical Properties of Laser Additive Repaired Ti60 Titanium Alloy
黄琪 1高旭 1刘栋 2何蓓2
作者信息
- 1. 北京航空航天大学大型金属构件增材制造国家工程实验室,北京 100191;北京航空航天大学材料科学与工程学院,北京 100191
- 2. 北京航空航天大学大型金属构件增材制造国家工程实验室,北京 100191;北京航空航天大学前沿科学技术创新研究院,北京 100191
- 折叠
摘要
对整体叶盘材料Ti60钛合金进行激光增材修复,研究其显微组织及力学性能.结果表明,热影响区组织呈现由基体区双态组织向修复区网篮组织的过渡特征,平均宽度约为900μm.修复区主要由贯穿多个沉积层的外延生长的柱状晶组成,柱状晶内为分布均匀的α相网篮组织.3个区域内均弥散分布着Ti3(Sn,Al)小平面相,尺寸相近,其形貌和含量却因制备工艺凝固速度的不同而差异明显.3个区域硬度相当.拉伸试样断口特征表明激光增材修复Ti60钛合金的断裂机制为混合型断裂,平均抗拉强度和屈服强度分别为992.4和916.6 MPa,优于Ti60钛合金锻件强度标准,断后伸长率和断面收缩率的平均值为8.5％和14.6％,与Ti60钛合金锻件标准相差不大,达到实际工程应用要求.
Abstract
The microstructure and mechanical properties of integral bladed titanium alloy Ti60 repaired by laser were studied.The results show that the heat affected zone structure presents the transition characteristics from the dual structure of the matrix area to the mesh basket structure of the repair area,and its average width is about 900 μm.The repair zone is mainly composed of columnar crystals growing epitaxially through multiple sedimentary layers,and the columnar crystals are uniformly distributed by α phase mesh basket structures.Ti3(Sn,Al)facet facies of similar size are dispersed in the structure of the three regions,but their morphology and regional content vary significantly due to the solidification speed of the preparation process.The three areas are equally hard.The fracture characteristics of tensile specimens show that the fracture mechanism of laser additive repaired Ti60 titanium alloy is mixed fracture.The average tensile strength and yield strength are 992.4 and 916.6 MPa,respectively,which are superior to the strength standard of Ti60 titanium alloy forgings.The average elongation and section shrinkage after fracture are 8.5％and 14.6％,respectively,which are similar to the standard of Ti60 titanium alloy forgings and which meet the requirements of practical engineering application
关键词
激光增材修复/Ti60钛合金/显微组织/力学性能Key words
laser additive repair/Ti60 titanium alloy/microstructure/mechanical properties引用本文复制引用
基金项目
国家科技重大专项(J2019-VII-0004-0144)
科工局重点项目(JPPT-2016-057)
出版年
2024
NETL
NSTL
万方数据