粉末冶金技术2024，Vol.42Issue(6)：600-608,651,10.DOI:10.19591/j.cnki.cn11-1974/tf.2022120007
电子束选区熔化W‒B合金的显微组织和力学性能
Microstructure and mechanical properties of W‒B alloys prepared by selective electron beam melting
游亮 1王建 2杨广宇2
作者信息
- 1. 东北大学材料科学与工程学院,沈阳 110819||西北有色金属研究院金属多孔材料国家重点实验室,西安 710016
- 2. 西北有色金属研究院金属多孔材料国家重点实验室,西安 710016
- 折叠
摘要
Abstract
To solve the problem of grain coarseness in pure tungsten prepared by selective electron beam melting(SEBM),B was selected as the grain refinement element.The influence of forming process parameters on the densification,microstructure,and mechanical properties of the W‒B alloys was investigated.It is found that when the electron beam current intensity is 15 mA,the scanning speed is 300 mm·s‒1,and the volume energy density is 1200 J·mm‒3,the density of W‒B alloy samples is the highest,the pores and unfused powders are the least,and the microcracks are basically suppressed.The constitutional undercooling caused by element B effectively refines the grain size of W formed by SEBM,and the microstructure changes from coarse columnar crystal to fine columnar dendrites with an average size of～8.26 μm.The highest hardness of the W‒B alloys is HV 672,and the highest ultimate compressive strength is 1598 MPa.The fracture mechanism is mainly cleavage fracture.关键词
电子束选区熔化/W-B合金/成分过冷/晶粒细化Key words
selective electron beam melting/W-B alloys/constitutional undercooling/grain refinement分类
矿业与冶金引用本文复制引用
游亮,王建,杨广宇..电子束选区熔化W‒B合金的显微组织和力学性能[J].粉末冶金技术,2024,42(6):600-608,651,10.
