摘要
采用TiH_(2)粉为原料,经过成形、一次烧结可获得相对密度>95%的纯钛,其伸长率为6.67%,断面收缩率为2.97%。为提高其塑性指标,本实验以20 mm×200 mm的纯钛烧结棒为原料,采用旋锻工艺制备了5 mm的纯钛棒材。经检测得知退火态棒材的抗拉强度为431.26 MPa,伸长率为26%,断面收缩率为38.53%,塑性指标较烧结棒提高70%以上,但略低于外购退火态纯钛锻棒力学性能。烧结钛材在旋锻过程中受到三向压应力,烧结坯中存在的微孔孔隙及微裂纹不容易聚集扩展成为宏观裂纹,且易随两向压缩一向延伸的变形方式变为危害较小的线缺陷,材料塑性得到显著提高。
Using TiH_(2) powder as raw material,pure titanium with relative density more than 95%can be obtained through forming and one-step sintering.The elongation is 6.67%and reduction of area is 2.97%.In order to improve its plasticity index,the pure titanium bar with diameter of 5mm was prepared by rotary forging from the sintered bar with diameter of 20 mm×200 mm.The tensile strength,elongation and area reduction of the annealed bar were 431.26 MPa,26%and 38.53%respectively.The plasticity index of the annealed bar was 70%higher than that of the sintered bar,but slightly lower than that of the purchased annealed bar.Rotary forging provides a strong three-dimensional compressive stress.The micro pores and micro cracks in the sintered billets are not easy to gather and expand into macro cracks,and the deformation mode which extends along with the two-way compression is easy to become less harmful line defects,and the material shaping is significantly improved.
作者
刘捷
张文莉
李悦熙薇
LIU Jie;ZHANG Wenli;LI Yuexiwei(Faculty of Metallurgy and Mining Engineering, Kunming Metallurgy College, Kunming 650033, China)
出处
《昆明冶金高等专科学校学报》
CAS
2021年第3期13-17,共5页
Journal of Kunming Metallurgy College
基金
云南省教育厅科学研究基金教师类项目:Ti-H粉末体系性能及其烧结致密化机理研究(2018JS552)。
关键词
TiH_(2)粉
烧结
旋锻
塑性指标
纯钛
TiH_(2) powder
sintering
rotary swaging
plasticity index
pure titanium
