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对海绵钛粉、电解钛粉以及氢化脱氢钛粉进行了粉末热挤压的实验研究。观察了挤压材的组织结构并测定了材料的物理机械性能。结果表明,挤压材中多数孔隙由粉末中的夹杂物造成。随加工率增加,材料的孔隙率减小。当挤压比超过一定值时,孔隙率的减小对材料的机械性能影响不大。在高于钛再结晶温度下挤压时,钛材的金相组织呈等轴晶粒形。退火以后,发现材料的晶粒长大,材料的冲击韧性与延性提高。热挤压材的机械性能主要取决于粉末的氧含量,随氧含量的增加,材料强度增高,延性与冲击韧性下降。当粉末的氧含量控制在0.15％以下时,粉末热挤压钛材的性能可达到甚至超过TA_1的标准。
The sponge titanium powder, electrolytic titanium powder and hydrogenated dehydrogenation titanium powder were subjected to hot extrusion experiment. The structure of extruded material was observed and the physical and mechanical properties of the material were measured. The results show that most of the pores in the extruded material are caused by inclusions in the powder. As the processing rate increases, the porosity of the material decreases. When the extrusion ratio exceeds a certain value, the reduction of porosity has little effect on the mechanical properties of the material. When the temperature is higher than the recrystallization temperature of titanium, the microstructure of the titanium material is equiaxed grain shape. After annealing, the grain growth of the material was found to increase the impact toughness and ductility of the material. The mechanical properties of hot extrusion material mainly depends on the oxygen content of the powder, with the increase of oxygen content, the material strength increases, ductility and impact toughness decreased. When the oxygen content of the powder is controlled below 0.15%, the performance of powder hot extrusion titanium can meet or even surpass the standard of TA_1.