置氢TC21钛合金粉末模压成形烧结组织性能研究

采用置氢TC21钛合金粉末模压成形+保护气氛烧结工艺,研究置氢TC21钛合金粉末模压成形-烧结合金的组织性能的变化规律.结果表明:置氢量0.22%(质量分数,下同)和0.39%的TC21粉末烧结体组织较细,致密化程度也较高,置氢量0.39%的TC21粉末烧结体退火后的抗压强度和屈服强度最高.随着置氢量的增加,置氢TC21钛合金粉末模压成形烧结体片层组织尺寸变薄、针状的组织变细,晶粒尺寸变小;置氢TC21钛合金粉末模压成形烧结体退火后组织较退火前发生了明显的均匀化和细化;烧结体真空退火后氢含量达到安全状态,其中,置氢量0.39%的TC21钛合金粉末烧结体致密效果较好、综合力学性能较高.

Microstructure and Properties of Die Forming and Sintering of

The effect of hydrogenation on the microstructure and properties of TC21 alloy by die forming and sintering using hydrogenated powder to produce titanium alloy was researched by means of the room-temperature die forming and sintering in a protection atmosphere. The results show that the TC21 titanium sintered body using hydrogenated powder with hydrogen content of 0.39 wt% by die forming and sintering has a thinner microstructure and higher density, compression strength and compressive yield strength than the others. With hydrogen content increasing, the sheet microstructure gets thinner and finer and the grain size becomes smaller and homogeneous with safe hydrogen content. As a conclusion, the hydrogen content of 0.39wt% is the best for the TC21 titanium alloy sintered body according to the density and mechanical property.