大直径钨镧合金锻造棒材性能研究  

Properties of large-diameter forged rods made from tungsten–lanthanum alloys

作　　者：淡新国 李长亮 张腾 

机构地区：[1]西安瑞福莱钨钼有限公司,西安710200

出　　处：《粉末冶金技术》2017年第2期108-112,共5页Powder Metallurgy Technology

摘　　要：采用纳米掺杂方法制备了大直径钨镧合金棒坯,通过与纯钨对比,研究了不同氧化镧质量分数的钨镧合金棒坯烧结性能以及含质量分数1.0%纳米氧化镧粉掺杂的钨镧合金锻造棒材的室温性能和高温再结晶性能。结果表明:采用质量分数1.0%、1.5%和2.0%三种含量的纳米氧化镧粉掺杂烧结后,合金掺杂分布和晶粒组织均匀,随着氧化镧含量的增高,棒坯密度逐渐降低、晶粒数逐渐越多;1.0%氧化镧粉掺杂钨镧合金棒坯经过78.7%锻造变形量后,较纯钨棒材硬度值更高,金相组织更细、更均匀,车加工后车削较长,表面光洁度较高,再结晶温度比纯钨高约150℃。The large-diameter forged rods of pure tungsten and tungsten-lanthanum alloys were fabricated from micron-scale tungsten powders doped by nanometer-scale lanthana powders in different contents by mass, the ambient mechanical properties of the sintered billets and forged rods were characterized, and the recrystallization behaviors of pure tungsten and tungsten-lanthanum alloys doped by 1.0% lanthana by mass were investigated. The results show that, with the increase of lanthana content from 1,0%, 1.5%, to 2.0% by mass, the doped tungsten-lanthanum alloys show higher densities, greater crystal numbers, well-distributed lanthana particles, and uniform particle sizes in the matrix. After large deformation of 78.7%, the forged alloyed rods doped by 1.0% lanthana show higher harness values and finer crystal fibers in the matrix than the pure tungsten rods, as well as better machining performance, resulting in longer machined scraps, lower roughness, and higher recrystalization temperatures by -150 ℃.

关 键 词：掺杂 钨镧合金 锻造 再结晶 

分 类 号：TG319[金属学及工艺—金属压力加工]