熔炼工艺对TC6铸锭成分均匀性及β斑偏析规律的影响  

Effect of the Melting Process on the Composition Uniformity andβFleck Segregation of the TC6 Alloy

作　　者：李欣琳 张天有 邢学伟 韩呈祥 张英明[1] 郭金明[1] LI Xinlin;ZHANG Tianyou;XING Xuewei;HAN Chengxiang;ZHANG Yingming;GUO Jinming(Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《铸造技术》2025年第3期288-295,共8页Foundry Technology

摘　　要：TC6合金具有中强、韧性好、热强性好等优异的综合性能,在航空航天发动机等领域有着广泛的应用。为了制备出成分均匀、无β斑产生的TC6合金铸锭,以小颗粒海绵钛、中间合金和单质金属为原料,通过真空自耗电弧熔炼制备了3 t级TC6合金铸锭(Ti-6.3Al-2.5Mo-1.65Cr-0.5Fe-0.3Si),研究了不同熔炼次数、不同稳弧电流及原料种类对合金铸锭成分均匀性及显微组织的影响。结果表明,选用二元中间合金为原料,稳弧电流为15 A/30 s时合金铸锭整体化学成分均匀,Cr元素范围为1.53%~1.56%(质量分数),铸锭组织中无β斑产生;选用金属单质为原料,熔炼次数为2次,稳弧电流为9 A/30 s时铸锭成分波动较大,Cr元素范围为1.55%~1.66%(质量分数),铸锭中存在富Cr和Fe、贫Mo的β斑。实际生产中应通过合理的熔炼工艺制备出整体成分均匀,无β斑的TC6铸锭。TC6 alloys have excellent comprehensive properties,such as medium strength,good toughness and good thermal strength,and have been widely used in aerospace engines and other fields.To prepare a TC6 alloy ingot with a uniform composition and noβfleck,a 3 t grade TC6 alloy ingot(Ti-6.3Al-2.5Mo-1.65Cr-0.5Fe-0.3Si)was prepared via vacuum consumable arc melting using a small particle titanium sponge,intermediate alloy and elemental metal as raw materials.The effects of different melting times,arc stabilizing currents and raw materials on the composition uniformity and microstructure of alloy ingots were studied.The results show that when the binary intermediate alloy is used as the raw material and the arc stabilizing current is 15 A/30 s,the whole chemical composition of the ingot is uniform,the Cr content ranges from 1.53 wt.%to 1.56 wt.%,and noβfleck exists in the structure of the ingot.When the arc stabilizing current is 9 A/30 s,the composition of the ingot fluctuates greatly,and the Cr element ranges from 1.55 wt.%to 1.66 wt.%.There areβflecks rich in Cr and Fe and poor in Mo in the ingot.A TC6 ingot with a uniform composition and noβfleck should be prepared via a reasonable melting process during actual production.

关 键 词：TC6 成分均匀性 真空自耗电弧熔炼 β斑 

分 类 号：TG146.23[一般工业技术—材料科学与工程]