摘要
在混合元素法激光立体成形(LSF)过程中,由于各种纯金属粉末或中间合金的密度、粒度不同,使得不同种的粉末输送性不同,即粉末离开送粉管后形成的粉末流的发散角,或粉斑直径不同,造成不同粉末进入熔池的比例与原始粉末配比不同,进而使得成形后试样成分与原始粉末配比之间产生偏差,不能得到名义成分试样。本文对不同种粉末的输送性进行观察,并建立从合金名义成分出发,反推原始粉末配比的实验和计算模型,并用混合元素法激光立体成形V-4Cr-4Ti合金为例对模型进行验证。
During laser solid forming from blended elemental powders process,the density and grain size of all sorts of pure metal powders or intermediate alloy powders were different,so it caused the difference of powder delivery behaviors,which could be described by divergence angle of the powder flow when they came out from the nozzle,or by powder spot diameter,resulting in the difference in composition between the laser deposits and the premixed element powders,the nominal component can not be gotten.All powder delivery behaviors were obtained,and a model that calculated the proportion of premixed element powders from the nominal component was established,and then the model was verified by laser solid forming V-4Cr-4Ti alloy experiment.
出处
《热加工工艺》
CSCD
北大核心
2012年第18期21-23,共3页
Hot Working Technology
基金
西北工业大学基础研究基金项目(GBKY1012)
凝固技术国家重点实验室博士后基金项目(01-BZ-2010)
凝固技术国家重点实验室自主课题(68-QP-2010)
"973"国家重点基础研究发展计划项目(2011CB610402)
关键词
混合元素法
激光立体成形
粉末配比
blended elemental powders
laser solid forming
powder proportion
