等离子旋转电极雾化法制备高品质Ti-6.5Al-1.4Si-2Zr-0.5Mo-2Sn合金粉末

发布时间：2018-01-23 21:21

本文关键词： 真空自耗电弧熔炼等离子旋转电极雾化法高温钛合金微观组织硅化物　出处：《材料工程》2017年10期 　论文类型：期刊论文

【摘要】：旨在制备高品质Ti-6.5Al-1.4Si-2Zr-0.5Mo-2Sn粉末,为后续粉末高温钛合金构件的制备奠定基础。首先采用真空自耗电弧熔炼(VAR)技术制备Ti-6.5Al-1.4Si-2Zr-0.5Mo-2Sn合金铸锭,对铸锭进行化学成分检测,并分析其合金元素损耗、成分均匀性以及显微组织和物相组成。利用制得棒料,采用等离子旋转电极雾化法(PREP),选取不同转速制备得到钛合金粉末,将粉末筛分成不同粒度范围。研究了棒料转速与粉末理化性能间的关系。采用X射线衍射分析仪(XRD)、扫描电镜(SEM)、金相显微镜(OM)分别分析了粉末的物相组成、形貌和微观组织。研究表明:通过独特的压制电极设计,可制得成分均匀、元素损耗小的钛合金铸锭,且各合金元素含量满足国标的要求。铸锭微观组织为层片状结构,基体中存在少量大小不均的Ti5Si3硅化物相。PREP法制得的钛合金粉末呈正态分布,且球形度好,无空心球和卫星球。随着转速增加,小颗粒粉末占比增加,大颗粒粉末占比大幅度降低。粉末颗粒以胞状组织为主,存在少量的枝晶。合金粉末主要由α′马氏体相组成。相比合金铸锭,粉末中各合金元素略有损耗,O元素质量分数小于0.1%,有利于制得高性能的粉末钛合金。
[Abstract]:The aim of this paper is to prepare high quality Ti-6.5Al-1.4Si-2Zr-0.5Mo-2Sn powder. It lays a foundation for the preparation of powder superalloy components. Firstly, vacuum consumable arc melting (VARs) is used. The Ti-6.5Al-1.4Si-2Zr-0.5Mo-2Sn alloy ingot was prepared by the technology. The chemical composition of the ingot was tested, and the loss of alloy elements, composition uniformity, microstructure and phase composition of the ingot were analyzed. The bar was prepared by plasma rotating electrode atomization method (PREP). The titanium alloy powder was prepared at different rotational speeds, and the powder sieve was divided into different particle size ranges. The relationship between the rotation speed of the bar and the physical and chemical properties of the powder was studied. The X-ray diffraction analyzer (XRD) was used. The phase composition, morphology and microstructure of the powder were analyzed by scanning electron microscope (SEM) and metallographic microscope (OM). Titanium alloy ingot with low loss of elements, and the elements content of each alloy meet the requirements of the national standard. The microstructure of the ingot is lamellar. There are a small amount of Ti5Si3 silicide phase. The titanium alloy powder prepared by prep method has normal distribution and good sphericity. There is no hollow sphere or satellite ball. With the increase of rotational speed. The fraction of small particle powder increased, and the proportion of large particle powder decreased significantly. The powder particles mainly consisted of cellular structure and a small amount of dendrite. The alloy powder was mainly composed of 伪 'martensite phase and compared with alloy ingot. The loss of O element in the powder is less than 0.1, which is beneficial to the preparation of the powder titanium alloy with high performance.
【作者单位】：昆明理工大学材料科学与工程学院;广东省科学院广东省材料与加工研究所;西北有色金属研究院生物材料工程研究所;
【基金】：国家自然科学基金资助项目(51504072) 广州市对外科技合作专项(2014J4500024) 广东省国际合作专项(2014B050503003) 广东省自然科学基金-博士启动专项(2015A030310193) 广东省前沿与关键技术创新专项(2015B010122004) 广东省科学院创新平台能力提升专项(2016GDASPT-0209,2016GDASPT-0102) 广州市科创委创新平台建设与共享专项(201509010003) 广东省公益研究与能力建设专项(2017A070702019) 广州市产学研协同创新专项(201604040006)
【分类号】：TF123.23
【正文快照】： 邝泉波1,2,邹黎明2,蔡一湘2,刘辛2,程军3,易健宏1(1昆明理工大学材料科学与工程学院,昆明650093;2广东省科学院广东省材料与加工研究所,广州510650;3西北有色金属研究院生物材料工程研究所,西安710016)KUANG Quan-bo1,2,ZOU Li-ming2,CAI Yi-xiang2,LIU Xin2,CHENG Jun3,YI Ji

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