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含Fe钛合金的偏析现象及预防措施
Segregation Phenomenon and Preventive Measures of Titanium Alloys Containing Fe
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- DOI:
- 作者:
- 刘志成1，张利军2，刘 娣2，米 磊2，韩 彤2，侯林涛2
LIU Zhicheng1, ZHANG Lijun2, LIU Di2, MI Lei2, HAN Tong2, HOU Lintao2
- 作者单位:
- 1. 空装驻天津地区第三军事代表室，天津300308；2.陕西省先进金属结构材料精确热成形重点实验室，陕西西安710200
1. The Third Military Representative Office in Tianjin, Tianjin 300308, China; 2. Shaanxi Key Laboratory of Advanced Metal Structural Materials Precision Thermoforming, Xi'an 710200, China
- 关键词:
- 钛合金；低倍组织异常；偏析；熔炼
titanium alloy; abnormal macrostructure; segregation; smelting
- 摘要:
- 在工业化生产过程中，含Fe钛合金锻件时常会出现低倍组织异常。 采用光学显微镜(OM)、能谱分析(EDS) 以及ICP光谱分析仪等对TB6、TC18等含Fe钛合金的异常低倍组织进行了研究。 结果表明，TB6合金棒材1/2半径至 中心区域亮斑、TC18合金棒材头部中心区域暗斑均为铸锭熔炼过程中形成的Fe元素富集偏析。 进一步分析表明，Fe 元素偏析是溶质分配系数k0 <1所致。 在铸锭生产过程中采用较小熔炼电流、缩短补缩时间、控制稳弧电流的方式可有 效预防Fe元素偏析。The abnormal macrostructure of titanium forgings containing Fe is common in production. The abnormal macrostructures of the multicomponent titanium alloys TB6 and TC18 were studied via optical microscope (OM), energy spectrum analysis (EDS), ICP spectral analysis, etc. The results reveals that the bright spots in the region from the 1/2 radius to the center of the TB6 alloy bar, and the dark spots in the central area of the head of the TC18 alloy bar are both Fe enrichment segregations formed during the ingot melting process. Further analysis reveals that Fe segregation is caused by the solute partition coefficient k0 <1. The Fe segregation in the production process of the ingot can be effectively prevented by adopting a lower melting current, shortening the feeding time, and controlling the arc-stabilizing current.