冷坩埚定向凝固Ti44Al6Nb合金的组织演变规律

陈瑞润; 王纪超; 马腾飞; 郭景杰; 丁宏升; 苏彦庆; 傅恒志

doi:10.3724/SP.J.1037.2013.00550

金属学报 >

2013 , Vol. 49 >Issue 11: 1356 - 1362

DOI: https://doi.org/10.3724/SP.J.1037.2013.00550

论文

冷坩埚定向凝固Ti44Al6Nb合金的组织演变规律

陈瑞润 ,
王纪超 ,
马腾飞 ,
郭景杰 ,
丁宏升 ,
苏彦庆 ,
傅恒志

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1) 哈尔滨工业大学材料科学与工程学院, 哈尔滨150001
^{2) 中船重工天津修船技术研究所, 天津300456}

陈瑞润, 男, 1975年出生, 副教授

收稿日期: 2013-09-04

修回日期: 2013-09-24

网络出版日期: 2013-11-11

基金资助

国家重点基础研究发展计划项目2011CB605504和新世纪优秀人才支持计划项目NCET－12－0153及国家自然科学基金项目51274076资助

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MICROSTRUCTURE EVOLUTION OF Ti44Al6Nb ALLOY DIRECTIONALLY SOLIDIFIED WITH COLD CRUCIBLE

CHEN Ruirun ,
WANG Jichao ,
MA Tengfei ,
GUO Jingjie ,
DING Hongsheng ,
SU Yanqing ,
FU Hengzhi

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1) School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001
2) Tianjin Repair Technology Research Institute, CSIC, Tianjin 300456

Received date: 2013-09-04

Revised date: 2013-09-24

Online published: 2013-11-11

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摘要

利用无污染的电磁冷坩埚进行定向凝固, 对大尺寸Ti44Al6Nb (原子分数, %)定向合金锭进行研究,研究了抽拉速率和加热功率对合金表面质量、固/液界面形态、枝晶形态以及相选择的影响.结果表明, 随抽拉速率降低和功率增大, 铸锭表面质量提高,它们通过改变熔体过热度和糊状区体积而影响铸锭的表面质量; 随抽拉速率增加,凝固界面变凹, 且晶粒宽度变大, 抽拉速率超过临界值后,柱状晶不能连续生长; 随功率增加, 晶粒宽度减小; 在抽拉速率较低或功率较高时,易发生CET转变; 抽拉速率为0.5 mm/min时的初始凝固相为α相, 其它抽拉速率下初始凝固相为β相.

关键词： Ti44Al6Nb合金; 冷坩埚; 定向凝固; 微观组织

本文引用格式

陈瑞润 , 王纪超 , 马腾飞 , 郭景杰 , 丁宏升 , 苏彦庆 , 傅恒志 . 冷坩埚定向凝固Ti44Al6Nb合金的组织演变规律[J]. 金属学报, 2013 , 49(11) : 1356 -1362 . DOI: 10.3724/SP.J.1037.2013.00550

Abstract

Ti44Al6Nb (atomic fraction, %) ingots with industry size were directionally solidified without contamination with electromagnetic cold crucible. Effects of pulling rates and powers on the surface quality, the S/L interface, grain morphology and phase selection were studied. The results show that the surface quality are improved by decreasing pulling rate or increasing power, they influence the surface quality by changing the superheat degree of the melt or the volume of the mushy zone. The S/L interface becomes concave and the grain width becomes big with increasing of pulling rate, the columnar grains grow discontinuously when the pulling rate is increased. The grain width decreases with the increase of the power. Columnar grain to equiaxed grain transition (CET) is easy to occurred when the pulling rate is lower or the power is higher. At the beginning of solidification, the initial phase is αphase when the pulling rate is 0.5 mm/min, whereas, it is β phase when the pulling rates are others.

Key words： Ti44Al6Nb alloy; cold crucible; directional solidification; microstructure

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