Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test

LIU Jinhu; DING Xianfei; FENG Xin; NAN Hai

doi:10.16080/j.issn1671–833x.2019.21.072

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Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test

更新时间：2025-10-30

- Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test
- Aeronautical Manufacturing Technology Vol. 62, Issue 21, Pages: 72-78(2019)
- 作者机构：
  
  1. 中国航发北京航空材料研究院铸造钛合金技术中心,北京,100095
  2. 北京百慕航材高科技股份有限公司,北京,100094
  3. 北京市先进钛合金精密成型工程技术中心,北京,100095
- 作者简介：
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- DOI：10.16080/j.issn1671–833x.2019.21.072
  CLC：
- Published：2019
- 稿件说明：
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刘金虎，丁贤飞，冯新，南海. 基于正交试验的铸造高Nb-TiAl合金收缩率研究[J]. 航空制造技术, 2019, 62(21): 72-78.

LIU Jinhu, DING Xianfei, FENG Xin, NAN Hai. Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test. Aeronautical Manufacturing Technology, 2019, 62(21): 72-78.
刘金虎，丁贤飞，冯新，南海. 基于正交试验的铸造高Nb-TiAl合金收缩率研究[J]. 航空制造技术, 2019, 62(21): 72-78. DOI： 10.16080/j.issn1671–833x.2019.21.072.

LIU Jinhu, DING Xianfei, FENG Xin, NAN Hai. Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test. Aeronautical Manufacturing Technology, 2019, 62(21): 72-78. DOI： 10.16080/j.issn1671–833x.2019.21.072.

摘要

采用正交试验法研究了几何形状、是否受阻收缩和试样尺寸3个因素对两种高Nb-TiAl 合金熔模铸造的线收缩率的影响。结果表明：Ti–45Al–8Nb 平均线收缩率为2.12%~3.28%，Ti–48Al–7.5Nb的平均线收缩率为2.55%~3.39%，后者线收缩率更大。受阻收缩试样在非受阻方向上的线收缩率比自由收缩试样的线收缩率高出44.8%~47.7%，几何形状与尺寸对线收缩率影响较小，凝固收缩受阻情况对线收缩率影响较大。随着试样尺寸的增加，线收缩量虽然增大100%，但线收缩率逐渐减小到20%。

Abstract

The effects of geometric shape

resisted shrinkage and free shrinkage

sample size on the linear shrinkage ratio of two high Nb-TiAl alloy investment castings were investigated by orthogonal test. The results show that the average linear shrinkage ratio of Ti–45Al–8Nb is 2.12%–3.28%

and the average linear shrinkage ratio of Ti–48Al–7.5Nb is 2.55%–3.39%

and the linear shrinkage ratio of the latter is larger. The linear shrinkage ratio of the resisted shrinkage specimen in the unblocked direction is 44.8%–47.7% higher than that of the free shrinkage specimen. The geometry and size have little effect on the linear shrinkage ratio

and resistance to solidification shrinkage has a greater impact on linear shrinkage ratio. As the sample size increases

the linear shrinkage increases by 100%

but the linear shrinkage ratio gradually decreases to 20%.

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