Nb/Ti比对铸造镍基高温合金长期时效组织演化的影响<sup>*</sup>

doi:10.3724/SP.J.1037.2014.00040

金属学报

2014, Vol. 50

Issue (6): 744-752 DOI: 10.3724/SP.J.1037.2014.00040

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Nb/Ti比对铸造镍基高温合金长期时效组织演化的影响^*

孙文^1,², 秦学智², 郭永安², 郭建亭², 楼琅洪², 周兰章²

1 中国科学技术大学, 合肥 230022
2 中国科学院金属研究所, 沈阳 110016

EFFECTS OF Nb/Ti RATIOS ON THE MICROSTRUCTURAL EVOLUTIONS OF CAST Ni-BASED SUPERALLOYS DURING LONG-TERM THERMAL EXPOSURE

SUN Wen^1,², QIN Xuezhi², GUO Yongan², GUO Jianting², LOU Langhong², ZHOU Lanzhang²

1 University of Science and Technology of China, Hefei 230022
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

孙文, 秦学智, 郭永安, 郭建亭, 楼琅洪, 周兰章. Nb/Ti比对铸造镍基高温合金长期时效组织演化的影响^*[J]. 金属学报, 2014, 50(6): 744-752.
Wen SUN, Xuezhi QIN, Yongan GUO, Jianting GUO, Langhong LOU, Lanzhang ZHOU. EFFECTS OF Nb/Ti RATIOS ON THE MICROSTRUCTURAL EVOLUTIONS OF CAST Ni-BASED SUPERALLOYS DURING LONG-TERM THERMAL EXPOSURE[J]. Acta Metall Sin, 2014, 50(6): 744-752.

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摘要:

采用OM, SEM和TEM等手段, 分析了Nb/Ti 比对铸造镍基高温合金长期时效微观组织演化的影响. 结果表明, 在长期时效期间, Nb/Ti 比对γ'相形貌演化和粗化影响不大, 但对γ'相体积分数有一定影响. 初生MC中Nb/Ti 比和(Nb+Ti)/(W+Mo) 比与合金Nb/Ti 比具有很好的线性关系. 随合金Nb/Ti 比下降, 2 个比值线性下降, 使MC分解程度提高, 热稳定性降低; 但是, 2 个比值的显著改变并不能导致MC分解程度的大幅变化, 还存在其它因素对MC热稳定性具有重要影响. MC的分解程度可通过分解前后体积分数的变化来计算, 而热稳定性强弱则可由分解程度来定量表达. Nb/Ti 比降低, 晶界粗化更加严重, 晶界析出M₂₃C₆的倾向增大, 析出M₆C的倾向减小. 但是, 合金中μ相的析出演化行为并未受到Nb/Ti 比的明显影响.

关键词 ：铸造镍基高温合金, Nb/Ti比, 长期时效, 组织演化

Abstract：

Effects of Nb/Ti ratios on the microstructural evolutions of cast Ni-based suerpalloys during long-term thermal exposure are investigated by OM, SEM and TEM. The results show that Nb/Ti ratios have no influence on the evolution of γ? morphology and size during long-term thermal exposure. However, with decrease of Nb/Ti ratios in alloys, the volume fraction of γ? phase increases. Both parameters Nb/Ti and (Nb+Ti)/(W+Mo) of primary MC have a good linear relationship with Nb/Ti ratios in alloys. With decrease of Nb/Ti ratios in alloys, both parameters for primary MC linearly decrease and sequentially thermal stability of primary MC is weakened. However, the results also show that Nb/Ti and (Nb+Ti)/(W+Mo) ratios of primary MC are not the principle factors determining the thermal stability of primary MC. The degeneration degree of primary MC can be calculated by the volume fraction of primary MC before and after degeneration, while the thermal stability of primary MC can be quantitatively characterized by degeneration degree of primary MC. Furthermore, with decreased Nb/Ti ratios in alloys, the grain boundaries coarsen more severely during long-term thermal exposure. Meanwhile, precipitation tendency of M₂₃C₆ carbide on grain boundaries increases and that of M₆C carbide on grain boundaries decreases. However, the precipitation and evolution of μ phase during long-term thermal exposure is not affected by Nb/Ti ratios obviously.

Key words： cast Ni-based superalloy Nb/Ti ratio long-term exposure microstructural evolution

收稿日期: 2014-01-17

ZTFLH:

TA211.8

基金资助:* 国家自然科学基金青年科学基金资助项目51001101

作者简介: null

孙文, 男, 1986年生, 博士生

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链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2014.00040 或 https://www.ams.org.cn/CN/Y2014/V50/I6/744

表1 实验合金成分

图1 合金试样 (A0) 的典型热处理态组织

图2 3个试样中γ?相在时效不同时间后的SEM像

图3 γ?相尺寸和体积分数随时效时间的变化

图4 MC中Nb/Ti和(Ti+Nb)/(W+Mo)比与合金Nb/Ti比的关系

表2 热处理后初生MC的化学成分

图5 时效不同时间后3个试样中MC分解的SEM像

图6 MC分解程度D随时效时间t的变化曲线

图7 晶界在时效不同时间后的SEM像

图8 试样A4中μ相在时效不同时间后的SEM像

图9 μ相的体积分数随时效时间的变化

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